@Test
public void testIfFilledAndNotMetrics() throws Exception {

    assertTrue(MetricsInstrumentationInterceptor.isFilledAndNotMetrics("foobar"));
    assertTrue(MetricsInstrumentationInterceptor.isFilledAndNotMetrics("rainbow"));
    assertFalse(MetricsInstrumentationInterceptor.isFilledAndNotMetrics("_metrics"));
    assertFalse(MetricsInstrumentationInterceptor.isFilledAndNotMetrics(""));
    assertFalse(MetricsInstrumentationInterceptor.isFilledAndNotMetrics("  "));
    assertFalse(MetricsInstrumentationInterceptor.isFilledAndNotMetrics(null));
}