RFR: JDK-8326389: [test] improve assertEquals failure output [v3]

[Matthias Baesken]

On Mon, 26 Feb 2024 06:57:49 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> Hello David, the updated text that I proposed to Matthias, of the form "expected: ... but was: ..." was borrowed from what junit5

Unfortunately we get now error messages like this 

java.lang.RuntimeException: VM output should contain exactly one rtm locking statistics entry for method compiler.testlibrary.rtm.XAbortProvoker::forceAbort expected: 0 but was: 1

It should be ... expected: 1 but was: 0 ; the assertEquals has this interface `assertEquals(Object lhs, Object rhs, String msg)`  so we have a left hand (lhs) and a right hand side (rhs) of a comparison but was is expected and what is what we got is not defined  .

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PR Comment: https://git.openjdk.org/jdk/pull/17952#issuecomment-1973131407