Android InstrumentationTestCase for Network call Demo.

Description: In this post I'm gonna show you how we can create a testcase for our network calls using android InstrumentationTestCase I'm gonna use CoutDownLatch simply becausein most of our app we make network call on background thread. CountDownLatch gives as option to run call single threaded.

So lets get started. :-)

Step 1: Create a class NetworkCallTest extends InstrumentationTestCase within your 'app/src/androidTest/java/<package_name>

Step2: Create any method within the class prefixed as test e.g: testNetworkCall. For serial exceution you can have name as test1,test2,test3 and so on.

Note: test case are event driven if methods are not prefixed with test its not gonna execute.

public void testNetworkCall(){}

Step3: Lets create  a dummy network call for demo using aquery and countdown latch.

public class NetworkCallTest extends InstrumentationTestCase {

    @Override
    public void setUp() throws Exception {
        super.setUp();
    }

    public void testNetworkCall(){
        CountDownLatch countDownLatch = new CountDownLatch(1);
        new Thread(new NetworkRunnable(countDownLatch)).start();
    }

    private class NetworkRunnable implements Runnable {

        private CountDownLatch countDownLatch;

        public NetworkRunnable(CountDownLatch countDownLatch) {
            this.countDownLatch = countDownLatch;
        }

        @Override
        public void run() {

            AQuery aQuery = new AQuery(getInstrumentation().getContext());
            aQuery.ajax( "http://jsonplaceholder.typicode.com/posts" , JSONArray.class , new AjaxCallback<JSONArray>(){
                @Override
                public void callback(String url, JSONArray jsonArray, AjaxStatus status) {

                    assertNotNull("response array  is null", jsonArray);

                    for (int i = 0; i < jsonArray.length(); i++) {

                        JSONObject object = jsonArray.optJSONObject(i);

                        assertNotNull("jsonObject is null", object);

                        String userId = object.optString("userId");
                        assertTrue("User Id is empty" , !TextUtils.isEmpty(userId));

                        String id = object.optString("id");
                        assertTrue("Id is empty" , !TextUtils.isEmpty(id));

                        String title = object.optString("title");
                        assertTrue("title is empty" , !TextUtils.isEmpty(title));

                        String body = object.optString("body");
                        assertTrue("body is empty" , !TextUtils.isEmpty(body));
                    }

                    countDownLatch.countDown();


                }
            });
        }
    }
}

Step4:Run the test case . Click to know HOW TO RUN TESTCASES ?.

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Android:How to find on which thread code is exceuting?

Description:
As we normally say it code is running in “background thread or UI thread”.

Question: How to find on which thread the code is executing?
This article helps to find on which thread the code is executing in Android.

Example:

public static boolean isFromMainThread(){
        return Looper.getMainLooper().getThread().getId() == Thread.currentThread().getId();
  }

Example with thread:
As we say that thread exceute in seperate thread here is the proof:

Thread thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    if (isFromMainThread()) {
                        Log.d("Fetch", " Runnable Executing From Main Thread");
                    } else {
                        Log.d("Fetch", " Runnable Executing From Background Thread");
                    }
                }
            });

thread.start();

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