fixed tests

pyproject.toml

@@ -9,10 +9,20 @@ dependencies = [
     "uvicorn>=0.38.0",
 ]
 
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/baby_monitor"]
+
 [dependency-groups]
 dev = [
+    "httpx>=0.28.1",
     "mypy>=1.18.2",
     "pre-commit>=4.3.0",
+    "pytest>=8.4.2",
+    "pytest-cov>=7.0.0",
     "pyupgrade>=3.21.0",
     "ruff>=0.14.3",
 ]
@@ -39,3 +49,9 @@ warn_unreachable = true  # catch unreachable code
 show_error_codes = true  # show error codes in output
 explicit_package_bases = true  # reduce risk of import confusion
 namespace_packages = true  # enable namespace packages
+
+[tool.pytest.ini_options]
+markers = [
+    "unit: marks tests as unit tests",
+    "integration: marks tests as integration tests",
+]