Day 28 - Testing

Author: Zemerik

Day 28 - Testing/Commands.mdx

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+```bash
+# Run all tests
+pytest -v
+
+# Run with coverage
+pytest --cov=myapp --cov-report=html
+
+# Run specific tests
+pytest -k "test_multiply"
+```

Day 28 - Testing/README.md

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+# Day 28: Testing
+
+## What You'll Learn:
+- Writing test cases with `unittest`
+- pytest framework features
+- Test fixtures and parametrization
+- Mocking external dependencies
+- Measuring test coverage
+
+## Files:
+1. `test_math_utils.py` - Basic test cases
+2. `test_fixtures.py` - pytest fixtures
+3. `parametrized_tests.py` - Data-driven testing
+4. `test_coverage.py` - Coverage analysis
+
+## Exercises:
+1. Create test suite for a calculator module that:
+   - Tests all arithmetic operations
+   - Covers edge cases (division by zero)
+   - Mocks file I/O operations
+
+2. Build test coverage for an API client:
+   - Mock HTTP responses
+   - Test error handling
+   - Validate JSON parsing

Day 28 - Testing/parametrized_tests.py

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+import pytest
+from calculator import multiply
+
+@pytest.mark.parametrize("a,b,expected", [
+    (2, 3, 6),
+    (-4, 5, -20),
+    (0, 100, 0),
+])
+def test_multiply(a, b, expected):
+    assert multiply(a, b) == expected

Day 28 - Testing/requirements.txt

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+pytest==7.4.0
+pytest-cov==4.1.0

Day 28 - Testing/test_coverage.py

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+# File to test coverage for
+def calculate_stats(numbers):
+    return {
+        "mean": sum(numbers)/len(numbers),
+        "min": min(numbers),
+        "max": max(numbers)
+    }
+
+# Test file
+def test_stats():
+    result = calculate_stats([10, 20, 30])
+    assert result["mean"] == 20
+    assert result["min"] == 10
+    assert result["max"] == 30

Day 28 - Testing/test_fixtures.py

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+import pytest
+
+@pytest.fixture
+def database():
+    """Fixture providing test database connection"""
+    db = connect_to_test_db()
+    yield db
+    db.disconnect()
+
+def test_user_count(database):
+    assert database.get_user_count() == 0
+
+@pytest.fixture
+def sample_user():
+    return {"name": "Alice", "email": "alice@example.com"}
+
+def test_user_creation(sample_user):
+    assert "@" in sample_user["email"]

Day 28 - Testing/test_math_utils.py

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+import unittest
+from math_utils import add, subtract, divide
+
+class TestMathUtils(unittest.TestCase):
+    def test_add(self):
+        self.assertEqual(add(2, 3), 5)
+        self.assertEqual(add(-1, 1), 0)
+
+    def test_subtract(self):
+        self.assertEqual(subtract(5, 2), 3)
+
+    def test_divide(self):
+        self.assertAlmostEqual(divide(10, 3), 3.333, places=2)
+        with self.assertRaises(ValueError):
+            divide(5, 0)
+
+if __name__ == '__main__':
+    unittest.main()