Boost Build testing framework conundrum

Does the Boost Build testing framework, when running the 
'toolset_clang_linux.py" test, actually invoke the clang compiler when 
running the test ? Because when I run the test on my local machine in 
Windows 10 the clang compiler is not even in my PATH at the time the 
test is being run, yet the test "succeeds" on the current 'develop' 
branch whereas for my PR it is failing. So I do not understand how the 
test can verify that the clang-linux.jam is correct. Can someone please 
enlighten me on how this is supposed to work ? I do run the tests with 
the --preserve option but when the test succeeds the entire directory 
structure where the files would be is in a temporary directory and all 
the files in that temporary directory are removed by the end of the test.

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