cli::tests: program: Clarify all unwrap_err()
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#1166
Merged
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unwrap_err()
does not contain a descriptive message for the case when it succeeds. It may help someone debugging the test, in particular they will see a short explanation without looking at the failed test.Also, in a number of cases,
unwrap_err()
result was not checked, creating a possibility for false positives. As the generated error might be different from the one expected by the test author.This PR includes #1165, I will rebase it after #1165 is merged.
Please, consider only the second commit.