added tests

test-projects/python-basic/tests/test_utils.py

@@ -0,0 +1,41 @@
+"""Tests for the utils module."""
+
+import pytest
+from test_package.utils import format_number, is_even, factorial
+
+
+class TestUtils:
+    """Test cases for utility functions."""
+    
+    def test_format_number_integer(self):
+        """Test formatting integers."""
+        assert format_number(42) == "42"
+        assert format_number(-5) == "-5"
+    
+    def test_format_number_float(self):
+        """Test formatting floats."""
+        assert format_number(3.14159) == "3.14"
+        assert format_number(3.14159, 3) == "3.142"
+        assert format_number(2.0) == "2.00"
+    
+    def test_is_even(self):
+        """Test even number detection."""
+        assert is_even(2) is True
+        assert is_even(4) is True
+        assert is_even(1) is False
+        assert is_even(3) is False
+        assert is_even(0) is True
+        assert is_even(-2) is True
+        assert is_even(-1) is False
+    
+    def test_factorial_positive(self):
+        """Test factorial of positive numbers."""
+        assert factorial(0) == 1
+        assert factorial(1) == 1
+        assert factorial(5) == 120
+        assert factorial(3) == 6
+    
+    def test_factorial_negative(self):
+        """Test factorial of negative numbers raises error."""
+        with pytest.raises(ValueError, match="Factorial is not defined for negative numbers"):
+            factorial(-1)