...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Declares and registers a global fixture. The global fixture is called before any of the test case in the test tree is executed. The class implementing the fixture should have the appropriate interface. As any fixture, it is possible to have test assertions in the global fixture.
See here for more details.