enable_testing

Enable testing for current directory and below.

enable_testing()

Enables testing for this directory and below. See also the add_test() command. Note that ctest expects to find a test file in the build directory root. Therefore, this command should be in the source directory root.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/command/enable_testing.html