### Question:
BaseIntervalSystem extends BaseSystem { protected float getIntervalDelta() { return interval + intervalDelta; } BaseIntervalSystem(float interval); @Override boolean checkProcessing();  }### Answer:
@Test public void test_interval_delta_() { sys = new TestIntervalSystem(1f); createWorld(); world.delta = 1.1f; world.process(); assertEquals(1.1f, sys.getIntervalDelta(), 0.0001f); world.delta = 0.95f; world.process(); assertEquals(0.95f, sys.getIntervalDelta(), 0.0001f); }