BOOST_TEST macro's argument must be put between brackets

[anonymous]

This program doesn't work

#define BOOST_TEST_MODULE test
#include <boost/test/included/unit_test.hpp>

struct B {};
struct A {
	bool operator ==(const B &b) {
		return true;
	}
};

BOOST_AUTO_TEST_CASE(test_case) {
	A a;
	B b;
	BOOST_TEST(a == b);
	// BOOST_TEST((a == b)); // this version works
}

[Gennadiy Rozental]

1. Don't name your test case test_case
2. make operator== const
3. Add BOOST_TEST_DONT_PRINT_LOG_VALUE(A) BOOST_TEST_DONT_PRINT_LOG_VALUE(B)

or implement operator<< for A and B

And this example works fine for me with single brackets.

[anonymous]

About const, I forgot it in this short example and the name of the test case was randomly picked.

But, about the different behaviour when there are brackets around the condition and when not, it feels inconsistent to me. Also, I got some very cryptic error messages from the compiler referring to boost's files. I'm ok with boost trying to print the object it is testing if this is a generally expected behaviour in unit test frameworks. However a static_assert with a comprehensible error message in case this can't be done should be useful and save much debugging time.

Thank you for the help.

[Gennadiy Rozental]

Try branch assert-printability