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/RoundTripAbstractTest.java