Question

I’m using UnitTest++ for unit testing C++ code.

In my tests, there’s a group of tests I repeat several times. What I’d like is for a utility function to perform these tests. In short, I’d like to take this:

TEST( foo ) {
    Foo one;
    Foo two;

    // init one & two
    // lots of CHECK_CLOSE(one.bar, two.bar, 1e-5); in repeating cycles
}

TEST( bar ) {
    Foo one;
    Foo two;

    // init one & two
    // lots of CHECK_CLOSE(one.bar, two.bar, 1e-5); in repeating cycles
}

And use this:

void blah( const Foo& one, const Foo& two ) {
    // lots of CHECK_CLOSE(one.bar, two.bar, 1e-5);
}

TEST( foo ) {
    Foo one;
    Foo two;

    // init one & two
    blah(one, two);
}

TEST( bar ) {
    Foo one;
    Foo two;

    // init one & two
    blah(one, two);
}

This doesn’t work due to UnitTest++’s macro manipulations. What is the best way to approach this problem?

edit: A couple of thoughts which I can’t check out right now.

1. If I use a fixture, with the utility function in the struct, will I be able to call UnitTest++ macros from within this function?
2. I can write a macro to perform the common tests. I don’t really like this, but at least I’ll stary dry…

Answer 1

Write a macro to do it. Don’t let the “macros are evil” mantra hide this fact from you: Macros are designed to generate repetitive code.