private String getResourceContent(String resourcePath) throws IOException {
        return IOUtils.toString(getClass().getResourceAsStream(resourcePath), StandardCharsets.UTF_8);
    }
1. Configure the instance with the {@link #configResource()} implemented. 2. Check it was
configured correctly. 3. Check the configuration is valid via Web UI. 4. Apply the
configuration via Web UI. 5. Write the configuration to $JENKINS_HOME/jenkins.yaml. 6.
Restart Jenkins. 7. Check the {@link #stringInLogExpected()} is set during the restart.

@throws IOException If an exception is thrown managing resources or files.
test-harness/src/main/java/io/jenkins/plugins/casc/misc/junit/jupiter/AbstractRoundTripTest.java