def test_classify_triangle(self):
t1 = Triangle(1, 2, 3)
t2 = Triangle(3, 4, 5)
t3 = Triangle(3, 3, 3)
t4 = Triangle(4, 4, 5)
assert t1.classify_triangle().lower() == "scalene"
assert t2.classify_triangle().lower() == "scalene"
assert t3.classify_triangle().lower() == "equilateral"
assert t4.classify_triangle().lower() == "isosceles"
