Not sure what your main goal was for that test, but a similar test already
exists to ensure proper definition of CMAKE_BUILD_TYPE or proper selection
of build configuration in a multi-config generator. But only in the context
of running a ctest -D dashboard or a ctest -S dashboard script.

See the files Tests/CTestConfig/CMakeLists.txt and
Tests/CTestConfig/CTestConfig.cxx for details.

You would need a block for "if(CMAKE_CONFIGURATION_TYPES)" in order to get
the logic just right w.r.t. CMAKE_BUILD_TYPE in your test.

The Visual Studio and/or Xcode dashboards that did pass your test, passed
it by luck because the built configuration happened to match the
CMAKE_BUILD_TYPE that you were trying to "expect".

The important piece of knowledge to have here is that CMAKE_BUILD_TYPE is
not defined for multi-config generators, and in fact, it should be
considered bad practice, although it's not strictly an error, to define it
in such a build tree. Because in a multi-config generator you can actually
have multiple builds (Debug+Release+...) existing side-by-side in the same
build tree.


Hope this helps,
David
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