import pytest
# Simple calculator add function
def add(a: int, b: int) -> int:
return a + b
# Black-box tests: test only inputs and outputs
def test_add_black_box_positive():
# Test adding positive numbers
assert add(2, 3) == 5
def test_add_black_box_negative_and_positive():
# Test adding negative and positive number
assert add(-1, 1) == 0
def test_add_black_box_zeros():
# Test adding zeros
assert add(0, 0) == 0
# White-box test: test internal logic explicitly
def test_add_white_box_logic():
# Since add is a simple return of a + b, test with multiple values
for a, b in [(10, 5), (-3, -7), (0, 4)]:
expected = a + b
result = add(a, b)
assert result == expected, f"Expected {expected} but got {result}"
if __name__ == "__main__":
pytest.main()
The add function is a simple addition returning a + b.
Black-box tests test_add_black_box_positive, test_add_black_box_negative_and_positive, and test_add_black_box_zeros check the function output for given inputs without looking at the code.
The white-box test test_add_white_box_logic runs multiple inputs and compares the result to the expected sum, explicitly verifying the logic inside the function.
Using pytest allows simple assert statements and easy test running.
Each test is independent and clearly named to show if it is black-box or white-box testing.
