
The `BUILD_TESTING` variable is referenced in `add_test` and `enable_testing`. It should be documented as it controls the behavior tests working when projects use `include(CTest)`.
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enable_testing
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--------------
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Enable testing for current directory and below.
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.. code-block:: cmake
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enable_testing()
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Enables testing for this directory and below.
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This command should be in the top-level source directory because
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:manual:`ctest(1)` expects to find a test file in the top-level
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build directory.
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This command is automatically invoked when the :module:`CTest`
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module is included, except if the :variable:`BUILD_TESTING`
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option is turned off.
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See also the :command:`add_test` command.
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