@Test
    public void resolve_SystemProperty() throws Exception {
        String input = "java.version";
        String expected = System.getProperty(input);
        String output = resolve("${sysProp:" + input + "}");
        assertThat(output, equalTo(SYSPROP.lookup(input)));
        assertThat(output, equalTo(expected));
    }
Ensures that prefixes in the secret ID which are not covered by the CasC protocol substitutors (e.g. base64:, file:)
are left untouched and not removed.
plugin/src/test/java/io/jenkins/plugins/casc/SecretSourceResolverTest.java