def test_none():
"""Test for None value as parameter"""
with pytest.raises(TypeError):
distance(None, 'b', 'c', 'd')
def test_typical():
"""Test tupical coordinates"""
assert distance(10, 15, 20, 5) == 14.142135623730951
def test_points_order():
"""Test that the order of points does not matter"""
distance1 = distance(10, 15, 20, 5)
distance2 = distance(20, 5, 10, 15)
assert distance1 == distance2
def test_only_horizontal():
"""Test only vertical coordinates"""
assert distance(1, 1, 5, 1) == 4
def test_only_vertical():
"""Test only vertical coordinates"""
assert distance(1, 1, 1, 5) == 4
def test_negative():
"""Test for negative coordinates"""
assert distance(-1, -3, -5, -6) == 5.0
def test_zero_length():
"""Test for zero distance"""
assert distance(1, 1, 1, 1) == 0
def test_non_integer():
"""Test for no integer as parameter"""
with pytest.raises(TypeError):
distance('aoeu', 0, 1, 2)