What is an Isosceles triangle?

On task Triangle in Delphi Pascal on Exercism

An isosceles triangle has at least two sides the same length. (It is sometimes specified as having exactly two sides the same length, but for the purposes of this exercise we’ll say at least two.)

The test that fail is like this

procedure IsoscelesTests.FirstTriangleInequalityViolation;
  Assert.AreEqual(false, Triangle.Sides(Isosceles, 1, 1, 3));

A triangle with sides 1,1 and 3 have 2 sides equal. So isn’t that Isosceles and true result is expected ?

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Triangles with sides 1, 1, 3 do not exist. The name of the test suggests as much.

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Of course that is correct. Thanks!

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