@Test
    public void test_that_non_standard_types_are_formatted_as_json_strings() {
        SpecialtypesConfig.Builder builder = new SpecialtypesConfig.Builder();
        builder.myfile("thefilename");
        builder.myref("thereference");

        final SpecialtypesConfig config = new SpecialtypesConfig(builder);
        final String expectedJson = inputJson(
                "{",
                "    'myfile': 'thefilename',",
                "    'myref': 'thereference'",
                "}"
        );

        assertConfigEquals(expectedJson, config);
    }
@author Ulf Lilleengen
@author Vegard Sjonfjell
config/src/test/java/com/yahoo/config/subscription/ConfigInstanceSerializerTest.java