assertTrue(msg.contains(substring), "\"" + substring + "\" was not found in: " + msg);
    }

    @Test
    void testValidate() {
        Profile prof = Profile.newBuilder().id("xxx").build();
        Settings model = Settings.newBuilder().profiles(List.of(prof)).build();
        List<BuilderProblem> problems = validator.validate(model);
        assertEquals(0, problems.size());