test: fix assertions for newer jdks and refactor old test code. #3554
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As i wrote in issue #3547 we have some testcase, which are jdk dependent. Goal of this patch is to fix them all and as always refactor the testcase to reach a higher quality standard. Looking into the older testcases, there is still alot of refactoring work needed unrelated to bugs. I try to create as minimal diffs as possible while still refactoring the code to a newer style.