[build2] Checking the output of a test against a file

[Ankur deDev]

Hi Build2,
I am trying to check that the output of a test equals a fixed value that is stored in a file.
Is there in Testscript a simple built-in way to check the output of a test (stdout for example) against a given file?
Ideally the file could be empty or not even exist if the output generated by the test is empty.
Thanks!
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