enable_testing

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


enable_testing

Enable testing for current directory and below.

enable_testing()

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.

© 2000–2021 Kitware, Inc. and Contributors
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/command/enable_testing.html