def test_point_negative_on_one_line(self):
"""Negative test of Point.on_one_line method."""
a = Point(1, 0)
b = Point(34, 0)
c = Point(42, 0)
with self.assertRaises(ValueError) as err:
Point.on_one_line('foo', a, b, c)
self.assertEqual(
err.args[0], "Some of given arguments is not points.",
"Test of Point.on_one_line('foo', a, b, c) failed, no ValueError was raised."
)
def test_point_positive_on_one_line(self):
"""Negative test of Point.on_one_line method."""
a = Point(1, 0)
b = Point(34, 0)
c = Point(42, 0)
self.assertTrue(
Point.on_one_line(a, b, c),
"Test of Point.on_one_line(a, b, c) failed, returned value != True."
)
d = Point(1, 2)
e = Point(34, 43)
f = Point(42, 54)
self.assertFalse(
Point.on_one_line(d, e, f),
"Test of Point.on_one_line(d, e, f) failed, returned value != False."
)
self.assertTrue(
Point.on_one_line(a),
"Test of Point.on_one_line(a) failed, returned value != True.")