Add junit for GrowthListTest(int initialCapacity) (#92)

src/test/java/org/apache/commons/collections4/list/GrowthListTest.java

@@ -44,6 +44,21 @@ public class GrowthListTest<E> extends AbstractListTest<E> {
         return GrowthList.growthList(list);
     }
 
+    //-----------------------------------------------------------------------
+    public void testGrowthList() {
+        final Integer zero = Integer.valueOf(0);
+        final Integer one = Integer.valueOf(1);
+        final Integer two = Integer.valueOf(2);
+        final GrowthList<Integer> grower = new GrowthList(1);
+        assertEquals(0, grower.size());
+        grower.add(0, zero);
+        assertEquals(1, grower.size());
+        grower.add(1, one);
+        assertEquals(2, grower.size());
+        grower.add(2, two);
+        assertEquals(3, grower.size());
+    }
+
     //-----------------------------------------------------------------------
     public void testGrowthAdd() {
         final Integer one = Integer.valueOf(1);