Testing non-activity classes in Android

问题:

I know how to test Activity classes with JUnit 4 in Android but I am unable to understand how to test non-activity classes (which don't extends Activity, ListActivity, or some other Activity class, but uses some Android APIs). Please help me in this regard.

回答1:

To test non activity classes:

1. create a test project
2. create a test case

3. run as Android JUnit Test

   public class MyClassTests extends TestCase {
   
   /**
    * @param name
    */
   public myClassTests(String name) {
       super(name);
   }
   
   /* (non-Javadoc)
    * @see junit.framework.TestCase#setUp()
    */
   protected void setUp() throws Exception {
       super.setUp();
               }
   
   /* (non-Javadoc)
    * @see junit.framework.TestCase#tearDown()
    */
   protected void tearDown() throws Exception {
       super.tearDown();
   }
   
   /**
    * Test something
    */
   public final void testSomething() {
               fail("Not implemented yet");
       }
   }
   

回答2:

The Android SDK includes JUnit. In fact, the Android test classes such as AndroidTestCase and InstrumentationTestCase inherit from junit.framework.TestCase. This means that you can use a standard JUnit test case to test a non-Activity class and include it in Android Projects.

For example, you can create an Android Project with a simple class to test:

public class MyClass {
    public static int getOne() {
        return 1;
    }
}

and an Android Test Project with a standard JUnit test to test this class:

public class TestMyClass extends TestCase {

  public void testMyClass() {
      assertEquals(1, MyClass.getOne());
  }
}

and run this on an Android device or on the Android emulator.

More information after seeing clarification of question in the comments:

AndroidTestCase or other Android test classes can be used to test non-Activity classes which need access to the rest of the Android framework (with a dummy activity provided in the setUp() if necessary). These give you access to a Context if you need to, for example, bind to a service.