@Test
    public void resolve_JsonFromFile() throws Exception {
        String input = getPath("secret.json").toAbsolutePath().toString();
        String output = resolve("${json:Our secret:${file:" + input + "}}");
        assertThat(output, equalTo("Hello World"));
    }
Test a mix of JSON and other lookups
plugin/src/test/java/io/jenkins/plugins/casc/SecretSourceResolverTest.java