...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
The test module, and hence the test tree, should have at least one test-case scheduled for execution, otherwise the Unit Test Framework returns an error.
This check is performed after the filtering of the tests has occurred. The sections about tests enabling/disabling, tests dependencies and runtime filtering explain various methods that modify the tests that are being run.
A global fixture is not considered as a test case.