Because of https://github.com/jenkinsci/jenkins-test-harness/commit/a07387a5d21b273cfc55305ecc2b193111d47bc0#diff-1d6816bd6f9430280c5d8b7853286b1d tests are failing in windows because of open files.
Let's start by testing the plugin on windows ? https://github.com/jenkinsci/support-core-plugin/pull/202
it's already tested on windows by default. Thus I suppose that we don't yet have the issue because we use an older version jenkins-test-harness Emilio Escobar ?
yes, the change that let us know the bug exists has been introduced in the jenkins-test-harness 2.56 version