BOOST_TEST: details on expressions
Once a test case has been declared, the body of this test should be written. A test case is a sequence of operations in which assertions are inserted. Those assertions evaluate statements that implement the expectation being validated, and report failures and/or informations in a uniform manner, depending on the log level.
The Unit Test Framework's supplies a toolbox of assertions
to ease the creation and maintenance of test cases and provide a uniform error
reporting mechanism. The toolbox supplied is in most part in a form of macro
declarations. An (almost) unique interface to all of them implemented by the
All macros arguments are calculated once, so it's safe to pass complex expressions in their place.
All tools automatically supply an error location: a file name and a line number, which can also be overridden.
The testing tools are intended for unit test code rather than library or
production code, where throwing exceptions, using