Example_MainActivityUnitTest

MainActivityUnitTest.java

@RunWith(AndroidJUnit4.class)
@LargeTest
class MainActivityUnitTest{
  
  @Before
  public void setup(){
    ...
  }

  @Test
  public void calculateSomeValue_case_1(int value){
    
    activity.calculateSomeValue(10);
    
    assertThat( activity.getFinalResult(), is(equalTo(20)));
    ...
  }
  @Test
  public void calculateSomeValue_case_2(int value){
    
    activity.calculateSomeValue(0);
    
    assertThat( activity.getFinalResult(), is(equalTo(5)));
    ...
  }
  @Test
  public void calculateSomeValue_case_3(int value){
    
    activity.calculateSomeValue(-10);
    
    assertThat( activity.getFinalResult(), is(equalTo(10)));
    ...
  }
  
  @Test
  public void clickGotoSecondActivity(){
    
    activity.clickGotoSecondActivity();
   
    // test view logic
    ...
  }
  
  @Test
  public void showLoading(){
    activity.showLoading();
   
    // test view logic
    ...
  }
  
  @Test
  public void hideLoading(){
   activity.showLoading();
   
    // test view logic
    ...
  }
}