Return code to mark a test as skipped.
Sometimes only a test itself can determine if all requirements for the test are met. If such a situation should not be considered a hard failure a return code of the process can be specified that will mark the test as Not Run if it is encountered. Valid values are in the range of 0 to 255, inclusive.
See also the SKIP_REGULAR_EXPRESSION property.
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https://cmake.org/cmake/help/v3.19/prop_test/SKIP_RETURN_CODE.html