diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..f5427fc
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,9 @@
+# Redis (requires redis extra)
+REDIS_URI=redis://localhost:6379
+
+# MinIO (requires minio extra)
+MINIO_ENDPOINT=localhost:9000
+MINIO_ACCESS_KEY=minioadmin
+MINIO_SECRET_KEY=minioadmin
+MINIO_BUCKET=my-bucket
+MINIO_SECURE=false
diff --git a/README.md b/README.md
index 780473f..45593f9 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,40 @@ Requires Redis with the RedisJSON module (e.g. redis-stack).
 | `MINIO_ACCESS_KEY`   | Access key                                  |
 | `MINIO_SECRET_KEY`   | Secret key                                  |
 | `MINIO_BUCKET`       | Bucket name (created on connect if missing) |
+| `MINIO_SECURE`       | Use HTTPS (`true`/`false`; default: `true`) |
+
+Copy [`.env.example`](.env.example) to `.env` for local development. `RedisConfig.from_env()` and `MinioConfig.from_env()` load `.env` automatically when resolving configuration from the environment.
+
+## Configuration injection
+
+Adapters accept optional `config` and `client` keyword arguments for explicit setup and testing:
+
+```python
+from python_repositories import RedisAdapter, RedisConfig, MinioAdapter, MinioConfig
+
+redis = RedisAdapter(config=RedisConfig(uri="redis://localhost:6379"))
+minio = MinioAdapter(
+    config=MinioConfig(
+        endpoint="localhost:9000",
+        access_key="minioadmin",
+        secret_key="minioadmin",
+        bucket="my-bucket",
+        secure=False,
+    )
+)
+```
+
+When both `config` and `client` are provided, `connect()` skips client creation (the caller owns the client lifecycle). `config` is required whenever `client` is injected.
+
+Load a `.env` file explicitly:
+
+```python
+from python_repositories import load_dotenv
+
+load_dotenv()  # optional — from_env() also loads .env by default
+```
+
+Calling `RedisAdapter()` or `MinioAdapter()` with no arguments still loads configuration from environment variables (and `.env` if present).
 
 ## Quick start
 
@@ -93,9 +127,12 @@ from python_repositories import (
     ConnectionAwareInterface,
     ContextAwareInterface,
     JsonRepositoryInterface,
+    MinioAdapter,
+    MinioConfig,
     ObjectRepositoryInterface,
     RedisAdapter,
-    MinioAdapter,
+    RedisConfig,
+    load_dotenv,
 )
 ```
 
@@ -104,9 +141,13 @@ from python_repositories import (
 ```bash
 uv sync --all-extras
 uv run pre-commit install   # once per clone — runs hooks on git commit
-uv run pytest tests/integration/ -v
+uv run pytest tests/unit/ -v                          # fast, no Docker
+uv run pytest -m "not integration" -v                 # all non-Docker tests
+uv run pytest -v                                      # full suite (requires Docker)
 ```
 
+Integration tests are marked with `@pytest.mark.integration` and require Docker (testcontainers). Run unit tests alone for quick local feedback.
+
 `pre-commit` is included in the dev dependency group. `uv sync` installs the CLI, but git does not run hooks until you install them with `pre-commit install` (one time per clone). After that, commits run the checks defined in [`.pre-commit-config.yaml`](.pre-commit-config.yaml) (ruff, mypy, pyupgrade, prettier, and general file hygiene).
 
 To run all hooks manually without committing:
@@ -115,8 +156,6 @@ To run all hooks manually without committing:
 uv run pre-commit run --all-files
 ```
 
-Integration tests require Docker (testcontainers).
-
 ## Releases
 
 Releases are automated when a pull request is merged to `main`. CI reads the **merged PR title** to decide whether and how to bump the version.
diff --git a/pyproject.toml b/pyproject.toml
index 4dd505e..df95b65 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 dependencies = [
+    "python-dotenv>=1.0.0",
     "python-utils>=0.1.0",
     "structlog>=25.4.0",
 ]
@@ -33,6 +34,10 @@ build-backend = "hatchling.build"
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 pythonpath = ["."]
+addopts = "--import-mode=importlib"
+markers = [
+    "integration: tests requiring Docker containers (deselect with '-m \"not integration\"')",
+]
 
 [tool.uv.sources]
 python-utils = { index = "gitea" }
diff --git a/python_repositories/__init__.py b/python_repositories/__init__.py
index dfdd8d4..7828124 100644
--- a/python_repositories/__init__.py
+++ b/python_repositories/__init__.py
@@ -6,6 +6,7 @@ from typing import TYPE_CHECKING
 
 # Interfaces are always available; they have no optional backend dependencies.
 from . import adapters
+from .config import MinioConfig, RedisConfig, load_dotenv
 from .interfaces import (
     ConnectionAwareInterface,
     ContextAwareInterface,
@@ -22,7 +23,10 @@ __all__ = [
     "ConnectionAwareInterface",
     "ContextAwareInterface",
     "JsonRepositoryInterface",
+    "MinioConfig",
     "ObjectRepositoryInterface",
+    "RedisConfig",
+    "load_dotenv",
     *adapters.__all__,
 ]
 
diff --git a/python_repositories/adapters/minio_adapter.py b/python_repositories/adapters/minio_adapter.py
index bf2d34e..02775af 100644
--- a/python_repositories/adapters/minio_adapter.py
+++ b/python_repositories/adapters/minio_adapter.py
@@ -1,14 +1,12 @@
 """Definition of MinioAdapter class."""
 
 from __future__ import annotations
-import os
 from io import BytesIO
 
-from python_utils import check_env
-
 from python_repositories.adapters.connection_aware_adapter import (
     ConnectionAwareAdapter,
 )
+from python_repositories.config import MinioConfig
 from python_repositories.interfaces import ObjectRepositoryInterface
 
 try:
@@ -27,63 +25,78 @@ class MinioAdapter(ObjectRepositoryInterface, ConnectionAwareAdapter):
     access_key_env_var_name: str = "MINIO_ACCESS_KEY"
     secret_key_env_var_name: str = "MINIO_SECRET_KEY"
     bucket_env_var_name: str = "MINIO_BUCKET"
+    secure_env_var_name: str = "MINIO_SECURE"
     chunk_size: int = 5 * 2**20  # 5 MiB
     connection_name: str = "Minio"
 
-    def __init__(self) -> None:
+    def __init__(
+        self,
+        *,
+        config: MinioConfig | None = None,
+        client: minio.Minio | None = None,
+    ) -> None:
         super().__init__()
-        check_env(
-            {
+        if config is None:
+            if client is not None:
+                raise ValueError("config is required when client is provided")
+            config = MinioConfig.from_env(
                 self.endpoint_env_var_name,
                 self.access_key_env_var_name,
                 self.secret_key_env_var_name,
                 self.bucket_env_var_name,
-            },
-        )
-        self._client: minio.Minio | None = None
-        self._bucket_name: str | None = None
+                self.secure_env_var_name,
+            )
+        self._config = config
+        self._client_injected = client is not None
+        self._client: minio.Minio | None = client
+        self._bucket_name: str | None = config.bucket if client is not None else None
+        if self._client_injected:
+            self._invalidate_health_cache()
 
     def _is_client_ready(self) -> bool:
         return self._client is not None and self._bucket_name is not None
 
     def connect(self) -> None:
         """Connect to the Minio server."""
+        if self._client_injected:
+            if self._client is not None:
+                try:
+                    _ = self._client.list_buckets()
+                except Exception as exc:  # pylint: disable=broad-except
+                    raise ConnectionError(
+                        f"Could not connect to Minio at {self._config.endpoint}"
+                    ) from exc
+            self._invalidate_health_cache()
+            return
         if self._client is not None and self.is_connected():
             self.logger.info("Already connected to Minio")
             return
         if self._client is not None:
             self.disconnect()
-        # Prepare arguments
-        endpoint = str(os.getenv(self.endpoint_env_var_name))
-        access_key = str(os.getenv(self.access_key_env_var_name))
-        secret_key = str(os.getenv(self.secret_key_env_var_name))
-        bucket = str(os.getenv(self.bucket_env_var_name))
-        # Connect client
+        endpoint = self._config.endpoint
+        access_key = self._config.access_key
+        secret_key = self._config.secret_key
+        bucket = self._config.bucket
         client = minio.Minio(
             endpoint=endpoint,
             access_key=access_key,
             secret_key=secret_key,
-            secure=False,
+            secure=self._config.secure,
         )
-        # Test the connection by listing buckets (will raise if connection fails)
         try:
             _ = client.list_buckets()
         except Exception as exc:  # pylint: disable=broad-except
             raise ConnectionError(f"Could not connect to Minio at {endpoint}") from exc
-        # Ensure bucket exists
         if not client.bucket_exists(bucket):
             self.logger.info(f"Creating bucket '{bucket}'")
             client.make_bucket(bucket)
-        # Persist information
         self._client = client
         self._bucket_name = bucket
         self._invalidate_health_cache()
 
     def disconnect(self) -> None:
         """Disconnect from the Minio server."""
-        # Close connection
-        # N.B. Minio client does not have a close method, but we include this for symmetry with other adapters
-        # Reset client
+        # N.B. Minio client does not have a close method, but we include this for symmetry
         self._client = None
         self._bucket_name = None
         self._invalidate_health_cache()
diff --git a/python_repositories/adapters/redis_adapter.py b/python_repositories/adapters/redis_adapter.py
index 6920d97..47a88a4 100644
--- a/python_repositories/adapters/redis_adapter.py
+++ b/python_repositories/adapters/redis_adapter.py
@@ -2,13 +2,11 @@
 
 from __future__ import annotations
 from typing import cast
-import os
-
-from python_utils import check_env
 
 from python_repositories.adapters.connection_aware_adapter import (
     ConnectionAwareAdapter,
 )
+from python_repositories.config import RedisConfig
 from python_repositories.interfaces import JsonRepositoryInterface
 
 try:
@@ -29,24 +27,47 @@ class RedisAdapter(JsonRepositoryInterface, ConnectionAwareAdapter):
     encoding: str = "UTF-8"
     connection_name: str = "Redis"
 
-    def __init__(self) -> None:
+    def __init__(
+        self,
+        *,
+        config: RedisConfig | None = None,
+        client: redis.Redis | None = None,
+    ) -> None:
         super().__init__()
-        check_env(self.uri_env_var_name)
-        self._client: redis.Redis | None = None
+        if config is None:
+            if client is not None:
+                raise ValueError("config is required when client is provided")
+            config = RedisConfig.from_env(self.uri_env_var_name)
+        self._config = config
+        self._client_injected = client is not None
+        self._client: redis.Redis | None = client
         self.path: str = RedisPath.root_path()
+        if self._client_injected:
+            self._invalidate_health_cache()
 
     def _is_client_ready(self) -> bool:
         return self._client is not None
 
     def connect(self) -> None:
         """Connect to the Redis server."""
+        if self._client_injected:
+            if self._client is not None:
+                try:
+                    if not self._client.ping():
+                        raise ConnectionError(
+                            f"Could not connect to Redis at {self._config.uri}"
+                        )
+                except (redis.ConnectionError, redis.TimeoutError) as exc:
+                    raise ConnectionError(
+                        f"Could not connect to Redis at {self._config.uri}"
+                    ) from exc
+            self._invalidate_health_cache()
+            return
         if self._client is not None:
             self._client.close()
             self._client = None
             self._invalidate_health_cache()
-        # Prepare arguments
-        uri = str(os.getenv(self.uri_env_var_name))
-        # Connect client
+        uri = self._config.uri
         try:
             client = redis.Redis.from_url(
                 url=uri,
@@ -56,16 +77,13 @@ class RedisAdapter(JsonRepositoryInterface, ConnectionAwareAdapter):
                 raise ConnectionError(f"Could not connect to Redis at {uri}")
         except (redis.ConnectionError, redis.TimeoutError) as exc:
             raise ConnectionError(f"Could not connect to Redis at {uri}") from exc
-        # Persist client
         self._client = client
         self._invalidate_health_cache()
 
     def disconnect(self) -> None:
         """Disconnect from the Redis server."""
-        # Close connection
-        if self._client is not None:
+        if self._client is not None and not self._client_injected:
             self._client.close()
-        # Reset client
         self._client = None
         self._invalidate_health_cache()
 
diff --git a/python_repositories/config/__init__.py b/python_repositories/config/__init__.py
new file mode 100644
index 0000000..8bd2d81
--- /dev/null
+++ b/python_repositories/config/__init__.py
@@ -0,0 +1,9 @@
+from .dotenv_loader import load_dotenv as load_dotenv
+from .minio_config import MinioConfig as MinioConfig
+from .redis_config import RedisConfig as RedisConfig
+
+__all__ = [
+    "MinioConfig",
+    "RedisConfig",
+    "load_dotenv",
+]
diff --git a/python_repositories/config/dotenv_loader.py b/python_repositories/config/dotenv_loader.py
new file mode 100644
index 0000000..ee6a91b
--- /dev/null
+++ b/python_repositories/config/dotenv_loader.py
@@ -0,0 +1,14 @@
+"""Load environment variables from a .env file."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from dotenv import load_dotenv as _load_dotenv
+
+
+def load_dotenv(path: str | Path | None = None) -> bool:
+    """Load .env into os.environ. Idempotent; returns True if a file was loaded."""
+    if path is None:
+        return bool(_load_dotenv())
+    return bool(_load_dotenv(path))
diff --git a/python_repositories/config/minio_config.py b/python_repositories/config/minio_config.py
new file mode 100644
index 0000000..0405ddb
--- /dev/null
+++ b/python_repositories/config/minio_config.py
@@ -0,0 +1,65 @@
+"""MinIO connection configuration."""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+
+from python_utils import check_env
+
+from python_repositories.config.dotenv_loader import load_dotenv
+
+_TRUTHY = frozenset({"1", "true", "yes", "on"})
+_FALSY = frozenset({"0", "false", "no", "off"})
+
+
+def _env_bool(name: str, default: bool) -> bool:
+    raw = os.getenv(name)
+    if raw is None:
+        return default
+    normalized = raw.strip().lower()
+    if normalized in _TRUTHY:
+        return True
+    if normalized in _FALSY:
+        return False
+    raise ValueError(f"Invalid boolean value for {name}: {raw!r}")
+
+
+@dataclass(frozen=True)
+class MinioConfig:
+    """Configuration for connecting to MinIO."""
+
+    endpoint: str
+    access_key: str
+    secret_key: str
+    bucket: str
+    secure: bool = True
+
+    @classmethod
+    def from_env(
+        cls,
+        endpoint_env_var_name: str = "MINIO_ENDPOINT",
+        access_key_env_var_name: str = "MINIO_ACCESS_KEY",
+        secret_key_env_var_name: str = "MINIO_SECRET_KEY",
+        bucket_env_var_name: str = "MINIO_BUCKET",
+        secure_env_var_name: str = "MINIO_SECURE",
+        *,
+        use_dotenv: bool = True,
+    ) -> MinioConfig:
+        """Load configuration from environment variables."""
+        if use_dotenv:
+            load_dotenv()
+        env_var_names = {
+            endpoint_env_var_name,
+            access_key_env_var_name,
+            secret_key_env_var_name,
+            bucket_env_var_name,
+        }
+        check_env(env_var_names)
+        return cls(
+            endpoint=str(os.getenv(endpoint_env_var_name)),
+            access_key=str(os.getenv(access_key_env_var_name)),
+            secret_key=str(os.getenv(secret_key_env_var_name)),
+            bucket=str(os.getenv(bucket_env_var_name)),
+            secure=_env_bool(secure_env_var_name, default=True),
+        )
diff --git a/python_repositories/config/redis_config.py b/python_repositories/config/redis_config.py
new file mode 100644
index 0000000..85a3050
--- /dev/null
+++ b/python_repositories/config/redis_config.py
@@ -0,0 +1,30 @@
+"""Redis connection configuration."""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+
+from python_utils import check_env
+
+from python_repositories.config.dotenv_loader import load_dotenv
+
+
+@dataclass(frozen=True)
+class RedisConfig:
+    """Configuration for connecting to Redis."""
+
+    uri: str
+
+    @classmethod
+    def from_env(
+        cls,
+        uri_env_var_name: str = "REDIS_URI",
+        *,
+        use_dotenv: bool = True,
+    ) -> RedisConfig:
+        """Load configuration from environment variables."""
+        if use_dotenv:
+            load_dotenv()
+        check_env(uri_env_var_name)
+        return cls(uri=str(os.getenv(uri_env_var_name)))
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..09b99f1
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,12 @@
+"""Shared test configuration constants."""
+
+from python_repositories.config import MinioConfig, RedisConfig
+
+TEST_REDIS_CONFIG = RedisConfig(uri="redis://localhost:6379")
+TEST_MINIO_CONFIG = MinioConfig(
+    endpoint="localhost:9000",
+    access_key="minioadmin",
+    secret_key="minioadmin",
+    bucket="test-bucket",
+    secure=False,
+)
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 933cd07..cf1e821 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -1,7 +1,6 @@
 """Integration tests configuration."""
 
 import logging
-import os
 from collections.abc import Generator
 
 import pytest
@@ -10,6 +9,7 @@ import structlog
 from minio import Minio
 from testcontainers.minio import MinioContainer
 
+from python_repositories.config import MinioConfig, RedisConfig
 from tests.integration.redis_container_test import REDIS_PORT, RedisTestContainer
 
 collect_ignore = ["redis_container_test.py"]
@@ -22,7 +22,6 @@ MINIO_BUCKET = "test-bucket"
 @pytest.fixture(scope="session", autouse=True)
 def configure_logging() -> None:
     """Configure logging for the test session."""
-    # Configure structlog
     structlog.configure(
         processors=[
             structlog.stdlib.filter_by_level,
@@ -35,40 +34,34 @@ def configure_logging() -> None:
         wrapper_class=structlog.stdlib.BoundLogger,
         cache_logger_on_first_use=True,
     )
-    # Set up basic logging configuration
     logging.basicConfig(level=logging.ERROR)
 
 
 @pytest.fixture(scope="session")
 def redis_container() -> Generator[str, None, None]:
     """Set up a Redis container for testing and yield the Redis URI."""
-    # Start container
     container = RedisTestContainer(
         image="redis/redis-stack:7.2.0-v0",
     )
     container.start()
-    # Set environment variable for Redis URI
     redis_host = container.get_container_host_ip()
     redis_port = container.get_exposed_port(REDIS_PORT)
     redis_uri = f"redis://{redis_host}:{redis_port}"
 
     yield redis_uri
 
-    # Stop container
     container.stop()
 
 
 @pytest.fixture(scope="session")
 def minio_container() -> Generator[dict[str, str], None, None]:
-    """Set up a Minio container for testing and yield the Minio URI."""
-    # Start container
+    """Set up a Minio container for testing and yield connection settings."""
     container = MinioContainer(
         image="minio/minio:latest",
         access_key=MINIO_ACCESS_KEY,
         secret_key=MINIO_SECRET_KEY,
     )
     container.start()
-    # Build environment variables dictionary
     minio_host = container.get_container_host_ip()
     minio_port = container.get_exposed_port(9000)
     minio_endpoint = f"{minio_host}:{minio_port}"
@@ -77,38 +70,35 @@ def minio_container() -> Generator[dict[str, str], None, None]:
         "MINIO_ACCESS_KEY": MINIO_ACCESS_KEY,
         "MINIO_SECRET_KEY": MINIO_SECRET_KEY,
         "MINIO_BUCKET": MINIO_BUCKET,
+        "MINIO_SECURE": "false",
     }
 
     yield env_vars
 
-    # Stop container
     container.stop()
 
 
-@pytest.fixture(scope="session", autouse=True)
-def set_environment_variables(
-    redis_container: str,
-    minio_container: dict[str, str],
-) -> Generator[dict[str, str], None, None]:
-    """Set environment variables needed for tests."""
-    # Build environment variables dictionary
-    env_vars = {"REDIS_URI": redis_container}
-    env_vars.update(minio_container)
-    # Set environment variables
-    for key, value in env_vars.items():
-        os.environ[key] = value
+@pytest.fixture(scope="session")
+def redis_config(redis_container: str) -> RedisConfig:
+    """Provide RedisConfig built from the test container."""
+    return RedisConfig(uri=redis_container)
 
-    yield env_vars
 
-    # Cleanup
-    for key in env_vars:
-        _ = os.environ.pop(key, default=None)
+@pytest.fixture(scope="session")
+def minio_config(minio_container: dict[str, str]) -> MinioConfig:
+    """Provide MinioConfig built from the test container."""
+    return MinioConfig(
+        endpoint=minio_container["MINIO_ENDPOINT"],
+        access_key=minio_container["MINIO_ACCESS_KEY"],
+        secret_key=minio_container["MINIO_SECRET_KEY"],
+        bucket=minio_container["MINIO_BUCKET"],
+        secure=False,
+    )
 
 
 @pytest.fixture(scope="session")
 def raw_redis_client(redis_container: str) -> Generator[redis.Redis, None, None]:
     """Provide a raw Redis client connected to the test Redis container."""
-    # Connect client
     client = redis.Redis.from_url(
         url=redis_container,
         socket_connect_timeout=10,
@@ -116,7 +106,6 @@ def raw_redis_client(redis_container: str) -> Generator[redis.Redis, None, None]
 
     yield client
 
-    # Cleanup
     client.flushall()
     client.close()
 
@@ -124,21 +113,18 @@ def raw_redis_client(redis_container: str) -> Generator[redis.Redis, None, None]
 @pytest.fixture(scope="session")
 def raw_minio_client(minio_container: dict[str, str]) -> Generator[Minio, None, None]:
     """Provide a raw Minio client connected to the test Minio container."""
-    # Connect client
     client = Minio(
         endpoint=minio_container["MINIO_ENDPOINT"],
         access_key=minio_container["MINIO_ACCESS_KEY"],
         secret_key=minio_container["MINIO_SECRET_KEY"],
         secure=False,
     )
-    # Ensure bucket exists
     bucket_name = minio_container["MINIO_BUCKET"]
     if not client.bucket_exists(bucket_name):
         client.make_bucket(bucket_name)
 
     yield client
 
-    # Cleanup
     objects = client.list_objects(bucket_name, recursive=True)
     for obj in objects:
         client.remove_object(bucket_name, obj.object_name)
diff --git a/tests/integration/examples_test.py b/tests/integration/examples_test.py
index 4586bcd..3ad0053 100644
--- a/tests/integration/examples_test.py
+++ b/tests/integration/examples_test.py
@@ -2,29 +2,46 @@
 
 from collections.abc import Generator
 from io import BytesIO
+import os
 import random
 
 import pytest
+
 from python_repositories.examples.artifact_object_repository import (
     ArtifactObjectRepository,
 )
 from python_repositories.examples.user_json_repository import UserJsonRepository
 
+pytestmark = pytest.mark.integration
+
+
+@pytest.fixture(scope="module", autouse=True)
+def set_example_env(
+    redis_container: str,
+    minio_container: dict[str, str],
+) -> Generator[None, None, None]:
+    """Set env vars so example repositories can use from_env() defaults."""
+    env_vars = {"REDIS_URI": redis_container, **minio_container}
+    for key, value in env_vars.items():
+        os.environ[key] = value
+    yield
+    for key in env_vars:
+        _ = os.environ.pop(key, default=None)
+
 
 @pytest.fixture(scope="module")
-def user_data() -> Generator[dict[str, str]]:
+def user_data() -> Generator[dict[str, str], None, None]:
     """Provide sample user data for tests."""
     yield {"name": "Alice", "email": "alice@example.com"}
 
 
 @pytest.fixture(scope="module")
-def artifact_data() -> Generator[BytesIO]:
+def artifact_data() -> Generator[BytesIO, None, None]:
     """Provide sample artifact data for tests."""
     yield BytesIO(random.randbytes(2**20))
 
 
 def test_user_json_repository_save_and_get(
-    redis_container: str,
     user_data: dict[str, str],
 ) -> None:
     """Test that UserJsonRepository can save and retrieve a user."""
@@ -34,7 +51,6 @@ def test_user_json_repository_save_and_get(
 
 
 def test_user_json_repository_delete(
-    redis_container: str,
     user_data: dict[str, str],
 ) -> None:
     """Test that UserJsonRepository can delete a user."""
@@ -45,7 +61,6 @@ def test_user_json_repository_delete(
 
 
 def test_artifact_object_repository_store_and_get(
-    minio_container: dict[str, str],
     artifact_data: BytesIO,
 ) -> None:
     """Test that ArtifactObjectRepository can store and retrieve an artifact."""
diff --git a/tests/integration/minio_adapter_test.py b/tests/integration/minio_adapter_test.py
index e79e157..dd4b31b 100644
--- a/tests/integration/minio_adapter_test.py
+++ b/tests/integration/minio_adapter_test.py
@@ -1,17 +1,20 @@
 """Integration tests for the MinioAdapter."""
 
 from collections.abc import Generator
-import pytest
-from unittest.mock import MagicMock
-from minio import Minio
-from io import BytesIO
-import random
-import os
 import logging
-from minio import S3Error
+import random
+from io import BytesIO
+from unittest.mock import MagicMock
+
+import pytest
+from minio import Minio, S3Error
 from urllib3.response import BaseHTTPResponse
+
 from python_repositories.adapters.minio_adapter import MinioAdapter
-from python_repositories.interfaces import ObjectRepositoryInterface
+from python_repositories.config import MinioConfig
+from tests.conftest import TEST_MINIO_CONFIG
+
+pytestmark = pytest.mark.integration
 
 
 def same_data(
@@ -19,15 +22,10 @@ def same_data(
     data_b: BytesIO,
 ) -> bool:
     """Check if two BytesIO-objects contain the same data."""
-    assert isinstance(data_a, BytesIO)
-    assert isinstance(data_b, BytesIO)
-    # prepare for being read
     data_a.seek(0)
     data_b.seek(0)
-    # convert to bytes
     data_a_bytes = data_a.read()
     data_b_bytes = data_b.read()
-    # compare size
     if len(data_a_bytes) != len(data_b_bytes):
         logging.error(
             "data has different length: %s and %s",
@@ -35,7 +33,6 @@ def same_data(
             len(data_b_bytes),
         )
         return False
-    # compare content
     if data_a_bytes != data_b_bytes:
         logging.error("data has different bytes")
         return False
@@ -45,20 +42,19 @@ def same_data(
 @pytest.fixture(scope="module")
 def data() -> Generator[BytesIO, None, None]:
     """Provide a sample data bytes for tests."""
-    # Generate random bytes
-    random_bytes = random.randbytes(2**21)  # 2 MiB
+    random_bytes = random.randbytes(2**21)
     yield BytesIO(random_bytes)
 
 
 @pytest.fixture(scope="function")
 def data_in_minio(
     raw_minio_client: Minio,
+    minio_config: MinioConfig,
     data: BytesIO,
 ) -> Generator[tuple[str, BytesIO], None, None]:
     """Fixture to set up a known value in Minio before each test."""
     object_name = "test_object"
-    bucket_name = str(os.getenv("MINIO_BUCKET"))
-    # Upload object
+    bucket_name = minio_config.bucket
     num_bytes = data.getbuffer().nbytes
     data.seek(0)
     raw_minio_client.put_object(
@@ -68,19 +64,17 @@ def data_in_minio(
         length=num_bytes,
         part_size=MinioAdapter.chunk_size,
     )
-    # Reset data for reading in tests
     data.seek(0)
 
     yield object_name, data
 
-    # Cleanup
     raw_minio_client.remove_object(bucket_name, object_name)
 
 
 @pytest.fixture(scope="module")
-def minio_adapter() -> Generator[MinioAdapter, None, None]:
+def minio_adapter(minio_config: MinioConfig) -> Generator[MinioAdapter, None, None]:
     """Fixture to provide a connected MinioAdapter instance."""
-    adapter = MinioAdapter()
+    adapter = MinioAdapter(config=minio_config)
     adapter.connect()
     yield adapter
     adapter.disconnect()
@@ -89,10 +83,10 @@ def minio_adapter() -> Generator[MinioAdapter, None, None]:
 @pytest.fixture(scope="function", autouse=True)
 def clear_minio(
     raw_minio_client: Minio,
+    minio_config: MinioConfig,
 ) -> None:
     """Fixture to clear all Minio objects before each test."""
-    bucket_name = str(os.getenv("MINIO_BUCKET"))
-    # Clear all objects before each test
+    bucket_name = minio_config.bucket
     objects = raw_minio_client.list_objects(bucket_name, recursive=True)
     for obj in objects:
         if not obj.object_name:
@@ -100,24 +94,6 @@ def clear_minio(
         raw_minio_client.remove_object(bucket_name, obj.object_name)
 
 
-def test_should_adhere_to_interface() -> None:
-    """Test that the MinioAdapter adheres to the expected interface."""
-    assert issubclass(MinioAdapter, ObjectRepositoryInterface)
-    _ = MinioAdapter()
-
-
-def test_should_have_logger_when_instantiated() -> None:
-    """Test that the MinioAdapter has a logger when instantiated."""
-    adapter = MinioAdapter()
-    assert hasattr(adapter, "logger")
-
-
-def test_should_not_be_connected_when_instantiated() -> None:
-    """Test that the MinioAdapter is not connected when instantiated."""
-    adapter = MinioAdapter()
-    assert not adapter.is_connected()
-
-
 def test_should_log_info_when_already_connected(
     minio_adapter: MinioAdapter,
     caplog: pytest.LogCaptureFixture,
@@ -128,13 +104,15 @@ def test_should_log_info_when_already_connected(
     assert "Already connected to Minio" in caplog.text
 
 
-def test_should_raise_connection_error_when_unable_to_connect(
-    monkeypatch: pytest.MonkeyPatch,
-) -> None:
+def test_should_raise_connection_error_when_unable_to_connect() -> None:
     """Test that the MinioAdapter raises a ConnectionError when unable to connect."""
-    # Arrange
-    monkeypatch.setenv("MINIO_ENDPOINT", "invalid_uri")
-    adapter = MinioAdapter()
+    config = MinioConfig(
+        endpoint="invalid_uri",
+        access_key="minioadmin",
+        secret_key="minioadmin",
+        bucket="test-bucket",
+    )
+    adapter = MinioAdapter(config=config)
     with pytest.raises(ConnectionError):
         adapter.connect()
     assert not adapter.is_connected()
@@ -142,38 +120,35 @@ def test_should_raise_connection_error_when_unable_to_connect(
 
 def test_should_log_info_when_creating_expected_bucket(
     raw_minio_client: Minio,
+    minio_config: MinioConfig,
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test that the MinioAdapter logs info when creating the expected bucket."""
-    # Arrange
-    bucket_name = str(os.getenv("MINIO_BUCKET"))
+    bucket_name = minio_config.bucket
     raw_minio_client.remove_bucket(bucket_name)
-    adapter = MinioAdapter()
-    # Act
+    adapter = MinioAdapter(config=minio_config)
     with caplog.at_level(logging.INFO):
         adapter.connect()
-    # Assert
     assert f"Creating bucket '{bucket_name}'" in caplog.text
 
 
 def test_should_log_error_on_exception_during_exit(
-    minio_container: dict[str, str],
+    minio_config: MinioConfig,
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test that the MinioAdapter logs an error if an exception occurs during __exit__."""
     try:
-        with MinioAdapter() as adapter:
+        with MinioAdapter(config=minio_config) as adapter:
             assert adapter.is_connected()
             raise ValueError("Simulated error")
     except ValueError:
-        pass  # Expected
-    # Assert error was logged
+        pass
     assert "Error while exiting context" in caplog.text
 
 
-def test_should_have_context_manager() -> None:
+def test_should_have_context_manager(minio_config: MinioConfig) -> None:
     """Test that the MinioAdapter can be used as a context manager."""
-    with MinioAdapter() as adapter:
+    with MinioAdapter(config=minio_config) as adapter:
         assert adapter._client is not None
     assert adapter._client is None
 
@@ -183,11 +158,8 @@ def test_should_get_data(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter can get data from a bucket."""
-    # Arrange
     object_name, expected_data = data_in_minio
-    # Act
     received_data = minio_adapter.get(object_name)
-    # Assert
     assert received_data is not None
     assert same_data(expected_data, received_data)
 
@@ -196,11 +168,7 @@ def test_should_get_none_for_nonexistent_object(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter returns None for a nonexistent object."""
-    # Arrange
-    object_name = "nonexistent_object"
-    # Act
-    received_data = minio_adapter.get(object_name)
-    # Assert
+    received_data = minio_adapter.get("nonexistent_object")
     assert received_data is None
 
 
@@ -208,21 +176,17 @@ def test_should_raise_value_error_on_invalid_get_object_name(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ValueError when getting with an invalid object name."""
-    # Arrange
     invalid_object_names = ["", 123, None]
-    # Act & Assert
     for object_name in invalid_object_names:
         with pytest.raises(ValueError):
             minio_adapter.get(object_name)  # type: ignore
 
 
 def test_should_raise_connection_error_on_get_when_not_connected(
-    minio_adapter: MinioAdapter,
+    minio_config: MinioConfig,
 ) -> None:
     """Test that the MinioAdapter raises ConnectionError when getting while not connected."""
-    # Arrange
-    adapter = MinioAdapter()  # not connected
-    # Act & Assert
+    adapter = MinioAdapter(config=minio_config)
     with pytest.raises(ConnectionError):
         adapter.get("some_object")
 
@@ -231,10 +195,9 @@ def test_should_log_warning_when_getting_nonexistent_object(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test that the MinioAdapter logs a warning when getting a nonexistent object."""
-    # Arrange
-    adapter = MinioAdapter()
-    adapter._client = MagicMock(spec=Minio)
-    adapter._client.get_object.side_effect = S3Error(
+    mock_client = MagicMock(spec=Minio)
+    mock_client.bucket_exists.return_value = True
+    mock_client.get_object.side_effect = S3Error(
         MagicMock(spec=BaseHTTPResponse),
         "NoSuchKey",
         "",
@@ -244,12 +207,10 @@ def test_should_log_warning_when_getting_nonexistent_object(
         bucket_name="test-bucket",
         object_name="missing-object",
     )
-    adapter._bucket_name = "test-bucket"
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG, client=mock_client)
     object_name = "missing-object"
-    # Act
     with caplog.at_level("WARNING"):
         result = adapter.get(object_name)
-    # Assert
     assert result is None
     assert (
         f"Object '{object_name}' not found in bucket '{adapter._bucket_name}'"
@@ -260,10 +221,9 @@ def test_should_log_warning_when_getting_nonexistent_object(
 def test_should_log_error_when_getting_with_s3error_other_than_no_such_key(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
-    """Test that the MinioAdapter logs an error when getting a nonexistent object."""
-    # Arrange
-    adapter = MinioAdapter()
-    adapter._client = MagicMock(spec=Minio)
+    """Test that the MinioAdapter logs an error for unhandled S3 errors."""
+    mock_client = MagicMock(spec=Minio)
+    mock_client.bucket_exists.return_value = True
     other_s3error = S3Error(
         MagicMock(spec=BaseHTTPResponse),
         "UnhandledError",
@@ -274,13 +234,10 @@ def test_should_log_error_when_getting_with_s3error_other_than_no_such_key(
         bucket_name="test-bucket",
         object_name="missing-object",
     )
-    adapter._client.get_object.side_effect = other_s3error
-    adapter._bucket_name = "test-bucket"
-    object_name = "missing-object"
-    # Act
+    mock_client.get_object.side_effect = other_s3error
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG, client=mock_client)
     with caplog.at_level("ERROR"):
-        result = adapter.get(object_name)
-    # Assert
+        result = adapter.get("missing-object")
     assert result is None
     assert repr(other_s3error) in caplog.text
 
@@ -288,18 +245,14 @@ def test_should_log_error_when_getting_with_s3error_other_than_no_such_key(
 def test_should_log_error_when_getting_with_general_exception(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
-    """Test that the MinioAdapter logs an error when getting a nonexistent object."""
-    # Arrange
-    adapter = MinioAdapter()
-    adapter._client = MagicMock(spec=Minio)
+    """Test that the MinioAdapter logs an error on general exceptions during get."""
+    mock_client = MagicMock(spec=Minio)
+    mock_client.bucket_exists.return_value = True
     general_exception = Exception("General failure")
-    adapter._client.get_object.side_effect = general_exception
-    adapter._bucket_name = "test-bucket"
-    object_name = "missing-object"
-    # Act
+    mock_client.get_object.side_effect = general_exception
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG, client=mock_client)
     with caplog.at_level("ERROR"):
-        result = adapter.get(object_name)
-    # Assert
+        result = adapter.get("missing-object")
     assert result is None
     assert repr(general_exception) in caplog.text
 
@@ -307,21 +260,17 @@ def test_should_log_error_when_getting_with_general_exception(
 def test_should_put_data(
     data: BytesIO,
     minio_adapter: MinioAdapter,
+    minio_config: MinioConfig,
 ) -> None:
     """Test that the MinioAdapter can put data into a bucket."""
-    # Arrange
     object_name = "new_test_object"
     received_data = minio_adapter.get(object_name)
-    assert received_data is None  # ensure object does not exist yet
-    # Act
+    assert received_data is None
     minio_adapter.put(object_name, data)
-    # Assert
     received_data = minio_adapter.get(object_name)
     assert received_data is not None
     assert same_data(data, received_data)
-    # Cleanup
-    bucket_name = str(os.getenv("MINIO_BUCKET"))
-    minio_adapter._client.remove_object(bucket_name, object_name)  # type: ignore
+    minio_adapter._client.remove_object(minio_config.bucket, object_name)  # type: ignore[union-attr]
 
 
 def test_should_update_data(
@@ -329,15 +278,12 @@ def test_should_update_data(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter can update data in a bucket."""
-    # Arrange
     object_name, _ = data_in_minio
-    new_data = BytesIO(random.randbytes(2**21))  # 2 MiB
+    new_data = BytesIO(random.randbytes(2**21))
     received_data = minio_adapter.get(object_name)
     assert received_data is not None
     assert not same_data(received_data, new_data)
-    # Act
     minio_adapter.put(object_name, new_data)
-    # Assert
     received_data = minio_adapter.get(object_name)
     assert received_data is not None
     assert same_data(new_data, received_data)
@@ -348,9 +294,7 @@ def test_should_raise_value_error_on_invalid_put_object_name(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ValueError when putting with an invalid object name."""
-    # Arrange
     invalid_object_names = ["", 123, None]
-    # Act & Assert
     for object_name in invalid_object_names:
         with pytest.raises(ValueError):
             minio_adapter.put(object_name, data)  # type: ignore
@@ -360,13 +304,11 @@ def test_should_raise_value_error_on_invalid_put_data(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ValueError when putting with invalid data."""
-    # Arrange
     object_name = "valid_object_name"
     invalid_data = ["not_bytesio", 123, None]
-    # Act & Assert
-    for data in invalid_data:
+    for invalid in invalid_data:
         with pytest.raises(ValueError):
-            minio_adapter.put(object_name, data)  # type: ignore
+            minio_adapter.put(object_name, invalid)  # type: ignore
 
 
 def test_should_raise_value_error_on_invalid_put_content_type(
@@ -374,23 +316,19 @@ def test_should_raise_value_error_on_invalid_put_content_type(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ValueError when putting with an invalid content type."""
-    # Arrange
     object_name = "valid_object_name"
     invalid_content_types = ["", 123, None]
-    # Act & Assert
     for content_type in invalid_content_types:
         with pytest.raises(ValueError):
             minio_adapter.put(object_name, data, content_type)  # type: ignore
 
 
 def test_should_raise_connection_error_on_put_when_not_connected(
+    minio_config: MinioConfig,
     data: BytesIO,
-    minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ConnectionError when putting while not connected."""
-    # Arrange
-    adapter = MinioAdapter()  # not connected
-    # Act & Assert
+    adapter = MinioAdapter(config=minio_config)
     with pytest.raises(ConnectionError):
         adapter.put("some_object", data)
 
@@ -400,36 +338,28 @@ def test_should_delete_object(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter can delete an object from a bucket."""
-    # Arrange
     object_name, _ = data_in_minio
     received_data = minio_adapter.get(object_name)
-    assert received_data is not None  # ensure object exists
-    # Act
+    assert received_data is not None
     minio_adapter.delete(object_name)
-    # Assert
-    received_data = minio_adapter.get(object_name)
-    assert received_data is None
+    assert minio_adapter.get(object_name) is None
 
 
 def test_should_raise_value_error_on_invalid_delete_object_name(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ValueError when deleting with an invalid object name."""
-    # Arrange
     invalid_object_names = ["", 123, None]
-    # Act & Assert
     for object_name in invalid_object_names:
         with pytest.raises(ValueError):
             minio_adapter.delete(object_name)  # type: ignore
 
 
 def test_should_raise_connection_error_on_delete_when_not_connected(
-    minio_adapter: MinioAdapter,
+    minio_config: MinioConfig,
 ) -> None:
     """Test that the MinioAdapter raises ConnectionError when deleting while not connected."""
-    # Arrange
-    adapter = MinioAdapter()  # not connected
-    # Act & Assert
+    adapter = MinioAdapter(config=minio_config)
     with pytest.raises(ConnectionError):
         adapter.delete("some_object")
 
@@ -439,14 +369,11 @@ def test_should_list_objects(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter can list objects in a bucket."""
-    # Arrange
     object_name, _ = data_in_minio
-    new_data = BytesIO(random.randbytes(2**21))  # 2 MiB
+    new_data = BytesIO(random.randbytes(2**21))
     new_data_name = "another_test_object"
     minio_adapter.put(new_data_name, new_data)
-    # Act
     objects = minio_adapter.list_objects()
-    # Assert
     assert isinstance(objects, list)
     assert len(objects) == 2
     assert object_name in objects
@@ -458,15 +385,12 @@ def test_should_list_objects_with_prefix(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter can list objects in a bucket with a prefix."""
-    # Arrange
     object_name, _ = data_in_minio
-    new_data = BytesIO(random.randbytes(2**21))  # 2 MiB
+    new_data = BytesIO(random.randbytes(2**21))
     new_data_name = "prefix_test_object"
     minio_adapter.put(new_data_name, new_data)
     prefix = "prefix_"
-    # Act
     objects = minio_adapter.list_objects(prefix)
-    # Assert
     assert isinstance(objects, list)
     assert len(objects) == 1
     assert new_data_name in objects
@@ -477,25 +401,20 @@ def test_should_raise_value_error_on_invalid_list_objects_prefix(
     minio_adapter: MinioAdapter,
 ) -> None:
     """Test that the MinioAdapter raises ValueError when listing with an invalid prefix."""
-    # Arrange
     invalid_prefixes = [123, None]
-    # Act & Assert
     for prefix in invalid_prefixes:
         with pytest.raises(ValueError):
             minio_adapter.list_objects(prefix)  # type: ignore
 
 
 def test_should_raise_connection_error_on_list_objects_when_not_connected(
-    minio_adapter: MinioAdapter,
+    minio_config: MinioConfig,
 ) -> None:
     """Test that the MinioAdapter raises ConnectionError when listing while not connected."""
-    # Arrange
-    adapter = MinioAdapter()  # not connected
-    # Act & Assert
+    adapter = MinioAdapter(config=minio_config)
     with pytest.raises(ConnectionError):
         adapter.list_objects()
 
 
-# allows local debugging by running file as script
 if __name__ == "__main__":
     pytest.main(["-s", "-v", __file__])
diff --git a/tests/integration/redis_adapter_test.py b/tests/integration/redis_adapter_test.py
index 7cfe8fd..5185204 100644
--- a/tests/integration/redis_adapter_test.py
+++ b/tests/integration/redis_adapter_test.py
@@ -1,11 +1,15 @@
 """Integration tests for the RedisAdapter."""
 
 from collections.abc import Generator
+
 import pytest
 import redis
 from redis.commands.json.path import Path as RedisPath
+
 from python_repositories.adapters.redis_adapter import RedisAdapter
-from python_repositories.interfaces import JsonRepositoryInterface
+from python_repositories.config import RedisConfig
+
+pytestmark = pytest.mark.integration
 
 
 @pytest.fixture(scope="module")
@@ -26,14 +30,13 @@ def data_in_redis(
 
     yield key, data
 
-    # Cleanup
     raw_redis_client.delete(key)
 
 
 @pytest.fixture(scope="module")
-def redis_adapter(redis_container: str) -> Generator[RedisAdapter, None, None]:
+def redis_adapter(redis_config: RedisConfig) -> Generator[RedisAdapter, None, None]:
     """Fixture to provide a connected RedisAdapter instance."""
-    adapter = RedisAdapter()
+    adapter = RedisAdapter(config=redis_config)
     adapter.connect()
     yield adapter
     adapter.disconnect()
@@ -42,38 +45,12 @@ def redis_adapter(redis_container: str) -> Generator[RedisAdapter, None, None]:
 @pytest.fixture(scope="function", autouse=True)
 def clear_redis(raw_redis_client: redis.Redis) -> None:
     """Fixture to clear all Redis keys before each test."""
-    # Clear all keys before each test
     raw_redis_client.flushall()
 
 
-def test_should_adhere_to_interface(redis_container: str) -> None:
-    """Test that the RedisAdapter adheres to the expected interface."""
-    assert issubclass(RedisAdapter, JsonRepositoryInterface)
-    _ = RedisAdapter()
-
-
-def test_should_have_logger_when_instantiated(redis_container: str) -> None:
-    """Test that the RedisAdapter has a logger when instantiated."""
-    adapter = RedisAdapter()
-    assert hasattr(adapter, "logger")
-    assert adapter.logger is not None
-
-
-def test_should_not_be_connected_when_instantiated(redis_container: str) -> None:
-    """Test that the RedisAdapter is not connected when instantiated."""
-    adapter = RedisAdapter()
-    assert adapter._client is None
-    assert not adapter.is_connected()
-
-
-def test_should_raise_connection_error_when_unable_to_connect(
-    monkeypatch: pytest.MonkeyPatch,
-) -> None:
+def test_should_raise_connection_error_when_unable_to_connect() -> None:
     """Test that the RedisAdapter raises ConnectionError when unable to connect."""
-    # Arrange
-    monkeypatch.setenv("REDIS_URI", "redis://invalid:6379")
-    adapter = RedisAdapter()
-    # Act & Assert
+    adapter = RedisAdapter(config=RedisConfig(uri="redis://invalid:6379"))
     with pytest.raises(ConnectionError):
         adapter.connect()
     assert adapter._client is None
@@ -84,42 +61,37 @@ def test_connect_raises_connection_error_when_unable_to_ping(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None:
     """Test that the RedisAdapter raises ConnectionError when ping fails."""
-    # Set an invalid URI
-    monkeypatch.setenv("REDIS_URI", "redis://invalid:6379")
 
-    # Monkeypatch redis.Redis.from_url to return a mock client
     class MockRedis:
         """A mock Redis client that simulates a failed ping."""
 
         def ping(self) -> bool:
-            """Simulate a failed ping."""
-            return False  # Simulate failed ping
+            return False
 
     monkeypatch.setattr("redis.Redis.from_url", lambda *a, **kw: MockRedis())
 
-    adapter = RedisAdapter()
+    adapter = RedisAdapter(config=RedisConfig(uri="redis://invalid:6379"))
     with pytest.raises(ConnectionError, match="Could not connect to Redis"):
         adapter.connect()
 
 
 def test_should_log_error_on_exception_during_exit(
-    redis_container: str,
+    redis_config: RedisConfig,
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test that the RedisAdapter logs an error when an exception occurs during context exit."""
     try:
-        with RedisAdapter() as adapter:
+        with RedisAdapter(config=redis_config) as adapter:
             assert adapter.is_connected()
             raise ValueError("Simulated error")
     except ValueError:
-        pass  # Expected
-    # Assert error was logged
+        pass
     assert "Error while exiting context" in caplog.text
 
 
-def test_should_have_context_manager(redis_container: str) -> None:
+def test_should_have_context_manager(redis_config: RedisConfig) -> None:
     """Test that the RedisAdapter can be used as a context manager."""
-    with RedisAdapter() as adapter:
+    with RedisAdapter(config=redis_config) as adapter:
         assert adapter._client is not None
     assert adapter._client is None
 
@@ -129,11 +101,8 @@ def test_should_get_value(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter can get a value."""
-    # Arrange
     key, data = data_in_redis
-    # Act
     value = redis_adapter.get(key)
-    # Assert
     assert value is not None
     assert value == data
 
@@ -142,9 +111,7 @@ def test_should_get_none_for_missing_key(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that getting a non-existent key returns None."""
-    # Act
     value = redis_adapter.get("nonexistent_key")
-    # Assert
     assert value is None
 
 
@@ -152,21 +119,17 @@ def test_should_raise_value_error_on_invalid_get_key(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter raises ValueError when getting with an invalid key."""
-    # Arrange
     invalid_keys = ["", 123, None]
-    # Act & Assert
     for key in invalid_keys:
         with pytest.raises(ValueError):
             redis_adapter.get(key)  # type: ignore
 
 
 def test_should_raise_connection_error_on_get_when_not_connected(
-    redis_adapter: RedisAdapter,
+    redis_config: RedisConfig,
 ) -> None:
     """Test that the RedisAdapter raises ConnectionError when getting while not connected."""
-    # Arrange
-    adapter = RedisAdapter()  # not connected
-    # Act & Assert
+    adapter = RedisAdapter(config=redis_config)
     with pytest.raises(ConnectionError):
         adapter.get("some_key")
 
@@ -176,13 +139,10 @@ def test_should_set_value(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter can set a value."""
-    # Arrange
     key = "test_key"
     received_data = redis_adapter.get(key)
-    assert received_data is None  # Ensure key does not exist
-    # Act
+    assert received_data is None
     redis_adapter.set(key, data)
-    # Assert
     received_data = redis_adapter.get(key)
     assert received_data is not None
     assert received_data == data
@@ -193,15 +153,12 @@ def test_should_update_value(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter can update an existing value."""
-    # Arrange
     key, _ = data_in_redis
     new_data = {"new_key": "new_value"}
     received_data = redis_adapter.get(key)
     assert received_data is not None
     assert received_data != new_data
-    # Act
     redis_adapter.set(key, new_data)
-    # Assert
     assert redis_adapter.get(key) == new_data
 
 
@@ -210,9 +167,7 @@ def test_should_raise_value_error_on_invalid_set_key(
     data: dict[str, str],
 ) -> None:
     """Test that the RedisAdapter raises ValueError when setting with an invalid key."""
-    # Arrange
     invalid_keys = ["", 123, None]
-    # Act & Assert
     for key in invalid_keys:
         with pytest.raises(ValueError):
             redis_adapter.set(key, data)  # type: ignore
@@ -222,26 +177,21 @@ def test_should_raise_value_error_on_invalid_set_data(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter raises ValueError when setting with invalid data."""
-    # Arrange
     key = "test_key"
     invalid_data = ["", 123, None, [], {}]
-    # Act & Assert
     for data in invalid_data:
         with pytest.raises(ValueError):
             redis_adapter.set(key, data)  # type: ignore
 
 
 def test_should_raise_connection_error_on_set_when_not_connected(
-    redis_adapter: RedisAdapter,
+    redis_config: RedisConfig,
     data: dict[str, str],
 ) -> None:
     """Test that the RedisAdapter raises ConnectionError when setting while not connected."""
-    # Arrange
-    adapter = RedisAdapter()
-    key = "test_key"
-    # Act & Assert
+    adapter = RedisAdapter(config=redis_config)
     with pytest.raises(ConnectionError):
-        adapter.set(key, data)
+        adapter.set("test_key", data)
 
 
 def test_should_delete_key(
@@ -249,13 +199,10 @@ def test_should_delete_key(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that deleting a key removes it from Redis."""
-    # Arrange
     key, _ = data_in_redis
     received_data = redis_adapter.get(key)
-    assert received_data is not None  # Ensure key exists
-    # Act
+    assert received_data is not None
     redis_adapter.delete(key)
-    # Assert
     assert redis_adapter.get(key) is None
 
 
@@ -263,21 +210,17 @@ def test_should_raise_value_error_on_invalid_delete_key(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter raises ValueError when deleting with an invalid key."""
-    # Arrange
     invalid_keys = ["", 123, None]
-    # Act & Assert
     for key in invalid_keys:
         with pytest.raises(ValueError):
             redis_adapter.delete(key)  # type: ignore
 
 
 def test_should_raise_connection_error_on_delete_when_not_connected(
-    redis_adapter: RedisAdapter,
+    redis_config: RedisConfig,
 ) -> None:
     """Test that the RedisAdapter raises ConnectionError when deleting while not connected."""
-    # Arrange
-    adapter = RedisAdapter()
-    # Act & Assert
+    adapter = RedisAdapter(config=redis_config)
     with pytest.raises(ConnectionError):
         adapter.delete("some_key")
 
@@ -286,12 +229,9 @@ def test_should_list_keys(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test listing keys matching a pattern returns correct keys."""
-    # Arrange
     redis_adapter.set("key1", {"a": 1})
     redis_adapter.set("key2", {"b": 2})
-    # Act
     keys = redis_adapter.list_keys("key*")
-    # Assert
     assert set(keys) == {"key1", "key2"}
 
 
@@ -299,25 +239,20 @@ def test_should_raise_value_error_on_invalid_list_keys_pattern(
     redis_adapter: RedisAdapter,
 ) -> None:
     """Test that the RedisAdapter raises ValueError when listing keys with an invalid pattern."""
-    # Arrange
     invalid_patterns = ["", 123, None]
-    # Act & Assert
     for pattern in invalid_patterns:
         with pytest.raises(ValueError):
             redis_adapter.list_keys(pattern)  # type: ignore
 
 
 def test_should_raise_connection_error_on_list_keys_when_not_connected(
-    redis_adapter: RedisAdapter,
+    redis_config: RedisConfig,
 ) -> None:
     """Test that the RedisAdapter raises ConnectionError when listing keys while not connected."""
-    # Arrange
-    adapter = RedisAdapter()
-    # Act & Assert
+    adapter = RedisAdapter(config=redis_config)
     with pytest.raises(ConnectionError):
         adapter.list_keys("some_pattern")
 
 
-# allows local debugging by running file as script
 if __name__ == "__main__":
     pytest.main(["-s", "-v", __file__])
diff --git a/tests/unit/optional_dependencies_test.py b/tests/unit/adapters_test.py
similarity index 98%
rename from tests/unit/optional_dependencies_test.py
rename to tests/unit/adapters_test.py
index f67d64b..ed3ac5f 100644
--- a/tests/unit/optional_dependencies_test.py
+++ b/tests/unit/adapters_test.py
@@ -1,4 +1,4 @@
-"""Tests for optional dependency import behavior."""
+"""Unit tests for lazy adapter loading in adapters subpackage."""
 
 from __future__ import annotations
 
diff --git a/tests/unit/conftest.py b/tests/unit/conftest.py
new file mode 100644
index 0000000..92c7ff5
--- /dev/null
+++ b/tests/unit/conftest.py
@@ -0,0 +1,27 @@
+"""Unit test fixtures for mocked adapters."""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock
+
+import pytest
+import redis
+from minio import Minio
+
+from python_repositories.adapters.minio_adapter import MinioAdapter
+from python_repositories.adapters.redis_adapter import RedisAdapter
+from tests.conftest import TEST_MINIO_CONFIG, TEST_REDIS_CONFIG
+
+
+@pytest.fixture
+def redis_adapter() -> RedisAdapter:
+    """Provide a RedisAdapter with an injected mock client."""
+    mock_client = MagicMock(spec=redis.Redis)
+    return RedisAdapter(config=TEST_REDIS_CONFIG, client=mock_client)
+
+
+@pytest.fixture
+def minio_adapter() -> MinioAdapter:
+    """Provide a MinioAdapter with an injected mock client."""
+    mock_client = MagicMock(spec=Minio)
+    return MinioAdapter(config=TEST_MINIO_CONFIG, client=mock_client)
diff --git a/tests/unit/connection_health_test.py b/tests/unit/connection_aware_adapter_test.py
similarity index 63%
rename from tests/unit/connection_health_test.py
rename to tests/unit/connection_aware_adapter_test.py
index 8b09a06..1ea7ef2 100644
--- a/tests/unit/connection_health_test.py
+++ b/tests/unit/connection_aware_adapter_test.py
@@ -1,39 +1,25 @@
-"""Tests for TTL-cached connection health checks on adapters."""
+"""Unit tests for TTL-cached connection health checks on ConnectionAwareAdapter."""
 
 from __future__ import annotations
 
+from typing import cast
 from unittest.mock import MagicMock, patch
 
-import pytest
 import redis
 
 from python_repositories.adapters.minio_adapter import MinioAdapter
 from python_repositories.adapters.redis_adapter import RedisAdapter
-
-
-@pytest.fixture
-def redis_adapter(monkeypatch: pytest.MonkeyPatch) -> RedisAdapter:
-    monkeypatch.setenv("REDIS_URI", "redis://localhost:6379")
-    return RedisAdapter()
-
-
-@pytest.fixture
-def minio_adapter(monkeypatch: pytest.MonkeyPatch) -> MinioAdapter:
-    monkeypatch.setenv("MINIO_ENDPOINT", "localhost:9000")
-    monkeypatch.setenv("MINIO_ACCESS_KEY", "minioadmin")
-    monkeypatch.setenv("MINIO_SECRET_KEY", "minioadmin")
-    monkeypatch.setenv("MINIO_BUCKET", "test-bucket")
-    return MinioAdapter()
+from tests.conftest import TEST_MINIO_CONFIG, TEST_REDIS_CONFIG
 
 
 class TestRedisConnectionHealth:
-    def test_not_connected_when_no_client(self, redis_adapter: RedisAdapter) -> None:
-        assert not redis_adapter.is_connected()
+    def test_not_connected_when_no_client(self) -> None:
+        adapter = RedisAdapter(config=TEST_REDIS_CONFIG)
+        assert not adapter.is_connected()
 
     def test_connected_when_probe_succeeds(self, redis_adapter: RedisAdapter) -> None:
-        mock_client = MagicMock(spec=redis.Redis)
+        mock_client = cast(MagicMock, redis_adapter._client)
         mock_client.ping.return_value = True
-        redis_adapter._client = mock_client
 
         assert redis_adapter.is_connected()
         mock_client.ping.assert_called_once()
@@ -41,16 +27,15 @@ class TestRedisConnectionHealth:
     def test_stale_connection_when_probe_fails(
         self, redis_adapter: RedisAdapter
     ) -> None:
-        mock_client = MagicMock(spec=redis.Redis)
-        mock_client.ping.side_effect = redis.ConnectionError("connection lost")
-        redis_adapter._client = mock_client
+        cast(MagicMock, redis_adapter._client).ping.side_effect = redis.ConnectionError(
+            "connection lost"
+        )
 
         assert not redis_adapter.is_connected()
 
     def test_cache_hit_avoids_second_probe(self, redis_adapter: RedisAdapter) -> None:
-        mock_client = MagicMock(spec=redis.Redis)
+        mock_client = cast(MagicMock, redis_adapter._client)
         mock_client.ping.return_value = True
-        redis_adapter._client = mock_client
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
@@ -62,9 +47,8 @@ class TestRedisConnectionHealth:
         mock_client.ping.assert_called_once()
 
     def test_cache_miss_runs_probe_again(self, redis_adapter: RedisAdapter) -> None:
-        mock_client = MagicMock(spec=redis.Redis)
+        mock_client = cast(MagicMock, redis_adapter._client)
         mock_client.ping.return_value = True
-        redis_adapter._client = mock_client
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
@@ -76,9 +60,8 @@ class TestRedisConnectionHealth:
         assert mock_client.ping.call_count == 2
 
     def test_disconnect_clears_cache(self, redis_adapter: RedisAdapter) -> None:
-        mock_client = MagicMock(spec=redis.Redis)
+        mock_client = cast(MagicMock, redis_adapter._client)
         mock_client.ping.return_value = True
-        redis_adapter._client = mock_client
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
@@ -87,34 +70,35 @@ class TestRedisConnectionHealth:
             assert redis_adapter.is_connected()
 
         redis_adapter.disconnect()
-        redis_adapter._client = mock_client
+        reinjected = RedisAdapter(
+            config=redis_adapter._config,
+            client=mock_client,
+        )
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
             return_value=100.0,
         ):
-            assert redis_adapter.is_connected()
+            assert reinjected.is_connected()
 
         assert mock_client.ping.call_count == 2
 
 
 class TestMinioConnectionHealth:
-    def test_not_connected_when_no_client(self, minio_adapter: MinioAdapter) -> None:
-        assert not minio_adapter.is_connected()
+    def test_not_connected_when_no_client(self) -> None:
+        adapter = MinioAdapter(config=TEST_MINIO_CONFIG)
+        assert not adapter.is_connected()
 
     def test_not_connected_when_bucket_name_missing(
         self, minio_adapter: MinioAdapter
     ) -> None:
-        minio_adapter._client = MagicMock()
         minio_adapter._bucket_name = None
 
         assert not minio_adapter.is_connected()
 
     def test_connected_when_probe_succeeds(self, minio_adapter: MinioAdapter) -> None:
-        mock_client = MagicMock()
+        mock_client = cast(MagicMock, minio_adapter._client)
         mock_client.bucket_exists.return_value = True
-        minio_adapter._client = mock_client
-        minio_adapter._bucket_name = "test-bucket"
 
         assert minio_adapter.is_connected()
         mock_client.bucket_exists.assert_called_once_with("test-bucket")
@@ -122,18 +106,15 @@ class TestMinioConnectionHealth:
     def test_stale_connection_when_probe_fails(
         self, minio_adapter: MinioAdapter
     ) -> None:
-        mock_client = MagicMock()
-        mock_client.bucket_exists.side_effect = Exception("connection lost")
-        minio_adapter._client = mock_client
-        minio_adapter._bucket_name = "test-bucket"
+        cast(MagicMock, minio_adapter._client).bucket_exists.side_effect = Exception(
+            "connection lost"
+        )
 
         assert not minio_adapter.is_connected()
 
     def test_cache_hit_avoids_second_probe(self, minio_adapter: MinioAdapter) -> None:
-        mock_client = MagicMock()
+        mock_client = cast(MagicMock, minio_adapter._client)
         mock_client.bucket_exists.return_value = True
-        minio_adapter._client = mock_client
-        minio_adapter._bucket_name = "test-bucket"
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
@@ -145,10 +126,8 @@ class TestMinioConnectionHealth:
         mock_client.bucket_exists.assert_called_once()
 
     def test_cache_miss_runs_probe_again(self, minio_adapter: MinioAdapter) -> None:
-        mock_client = MagicMock()
+        mock_client = cast(MagicMock, minio_adapter._client)
         mock_client.bucket_exists.return_value = True
-        minio_adapter._client = mock_client
-        minio_adapter._bucket_name = "test-bucket"
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
@@ -160,10 +139,8 @@ class TestMinioConnectionHealth:
         assert mock_client.bucket_exists.call_count == 2
 
     def test_disconnect_clears_cache(self, minio_adapter: MinioAdapter) -> None:
-        mock_client = MagicMock()
+        mock_client = cast(MagicMock, minio_adapter._client)
         mock_client.bucket_exists.return_value = True
-        minio_adapter._client = mock_client
-        minio_adapter._bucket_name = "test-bucket"
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
@@ -172,13 +149,15 @@ class TestMinioConnectionHealth:
             assert minio_adapter.is_connected()
 
         minio_adapter.disconnect()
-        minio_adapter._client = mock_client
-        minio_adapter._bucket_name = "test-bucket"
+        reinjected = MinioAdapter(
+            config=minio_adapter._config,
+            client=mock_client,
+        )
 
         with patch(
             "python_repositories.adapters.connection_aware_adapter.time.monotonic",
             return_value=100.0,
         ):
-            assert minio_adapter.is_connected()
+            assert reinjected.is_connected()
 
         assert mock_client.bucket_exists.call_count == 2
diff --git a/tests/integration/connection_aware_interface_test.py b/tests/unit/connection_aware_interface_test.py
similarity index 96%
rename from tests/integration/connection_aware_interface_test.py
rename to tests/unit/connection_aware_interface_test.py
index f4d3414..f805faf 100644
--- a/tests/integration/connection_aware_interface_test.py
+++ b/tests/unit/connection_aware_interface_test.py
@@ -1,4 +1,4 @@
-"""Integration tests for ConnectionAwareInterface."""
+"""Unit tests for ConnectionAwareInterface."""
 
 import pytest
 from python_repositories.interfaces.connection_aware_interface import (
diff --git a/tests/integration/context_aware_interface_test.py b/tests/unit/context_aware_interface_test.py
similarity index 95%
rename from tests/integration/context_aware_interface_test.py
rename to tests/unit/context_aware_interface_test.py
index 63cf953..8bffcfd 100644
--- a/tests/integration/context_aware_interface_test.py
+++ b/tests/unit/context_aware_interface_test.py
@@ -1,4 +1,4 @@
-"""Integration tests for ContextAwareInterface."""
+"""Unit tests for ContextAwareInterface."""
 
 from __future__ import annotations
 
diff --git a/tests/unit/dotenv_loader_test.py b/tests/unit/dotenv_loader_test.py
new file mode 100644
index 0000000..43522a2
--- /dev/null
+++ b/tests/unit/dotenv_loader_test.py
@@ -0,0 +1,26 @@
+"""Unit tests for dotenv_loader."""
+
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+import pytest
+
+from python_repositories.config.dotenv_loader import load_dotenv
+
+
+def test_load_dotenv_loads_file(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    env_file = tmp_path / ".env"
+    env_file.write_text("DOTENV_TEST_VAR=loaded_value\n")
+    monkeypatch.delenv("DOTENV_TEST_VAR", raising=False)
+    loaded = load_dotenv(env_file)
+    assert loaded is True
+    assert os.getenv("DOTENV_TEST_VAR") == "loaded_value"
+
+
+def test_load_dotenv_returns_false_for_missing_file(tmp_path: Path) -> None:
+    missing = tmp_path / "missing.env"
+    assert load_dotenv(missing) is False
diff --git a/tests/integration/json_repository_interface_test.py b/tests/unit/json_repository_interface_test.py
similarity index 97%
rename from tests/integration/json_repository_interface_test.py
rename to tests/unit/json_repository_interface_test.py
index 0b8c458..88b98d8 100644
--- a/tests/integration/json_repository_interface_test.py
+++ b/tests/unit/json_repository_interface_test.py
@@ -1,4 +1,4 @@
-"""Integration tests for JsonRepositoryInterface."""
+"""Unit tests for JsonRepositoryInterface."""
 
 import pytest
 from python_repositories.interfaces.json_repository_interface import (
diff --git a/tests/unit/minio_adapter_test.py b/tests/unit/minio_adapter_test.py
new file mode 100644
index 0000000..05cdaf2
--- /dev/null
+++ b/tests/unit/minio_adapter_test.py
@@ -0,0 +1,55 @@
+"""Unit tests for MinioAdapter instantiation and injection."""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock
+
+import pytest
+from minio import Minio
+
+from python_repositories.adapters.minio_adapter import MinioAdapter
+from python_repositories.interfaces import ObjectRepositoryInterface
+from tests.conftest import TEST_MINIO_CONFIG
+
+
+def test_should_adhere_to_interface() -> None:
+    assert issubclass(MinioAdapter, ObjectRepositoryInterface)
+    _ = MinioAdapter(config=TEST_MINIO_CONFIG)
+
+
+def test_should_have_logger_when_instantiated() -> None:
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG)
+    assert hasattr(adapter, "logger")
+    assert adapter.logger is not None
+
+
+def test_should_not_be_connected_when_instantiated() -> None:
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG)
+    assert not adapter.is_connected()
+
+
+def test_constructs_with_injected_config_without_env(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    for var in (
+        "MINIO_ENDPOINT",
+        "MINIO_ACCESS_KEY",
+        "MINIO_SECRET_KEY",
+        "MINIO_BUCKET",
+    ):
+        monkeypatch.delenv(var, raising=False)
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG)
+    assert adapter._config == TEST_MINIO_CONFIG
+
+
+def test_injected_client_sets_bucket_name() -> None:
+    mock_client = MagicMock(spec=Minio)
+    adapter = MinioAdapter(config=TEST_MINIO_CONFIG, client=mock_client)
+    assert adapter._bucket_name == "test-bucket"
+    assert adapter._client is mock_client
+
+
+def test_raises_when_client_provided_without_config() -> None:
+    mock_client = MagicMock(spec=Minio)
+    with pytest.raises(ValueError, match="config is required"):
+        MinioAdapter(client=mock_client)
diff --git a/tests/unit/minio_config_test.py b/tests/unit/minio_config_test.py
new file mode 100644
index 0000000..e530c6f
--- /dev/null
+++ b/tests/unit/minio_config_test.py
@@ -0,0 +1,73 @@
+"""Unit tests for MinioConfig."""
+
+from __future__ import annotations
+
+import pytest
+
+from python_repositories.config import MinioConfig
+
+
+def _set_required_minio_env(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("MINIO_ENDPOINT", "localhost:9000")
+    monkeypatch.setenv("MINIO_ACCESS_KEY", "access")
+    monkeypatch.setenv("MINIO_SECRET_KEY", "secret")
+    monkeypatch.setenv("MINIO_BUCKET", "my-bucket")
+
+
+def test_from_env_loads_all_fields(monkeypatch: pytest.MonkeyPatch) -> None:
+    _set_required_minio_env(monkeypatch)
+    config = MinioConfig.from_env(use_dotenv=False)
+    assert config.endpoint == "localhost:9000"
+    assert config.access_key == "access"
+    assert config.secret_key == "secret"
+    assert config.bucket == "my-bucket"
+    assert config.secure is True
+
+
+def test_from_env_defaults_secure_to_true_when_unset(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    _set_required_minio_env(monkeypatch)
+    monkeypatch.delenv("MINIO_SECURE", raising=False)
+    config = MinioConfig.from_env(use_dotenv=False)
+    assert config.secure is True
+
+
+@pytest.mark.parametrize(
+    ("value", "expected"),
+    [
+        ("true", True),
+        ("1", True),
+        ("yes", True),
+        ("false", False),
+        ("0", False),
+        ("no", False),
+    ],
+)
+def test_from_env_parses_secure(
+    monkeypatch: pytest.MonkeyPatch,
+    value: str,
+    expected: bool,
+) -> None:
+    _set_required_minio_env(monkeypatch)
+    monkeypatch.setenv("MINIO_SECURE", value)
+    config = MinioConfig.from_env(use_dotenv=False)
+    assert config.secure is expected
+
+
+def test_from_env_raises_for_invalid_secure(monkeypatch: pytest.MonkeyPatch) -> None:
+    _set_required_minio_env(monkeypatch)
+    monkeypatch.setenv("MINIO_SECURE", "not-a-bool")
+    with pytest.raises(ValueError, match="MINIO_SECURE"):
+        MinioConfig.from_env(use_dotenv=False)
+
+
+def test_from_env_raises_when_endpoint_missing(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("MINIO_ENDPOINT", raising=False)
+    monkeypatch.setenv("MINIO_ACCESS_KEY", "access")
+    monkeypatch.setenv("MINIO_SECRET_KEY", "secret")
+    monkeypatch.setenv("MINIO_BUCKET", "my-bucket")
+    with pytest.raises(Exception):
+        MinioConfig.from_env(use_dotenv=False)
diff --git a/tests/integration/object_repository_interface_test.py b/tests/unit/object_repository_interface_test.py
similarity index 98%
rename from tests/integration/object_repository_interface_test.py
rename to tests/unit/object_repository_interface_test.py
index 012545c..4e567a4 100644
--- a/tests/integration/object_repository_interface_test.py
+++ b/tests/unit/object_repository_interface_test.py
@@ -1,4 +1,4 @@
-"""Integration tests for ObjectRepositoryInterface."""
+"""Unit tests for ObjectRepositoryInterface."""
 
 from io import BytesIO
 
diff --git a/tests/unit/redis_adapter_test.py b/tests/unit/redis_adapter_test.py
new file mode 100644
index 0000000..9e036be
--- /dev/null
+++ b/tests/unit/redis_adapter_test.py
@@ -0,0 +1,71 @@
+"""Unit tests for RedisAdapter instantiation and injection."""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock
+
+import pytest
+import redis
+
+from python_repositories.adapters.redis_adapter import RedisAdapter
+from python_repositories.interfaces import JsonRepositoryInterface
+from tests.conftest import TEST_REDIS_CONFIG
+
+
+def test_should_adhere_to_interface() -> None:
+    assert issubclass(RedisAdapter, JsonRepositoryInterface)
+    _ = RedisAdapter(config=TEST_REDIS_CONFIG)
+
+
+def test_should_have_logger_when_instantiated() -> None:
+    adapter = RedisAdapter(config=TEST_REDIS_CONFIG)
+    assert hasattr(adapter, "logger")
+    assert adapter.logger is not None
+
+
+def test_should_not_be_connected_when_instantiated() -> None:
+    adapter = RedisAdapter(config=TEST_REDIS_CONFIG)
+    assert adapter._client is None
+    assert not adapter.is_connected()
+
+
+def test_constructs_with_injected_config_without_env(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("REDIS_URI", raising=False)
+    adapter = RedisAdapter(config=TEST_REDIS_CONFIG)
+    assert adapter._config == TEST_REDIS_CONFIG
+
+
+def test_constructs_with_injected_client_without_env(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("REDIS_URI", raising=False)
+    mock_client = MagicMock(spec=redis.Redis)
+    adapter = RedisAdapter(config=TEST_REDIS_CONFIG, client=mock_client)
+    assert adapter._client is mock_client
+    assert adapter._client_injected is True
+
+
+def test_raises_when_client_provided_without_config() -> None:
+    mock_client = MagicMock(spec=redis.Redis)
+    with pytest.raises(ValueError, match="config is required"):
+        RedisAdapter(client=mock_client)
+
+
+def test_disconnect_does_not_close_injected_client() -> None:
+    mock_client = MagicMock(spec=redis.Redis)
+    adapter = RedisAdapter(config=TEST_REDIS_CONFIG, client=mock_client)
+    adapter.disconnect()
+    mock_client.close.assert_not_called()
+    assert adapter._client is None
+
+
+class CustomEnvRedisAdapter(RedisAdapter):
+    uri_env_var_name = "CUSTOM_REDIS_URI"
+
+
+def test_subclass_custom_env_var_name(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("CUSTOM_REDIS_URI", "redis://custom:6379")
+    adapter = CustomEnvRedisAdapter()
+    assert adapter._config.uri == "redis://custom:6379"
diff --git a/tests/unit/redis_config_test.py b/tests/unit/redis_config_test.py
new file mode 100644
index 0000000..d902ebe
--- /dev/null
+++ b/tests/unit/redis_config_test.py
@@ -0,0 +1,27 @@
+"""Unit tests for RedisConfig."""
+
+from __future__ import annotations
+
+import pytest
+
+from python_repositories.config import RedisConfig
+
+
+def test_from_env_loads_uri(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("REDIS_URI", "redis://example:6379")
+    config = RedisConfig.from_env(use_dotenv=False)
+    assert config.uri == "redis://example:6379"
+
+
+def test_from_env_raises_when_uri_missing(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("REDIS_URI", raising=False)
+    with pytest.raises(Exception):
+        RedisConfig.from_env(use_dotenv=False)
+
+
+def test_from_env_respects_custom_env_var_name(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv("CUSTOM_REDIS_URI", "redis://custom:6379")
+    config = RedisConfig.from_env("CUSTOM_REDIS_URI", use_dotenv=False)
+    assert config.uri == "redis://custom:6379"
diff --git a/uv.lock b/uv.lock
index 7a7a3b5..bce88e2 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1059,6 +1059,7 @@ name = "python-repositories"
 version = "0.4.1"
 source = { editable = "." }
 dependencies = [
+    { name = "python-dotenv" },
     { name = "python-utils" },
     { name = "structlog" },
 ]
@@ -1087,6 +1088,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "minio", marker = "extra == 'minio'", specifier = ">=7.2.16" },
+    { name = "python-dotenv", specifier = ">=1.0.0" },
     { name = "python-utils", specifier = ">=0.1.0", index = "https://gitea.lille-vemmelund.dk/api/packages/brian/pypi/simple/" },
     { name = "redis", marker = "extra == 'redis'", specifier = ">=6.4.0" },
     { name = "structlog", specifier = ">=25.4.0" },