Test the abstract class

Question

Here the problem:

This is the class for which i am trying test case.

In this, First i tried to create instance of ViewHandler(abstract class) i know which is not Possible But for testing i have to use setView(View view).

Here is the my class:

public abstract class ViewHandler extends BOOLog {
protected View view;

protected ViewEntryCollection coll;

protected boolean stopNow = false;

private ViewEntry entry;

protected int position;

protected abstract boolean handleDoc(Document doc);

/**
 * Start handling of view. Calls handleDoc for all documents.
 * 
 * @return True, if view is set and all documents are handled ok.
 */
public boolean start() {

    / contain some code /

    return ok;
}

protected int skip(int count) {

    /*contain some code */

    return count;
}

/**
 * @param view
 *            The view to handle.
 * @throws NotesException
 *             On any Notes error.
 */
public void setView(View view) throws NotesException {
    this.view = view;
    view.refresh();
    this.coll = view.getAllEntries();
}

}

This is my unit test method:

public class TestViewHandler extends InitPropsAndLog {

private static ViewHandler viewhandler;
private static StdLog log;
private static BOOSession ses;

protected View view;

@BeforeClass
public static void initSession() throws Exception {
    assertTrue(Domino.reset());
    DominoProps.initFromProperties();
    log = new StdLog("TestViewHandler", null);
    boolean l = Domino.init(log);
    boolean l1 = DominoProps.isInitialized();
    ses = (BOOSession) Domino.getSession();

 }

/**
 * Test method for
 * {@link de.bcode.domino.ViewHandler#handleDoc(lotus.domino.Document)}.
 * 
 * @throws Exception
 */
@Test
public void testHandleDoc() throws Exception {

        System.out.println(ses.getServerName());
        Database database = ses.getDatabase(ses.getServerName(),
                "test_shree.nsf");

        view = database.getView("form1");
        if (view == null)
            System.out.println("View is null");

        viewHandler.setView(view);
         viewhandler.start();



    }
 }

This the Error:

 java.lang.NullPointerException
at de.bcode.domino.TestViewHandler.testHandleDoc(TestViewHandler.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
 at        org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Thank you for reading all the question :-) Hope it is clear enough.

At which line did this Exception occurred? Could you attach the full trace? — kupsef, May 14 '15 at 11:05
yes i checked this view is not null, i even get all the element from the view by using ViewEntryCollection coll = view.getAllEntries(); int count1 = coll.getCount(); and i am getting count1 = 2 which is right. hence view is not null, — shreeram banne, May 14 '15 at 11:35

score 1 · Answer 1 · edited May 23 '17 at 11:58

1

at de.bcode.domino.TestViewHandler.testHandleDoc(TestViewHandler.java:58)

As you can see the Exception happened at line 58. It is probably that the viewHandler is null, but I can't tell it for sure since you omitted most of the file.

(It does not even have 58 lines.)

Also, have a look at this topic, you should be able to debug this kinds of mistakes by inspecting the trace. It tells you at which line the Exception was thrown.

edited May 23 '17 at 11:58

Community

1
1

answered May 14 '15 at 12:06

kupsef

3,357
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yes i know it is empty because in java we cant Instantiate abstract class, in my case TestViewHandler already extending InitPropsAndLog and to test ViewHandler i must have to create its object and use his method for testing but not possible, – shreeram banne May 15 '15 at 10:39

score 1 · Answer 2 · answered May 15 '15 at 11:08

This solution i found with this i reached to my goal but is there is any efficient :

This is the class i have to test:

 public abstract class ViewHandler 
  {

      public boolean method 1 
        {
          defined;
        }

      protected abstract boolean method 2; (not defined) 
  }

This is my testing class but, which exdending some other class so i created one more class like temp class.

 class temp extends  ViewHandler
  {
       @override 
       public boolean method 1
         {
              defined same as in ViewHandler to test it;

         }

      @override 
      protected abstract boolean method 2
        {  

        }

}

Now to test method 1 and method 2 of viewhandler i done this.

  class testviewHandler extends InitPropsAndLog

  {  

  @Before
   {
   temp t = new temp();
   }

        @Test
        {
            t.method1; // done testing by usning some asserts on it 

        }



  }

Now i am not getting NullPointerExpetion but there is any other efficient way to do achieve this.

Test the abstract class

2 Answers2