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Falderal Test: Standard output and standard error
-------------------------------------------------

When we have a test that expects a successful result, the
expected text is matched against standard output.

    -> Functionality "Succeed" is implemented by shell command
    -> "python3 fail.py %(test-body-text) bar 0"

    -> Tests for functionality "Succeed"

    | foo
    = foo

If you wish to match the expected result against both standard
output and standard error, it's up to you to redirect them.

    -> Functionality "Succeed/All" is implemented by shell command
    -> "python3 fail.py %(test-body-text) bar 0 2>&1"

    -> Tests for functionality "Succeed/All"

    | foo
    = foo
    = bar

When we have a test that expects an error result, the
expected text is matched against standard error.

    -> Functionality "Fail" is implemented by shell command
    -> "python3 fail.py foo %(test-body-text) 1"

    -> Tests for functionality "Fail"

    | bar
    ? bar

If you wish to match the expected error against both standard
output and standard error, it's up to you to redirect them.

    -> Functionality "Fail/All" is implemented by shell command
    -> "python3 fail.py foo %(test-body-text) 1 1>&2"

    -> Tests for functionality "Fail/All"

    | bar
    ? foo
    ? bar