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:

SaveAlphaNumericals("??")

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.