TestMessage 
    Message associated with the test state. Can be linked to a specific source range -- useful for assertion failures, for example.
Properties
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                  Actual test output. If given with expectedOutput , a diff view will be shown.
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                  Context value of the test item. This can be used to contribute message- specific actions to the test peek view. The value set here can be found in the testMessage property of the following menus contribution points:
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                  Expected test output. If given with actualOutput , a diff view will be shown.
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                  The stack trace associated with the message or failure.