title: Is it possible to test a method in an Activity class?
body: <p>Everybody recommended to follow MVP or MVVM pattern to maintain code readability and testability. Now I am having doubts. Now I am learning unit testing and I'm writing the code in a formal way. Not using any patterns. Now my question, can I test my code like the following?</p>
  
  <p>My main activity:</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main); 
      }
  
      public boolean testMethod(int value){
         return value== 5?true:false;
      }
  }
  </code></pre>
  
  <p>My unit test class:</p>
  
  <pre><code>@RunWith(MockitoJUnitRunner.class)
  public class ExampleUnitTest {
   MainActivity mainActivity = new MainActivity();
  @Test
      public void testMethod(){
          boolean result = mainActivity.testMethod(5);
          assertEquals(true,result);
      }
  }
  </code></pre>
  
  <p>While running the test I did not receive any errors or issues. So is this the right way to test like this? Or what will happen if I follow this method? I am also starting to migrate my code to the MVP pattern, but I want to clear my doubts. Please let me know the reason why I should not follow the formal coding for unit testing.</p>