### Question:
FastPropertiesImpl implements FastProperties { @Override public String getFastLabel(final String label) { return FAST + " " + label; }  @Override final List<String> getFastProperties(); @Override final List<String> getFastProperties(final String indexConfigFlagPropertyName); @Override final List<String> getFastProperties(final List<String> indexConfigFlagPropertyNames); List<String> getDeltaProperties(final Collection<String> fastProperties, final Collection<String> otherProperties); @Override String getFastLabel(final String label); @Override String getSlowLabel(final String label);  }### Answer:
@Test public void getFastLabel() { final FastProperties fastProperties = ctx.getService(FastProperties.class); final String expected = FastProperties.FAST + " I'm a fast property"; final String actual = fastProperties.getFastLabel("I'm a fast property"); assertEquals(expected, actual); }