### Question:
EffectPropertiesValues { public void add(final Attributes p) { values.add(p); }  void add(final Attributes p); @Nonnull List<Attributes> getValues(); @Nullable LinearInterpolator toLinearInterpolator(); boolean containsTimeValues();  }### Answer:
@Test public void testAdd() { Attributes p = new Attributes(); effectValues.add(p); List<Attributes> values = effectValues.getValues(); assertEquals(1, values.size()); assertEquals(p, values.iterator().next()); }