RFR: 8288495: [test] Make OutputAnalyzer exception more informative

[Jaikiran Pai]

On Wed, 22 Jun 2022 18:19:56 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> The RuntimeException from OutputAnalyzer for expected and unexpected exit values should include both the actual and expected values.
> The method `shouldHaveExitvalue` and `shouldNotHaveExitValue` include the value expected and the value not expected instead of the actual value returned. The values provided in the exception are already known quantities in the code, what is not known is the actual value.  
> The actual value is printed to stderr but not the expected value and in the logs, the exception report is frequently to stdout and therefor separated in the log from the output of stderr.  Including both expected and actual values in the exception makes it easier to understand.
> 
> Exception messages should not include newlines.

The source changes look fine to me. The test file change would need a copyright year update.

test/lib-test/jdk/test/lib/process/OutputAnalyzerTest.java line 223:

> 221:             try {
> 222:                 // Verify the exception message
> 223:                 OutputAnalyzer out = ProcessTools.executeProcess("true");

Hello Roger, this test seems to run on all OS. Is `true` available on Windows? If yes, does it require a `.exe` suffix?

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PR: https://git.openjdk.org/jdk/pull/9247