Added Safty methods and test into IObjectArray to reduce crashes.

src/test/java/speiger/src/collections/objects/list/ObjectArrayListTest.java

@@ -0,0 +1,33 @@
+package speiger.src.collections.objects.list;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import speiger.src.collections.objects.lists.ObjectArrayList;
+import speiger.src.collections.objects.utils.IObjectArray;
+
+@SuppressWarnings("javadoc")
+public class ObjectArrayListTest
+{
+	@Test
+	public void testCastable()
+	{
+		ObjectArrayList<String> list = new ObjectArrayList<>();
+		list.add("Test");
+		list.add("Testing");
+		list.add("Testing stuff");
+		testCastable(list, false);
+		testCastable(ObjectArrayList.wrap("Test", "Testing", "Testing stuff"), true);
+	}
+	
+	public <T> void testCastable(IObjectArray<T> castable, boolean result)
+	{
+		Assert.assertTrue(castable.isCastable() == result);
+		AtomicInteger amount = new AtomicInteger();
+		castable.elements(T -> amount.set(T.length));
+		Assert.assertTrue(amount.get() > 0 == result);
+		
+	}
+}