@Deprecated
    @Restricted(DoNotUse.class)
    public static String resolve(ConfigurationContext context, String toInterpolate) {
        return context.getSecretSourceResolver().resolve(toInterpolate);
    }
@Test
    public void resolve_FileBase64() throws Exception {
        String input = getPath("secret.json").toAbsolutePath().toString();
        String output = resolve("${base64:${readFile:" + input + "}}");
        String decoded = DECODE.lookup(output);
        String content = FILE.lookup(input);
        assertThat(output, equalTo(ENCODE.lookup(content)));
        assertThat(decoded, equalTo(content));
        assertThat(decoded, containsString("\"Our secret\": \"Hello World\""));
    }