From Get docs
Cmake/docs/3.21/command/enable testing


Enable testing for current directory and below.


Enables testing for this directory and below.

This command should be in the source directory root because ctest expects to find a test file in the build directory root.

This command is automatically invoked when the CTest module is included, except if the BUILD_TESTING option is turned off.

See also the add_test() command.

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