@Test
    public void resolve_Json() {
        String input = "{ \"a\": 1, \"b\": 2 }";
        environment.set("FOO", input);
        String output = resolve("${json:a:${FOO}}");
        assertThat(output, equalTo("1"));
    }
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