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A test idea is a brief statement of something that should be tested. For example, if you're testing a square root function, one idea for a test would be "test a number less than zero". The idea is to check if the code handles an error case.
Test ideas are gotten in a number of ways. This program helps derive test ideas from expressions that contain boolean operators and relational operators. The rationale behind the program is described in my "Testing for Programmers" course notes, beginning with the slide titled "A Program for Finding Faults in Boolean Expressions", currently slide 22.
This program has a primitive command-line interface. Someday I will enter the 80's and put on a GUI. Then I'd enter the 90's and provide an applet interface, except it's the 00's and Java in the browser is going away. Here's what it looks like with the timeless interface:
% multi Type in an expression. 'q' to quit. > a && b < c Test ideas for (a && (b<c)): a (b<c) ----- ------------ true b barely < c FALSE true true b==c > q
So, if the expression is inside a function foo(boolean a, int b, int c), these three test inputs might satisfy the test ideas:
That's pretty much all there is to it.
In this version, there's one major restriction. The expressions cannot contain duplicate names:
> (a && b) || (a && c) Parse Error: 'a' appears twice in the expression. Duplicates aren't allowed yet.
Multi is written in Java. Stop now if you don't have Java on your machine.
After the first person asks, I'll package up the source into a tidy distribution.
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