@Test
 void clearTest() {
   final HopscotchCollection<Integer> hopscotchCollection = new HopscotchCollection<>(testVals);
   hopscotchCollection.clear();
   Assert.assertEquals(hopscotchCollection.size(), 0);
   Assert.assertEquals(SVUtils.iteratorSize(hopscotchCollection.iterator()), 0);
 }
 @Test
 void sizeTest() {
   final HopscotchCollection<Integer> hopscotchCollection = new HopscotchCollection<>();
   Assert.assertEquals(hopscotchCollection.size(), 0);
   hopscotchCollection.addAll(testVals);
   Assert.assertEquals(hopscotchCollection.size(), testVals.size());
   hopscotchCollection.add(notInTestVals);
   Assert.assertEquals(hopscotchCollection.size(), testVals.size() + 1);
   hopscotchCollection.removeEach(notInTestVals);
   Assert.assertEquals(hopscotchCollection.size(), testVals.size());
   hopscotchCollection.clear();
   Assert.assertEquals(hopscotchCollection.size(), 0);
 }