[CMake] CMakeLists.txt: How to print a message if ctest fails?

[Muhammad Osama]

Is there a way I can setup CMakeLists.txt to print a message if ctest tests
fail? For example:

cmake ..
make
ctest // fails
message output: Please contact xyz at mail.com to resolve testing problems.

​Note the message output is not for cmake but for ctest.​

--​​
Muhammad
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