Android MainActivityTest Example

MainActivityTest.java

package co.uk.myapp.beachroidtest;

import android.app.Fragment;
import android.app.Instrumentation;
import android.test.ActivityInstrumentationTestCase2;
import android.test.TouchUtils;
import android.test.ViewAsserts;
import android.view.View;

public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
  private MainActivity mMainActivity;
  private Instrumentation mInstrumentation;
  private View mSearchButton;
  private View mYourHolidayButton;

  private static int TIMEOUT_IN_MS = 10000;

  public MainActivityTest() {
    super(MainActivity.class);
  }

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

    setActivityInitialTouchMode(true);

    mInstrumentation = getInstrumentation();
    mMainActivity = getActivity();
    mSearchButton = mMainActivity.findViewById(R.id.action_search);
    mYourHolidayButton = mMainActivity.findViewById(R.id.action_your_holiday);
  }

  public void testLoadsDefaultFragment() {
    Fragment fragment = mMainActivity.getFragmentManager()
        .findFragmentById(R.id.hotelResultsFragment);

    assertTrue(fragment instanceof HotelResultsFragment);
  }

  public void testActionBarButtonsExists() {
    View mainActivityDecorView = mMainActivity.getWindow().getDecorView();
    ViewAsserts.assertOnScreen(mainActivityDecorView, mSearchButton);
    ViewAsserts.assertOnScreen(mainActivityDecorView, mYourHolidayButton);
  }

  public void testSearchButtonLoadsSearchActivity() {
    // Set up Activity Monitor
    Instrumentation.ActivityMonitor searchActivityMonitor =
        mInstrumentation.addMonitor(SearchActivity.class.getName(),
            null, false);

    // Click ActionBar Search Icon
    TouchUtils.clickView(this, mSearchButton);

    // Wait for the Activity to Load
    SearchActivity receiverActivity = (SearchActivity)
        searchActivityMonitor.waitForActivityWithTimeout(TIMEOUT_IN_MS);

    // Check the Activity has exists
    assertNotNull("SearchActivity is null", receiverActivity);

    // Check the Activity has loaded
    assertEquals("Monitor for SearchActivity has not been called",
        1, searchActivityMonitor.getHits());

    // Remove the Activity Monitor
    getInstrumentation().removeMonitor(searchActivityMonitor);
  }

  public void testYourHolidayButtonLoadsYourHolidayActivity() {
    // Set up Activity Monitor
    Instrumentation.ActivityMonitor yourHolidayActivityMonitor =
        mInstrumentation.addMonitor(YourHolidayActivity.class.getName(),
            null, false);

    // Click ActionBar Your Holiday Icon
    TouchUtils.clickView(this, mYourHolidayButton);

    // Wait for the Activity to Load
    YourHolidayActivity receiverActivity = (YourHolidayActivity)
        yourHolidayActivityMonitor.waitForActivityWithTimeout(TIMEOUT_IN_MS);

    // Check the Activity has exists
    assertNotNull("YourHolidayActivity is null", receiverActivity);

    // Check the Activity has loaded
    assertEquals("Monitor for YourHolidayActivity has not been called",
        1, yourHolidayActivityMonitor.getHits());

    // Remove the Activity Monitor
    getInstrumentation().removeMonitor(yourHolidayActivityMonitor);
  }
}

Hello,

I do the same in my project and it return a NullPointerException in setUp when I put getActivity() in a variable.

`import android.app.Instrumentation;
import android.content.Intent;
import android.test.ActivityInstrumentationTestCase2;
import android.test.ViewAsserts;
import android.view.View;

import org.junit.Assert;

public class MainActivityTest extends ActivityInstrumentationTestCase2 < MainActivity> {

 private MainActivity activity ;

private Instrumentation instrumentation;
private Instrumentation.ActivityMonitor activityMonitor;
private Intent startIntent;

private View t1;

public MainActivityTest(){
    super(MainActivity.class);
}

public void setUp() throws Exception {
    super.setUp();

    setActivityInitialTouchMode(true);

  activity =  getActivity();

    instrumentation = getInstrumentation();

  t1 = activity.findViewById(R.id.textView);

}

public void testPresence(){

    View origin = activity.getWindow().getDecorView();

    ViewAsserts.assertOnScreen(origin, t1);

}`

did you have any idea?