Enhanced test coverage with property-based, boundary, and type testing

Author: jsavage

tests/test_factorial.py

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+import pytest
+from hypothesis import given, strategies as st
+from factorial import factorial
+
+# Original tests
+def test_factorial():
+    assert factorial(5) == 120
+    assert factorial(0) == 1
+    assert factorial(3) == 6
+
+def test_factorial_negative():
+    with pytest.raises(ValueError):
+        factorial(-5)
+
+# Large number testing
+def test_factorial_large_numbers():
+    assert factorial(10) == 3628800
+    assert factorial(20) == 2432902008176640000
+
+# Property-based testing
+@given(st.integers(min_value=0, max_value=20))
+def test_factorial_properties(n):
+    result = factorial(n)
+    if n > 0:
+        assert result == n * factorial(n-1)
+    else:
+        assert result == 1
+
+# Boundary testing
+def test_factorial_boundary():
+    assert factorial(1) == 1
+    with pytest.raises(ValueError):
+        factorial(1000)  # Test upper limit
+
+# Type checking
+def test_factorial_type_validation():
+    with pytest.raises(TypeError):
+        factorial(3.14)
+    with pytest.raises(TypeError):
+        factorial("5")