def test_add4():
""" test case to validate two positive numbers"""
assert add(-10, -5) == -15
def ttest_typeerror1():
""" test case to check if we can handle non number input"""
with pytest.raises(TypeError):
add('a', 5)
def test_add(x, y, ans):
""" test case to validate two positive numbers"""
assert add(x, y) == ans