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- [/
- / Copyright (c) 2003 Boost.Test contributors
- /
- / Distributed under the Boost Software License, Version 1.0. (See accompanying
- / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- /]
- [section:enabling Enabling or disabling test unit execution]
- The __UTF__ provides a way for enabling or disabling a test unit execution. If a test case is disabled, it will not be
- run by the test runner. If a test suite is disabled, its status is inherited by the test units under its subtree, unless
- otherwise specified.
- The run status can be overridden by the command line parameters: by providing the appropriate arguments to the command
- line, a disabled test may still be executed. The [link boost_test.runtime_config.test_unit_filtering test unit
- filtering] section covers this feature in details.
- [warning There is a difference between a disabled test and a skipped test:
- * a disabled test has a run status set to disabled, and is completely discarded by the __UTF__.
- * a skipped test is a test that has a run status set to enabled, but which execution has been skipped at runtime.
- ]
- [h3 Unconditional run status]
- Decorator __decorator_disabled__ indicates that the test unit's __default_run_status__ is ['false]. This means that that
- test cases inside this test unit will not be run by default, unless otherwise specified. Decorator __decorator_enabled__
- indicates that the test unit's default run status is ['true]. This means that that test cases inside this test unit will
- be run by default, unless otherwise specified.
- [bt_example decorator_05..decorators enabled and disabled..run-fail]
- Syntactically, it is possible to apply both decorators `enabled` and `disabled` to the same test unit. This is reported
- as set-up error when the test program is run.
- [h3 Compilation-time run status]
- Decorator __decorator_enable_if__ indicates that the test unit's __default_run_status__ is either ['true] or ['false],
- depending on the value of `Condition`. This means that that test cases inside this test unit will or will not be run by
- default.
- [bt_example decorator_06..decorator enable_if..run-fail]
- Decorator `enable_if<true>()` is equivalent to decorator `enabled()`. Similarly, `enable_if<false>()` is equivalent to
- decorator `disabled()`.
- [/-----------------------------------------------------------------]
- [h3 Runtime run status]
- Decorator __decorator_precondition__ associates a ['predicate] with a test unit. Before the test unit is executed, the
- predicate is evaluated with the test unit's ID passed as the argument. If it evaluates to `false`, execution of the test
- unit is skipped. Skipping a test suite means skipping the execution of every test unit inside.
- [tip The precondition may return an [classref boost::test_tools::assertion_result assertion_result] instead of a boolean.
- In that case, the message contained in the `assertion_result` will be printed by the __UTF__.]
- [bt_example decorator_08..decorator precondition..run-fail]
- In the example above, the user defined a custom predicate `if_either` that evaluates to `true` if at least one of the two
- specified tests passed. (It assumes that the tests are registered in the specific order.)
- * Test case `test3` has a precondition that at either `test1` or `test2` passed. The precondition is satisfied,
- therefore `test3` is run (and fails),
- * test case `test4` has a precondition that either `test2` or `test3` passed. Since they both failed, the
- precondition is not satisfied, therefore `test4` is skipped.
- [note A __decorator_precondition__ that evaluates to `false` does not yield an error and does not fail the attached unit test. However
- the __UTF__ returns an error if the test tree is empty (see [link boost_test.tests_organization.test_tree.test_tree_content this section]
- for more details). ]
- [endsect]
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