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BOOST_TEST: details on expressionsOnce 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 information 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
      macro BOOST_TEST.
    
| ![[Note]](../../../../../doc/src/images/note.png) | Note | 
|---|---|
| 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.
| ![[Caution]](../../../../../doc/src/images/caution.png) | Caution | 
|---|---|
| 
        The testing tools are intended for unit test code rather than library or
        production code, where throwing exceptions, using  | 
For a list of all supplied testing tools and usage examples, see the summary or the reference.