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The SaveRestoreEnvironment helper object makes sure that the original environment is restored immediately after the StartProcess call returns rather than waiting for the end of the test. When tests are executed in parallel, there is no guarantee about the ordering of EndTest calls relative to StartTest calls. In fact, it would be odd for them to be nested nicely. Therefore, to avoid the corruption of the calling ctest's environment, the original environment must be restored before ForkProcess returns.
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