Unit test frameworks

I’ve never understood why people use GTest, CppUnit, Catch, oh wait, Catch2 now.
Here is my C++ unit test framework:

// test object constructor calls function
struct test {
    test(const std::function& f)
        try {
        catch (const std::exception& ex) {
            fputs(ex.what(), stderr);

Just write a int main() { return 0; } file and add .cpp files that call your tests.
They look something like this:

test my_function([]()
    assert (my_function_works());

Just make sure my_function_works throws an exception with an informative message. I use ensure for that.
More examples can be found here.
Why make things complicated?

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