Using Boost::Test for parallel code

boost, c++, mpi, unit-testing

Solution

Boost Test has fixture support, which allows you to perform setup/cleanup per test case, test suite, or globally. Sounds like you should put the call to `MPI::Init` in a global fixture.

struct MPIFixture {
    MPIFixture() { MPI::Init(); }
    ~MPIFixture() { /* I bet there's a deinit you should call */ }
};

BOOST_GLOBAL_FIXTURE(MPIFixture);

If you have trouble working with that, or if you are working in a framework that provides its own `main` function, then you can `#define BOOST_TEST_NO_MAIN` before including the Boost headers. Then you can invoke `boost::unit_test::unit_test_main` yourself to run your test suites.

Problem

I want to create some tests with boost::unit_test for my parallel (mpi based) C++ codes. I have some basic experiences in using the test framework. For me the main problem, when going to parallel codes, is where to put MPI::Init, such that it is called first. In the test suites I have created there is no main function. Furthermore, does Boost::Test exists correctly (with respect to mpi) when some assertions fail on a subset of the existing ranks?

Original source

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