Does anyone have a solution for writing unit tests with Boost Test that run in multiple processes? I am using MPI, but I think the same problem would appear in other multi-process situations. I need some way to collect whether, e.g., BOOST_CHECK, has passed. Here's a schematic view of the problem. I want my "example" test to fail because should_be_true is false on process 1. What happens is that I get success on process 0 and failure in process 1. #define BOOST_TEST_MAIN #include <boost/test/unit_test.hpp> BOOST_AUTO_TEST_CASE(example) { double should_be_unity; const double tolerance = 1.0e-10; // do something that sets should_be_unity to 1.0 // in process 0, and 1.1 in process 1. BOOST_CHECK_CLOSE(sh); } I then run the test with mpirun -np 2 ./mytest Obviously, I can write all my tests