The Triangle Test is considered as a classic exercise for devising test cases. This was devised by Glenford Myers whose name should be vaguely familiar to the testers. His name pops up at least once in the tester training material, but he is more known for authoring “The Art of Software Testing.”
Anyway, in this exercise, you are supposed to test a very simple program.
The program reads three integer values from an input dialog. The three values represent the lengths of the sides of a triangle. The program displays a message that states whether the triangle is scalene (no equal sides), isosceles (two equal sides), or equilateral (three equal sides).
So try out listing your test cases. Give it about 30 minutes to an hour.