CTEST_CUSTOM_ERROR_POST_CONTEXT
The number of lines to include as context which follow an error message by the ctest_test() command. The default is 10.
It is initialized by ctest(1), but may be edited in a CTestCustom file. See ctest_read_custom_files() documentation.
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https://cmake.org/cmake/help/v3.15/variable/CTEST_CUSTOM_ERROR_POST_CONTEXT.html