def test_add_return_type():
"""
Check the return value of the duck-typed function
"""
assert isinstance(pt.add(5, 5), int)
assert isinstance(pt.add(5, 5.0), float)
assert isinstance(pt.add(5.0, 5.0), float)
def test_add_simple():
"""
This is a simple test that checks the return value
"""
assert 10 == pt.add(5, 5)
assert 3 == pt.add(5, -2)
assert 3 == pt.add(-2, 5)
def test_app():
assert add(2, 2, 2) == 6 # noqa: E712