Test results contain wrongly encoded characters when evaluating NUnit test results. Some characters are turned into question marks.
Specifically our test reports contain the following test case and similar ones:
<test-case name="Test.Namespace.TestSuite.SaveAlphaNumericals("Ö")" executed="True" result="Success" success="True" time="5.411" asserts="19"/>
(test name simplified and anonymized)
In the test report view of Jenkins this test case is displayed as:
The special characters are turned to ??.
This happens for all test cases containing special characters like Ä,Ö,Ü or °, so in the test result the cases can't be distinguished anymore.