Added tests for lazy-loading pattern

lazy-loading/src/test/java/com/iluwatar/lazy/loading/HolderThreadSafeTest.java

@@ -1,45 +1,26 @@
 package com.iluwatar.lazy.loading;
 
-import org.junit.Test;
-
 import java.lang.reflect.Field;
 
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-
 /**
- * Using reflection this test shows that the heavy field is not instantiated until the method
- * getHeavy is called
+ * Date: 12/19/15 - 12:19 PM
  *
- * Created by jones on 11/10/2015.
+ * @author Jeroen Meulemeester
  */
-public class HolderThreadSafeTest {
+public class HolderThreadSafeTest extends AbstractHolderTest {
 
-  @Test
-  public void test() throws IllegalAccessException {
-    HolderThreadSafe hts = new HolderThreadSafe();
+  private final HolderThreadSafe holder = new HolderThreadSafe();
 
-    {
-      // first call is null
-      Field[] ff = HolderThreadSafe.class.getDeclaredFields();
-      for (Field f : ff) {
-        f.setAccessible(true);
-      }
-
-      assertNull(ff[0].get(hts));
-    }
-
-    // now it is lazily loaded
-    hts.getHeavy();
-
-    {
-      // now it is not null - call via reflection so that the test is the same before and after
-      Field[] ff = HolderThreadSafe.class.getDeclaredFields();
-      for (Field f : ff) {
-        f.setAccessible(true);
-      }
-
-      assertNotNull(ff[0].get(hts));
-    }
+  @Override
+  Heavy getInternalHeavyValue() throws Exception {
+    final Field holderField = HolderThreadSafe.class.getDeclaredField("heavy");
+    holderField.setAccessible(true);
+    return (Heavy) holderField.get(this.holder);
   }
-}
+
+  @Override
+  Heavy getHeavy() throws Exception {
+    return this.holder.getHeavy();
+  }
+
+}