android unit and UI testing sample using Mockito, Espresso and Dagger2

1. Android Testing
Evan Lin
at
evan.lin@getloopd.com

2. Tools
• Mock -> Mockito
• http://mockito.org/
• UI Testing -> Espresso
• https://developer.android.com/training/testing/ui-testing/espresso-testing.html
• Dependency Injection -> Dagger2
• http://google.github.io/dagger/

3. Mockito
dependencies {
...
// Mockito
debugCompile 'org.mockito:mockito-core:1.10.19'
debugCompile 'com.google.dexmaker:dexmaker:1.2'
debugCompile ‘com.google.dexmaker:dexmaker-mockito:1.2'
}

4. Espresso
android {
defaultConfig {
...
// Espresso2
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
}
dependencies {
...
// Espresso2
androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2'
androidTestCompile ‘com.android.support.test:runner:0.3'
}

5. Dagger2
// dagger2
apply plugin: 'com.neenbedankt.android-apt'
buildscript {
repositories {
jcenter()
}
dependencies {
// dagger2
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
}
}
dependencies {
...
// dagger2
compile 'junit:junit:4.12'
compile 'com.google.dagger:dagger:2.0'
apt 'com.google.dagger:dagger-compiler:2.0'
provided 'org.glassfish:javax.annotation:10.0-b28'
}

6. Start

8. public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
EditText mEmailEditText;
EditText mPasswordEditText;
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
public void onEnterButtonClick() {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}

9. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
}
public void onEnterButtonClick() {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

10. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

11. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

12. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

14. Keep Signin

15. public class UserService {
...
public boolean isLogin() {
return loadLoginStatus();
}
public boolean login(String email, String password) {
if (checkEmailAndPassword(email, password)) {
saveLoginStatus(true);
return true;
} else {
return false;
}
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
...
}

16. public class UserService {
...
public boolean isLogin() {
return loadLoginStatus();
}
public boolean login(String email, String password) {
if (checkEmailAndPassword(email, password)) {
saveLoginStatus(true);
return true;
} else {
return false;
}
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
...
}

17. public class UserService {
...
public boolean isLogin() {
return loadLoginStatus();
}
public boolean login(String email, String password) {
if (checkEmailAndPassword(email, password)) {
saveLoginStatus(true);
return true;
} else {
return false;
}
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
...
}

18. public class UserService {
private PasswordValidator mPasswordValidator;
...
public boolean isLogin() {
return loadLoginStatus();
}
public boolean login(String email, String password) {
if (mPasswordValidator.checkEmailAndPassword(email, password)) {
saveLoginStatus(true);
return true;
} else {
return false;
}
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
...
}

19. public class PasswordValidator {
public boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
}

20. public class UserService {
public static final String SHARED_PREF_NAME = "MY_SHARED_PREF";
private static final String SHARED_PREF_KEY_IS_LOGIN = “SHARED_PREF_KEY_IS_LOGIN";
private PasswordValidator mPasswordValidator;
private SharedPreferences mSharedPreferences;
public UserService(Context appContext, PasswordValidator validator) {
mPasswordValidator = validator;
mSharedPreferences = appContext.getSharedPreferences(SHARED_PREF_NAME, 0);
}
...
private boolean loadLoginStatus() {
return mSharedPreferences.getBoolean(SHARED_PREF_KEY_IS_LOGIN, false);
}
private void saveLoginStatus(boolean isLogin) {
SharedPreferences.Editor editor = mSharedPreferences.edit();
editor.putBoolean(SHARED_PREF_KEY_IS_LOGIN, isLogin);
editor.commit();
}
}

21. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

22. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
mUserService = new UserService(getApplicationContext(), new PasswordValidator());
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

23. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
mUserService = new UserService(getApplicationContext(), new PasswordValidator());
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
if (checkEmailAndPassword(email, password))
goToSecondPage();
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

24. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
mUserService = new UserService(getApplicationContext(), new PasswordValidator());
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
boolean isLoginSuccess = mUserService.login(email, password);
if (isLoginSuccess)
goToSecondPage();
}
private void goToSecondPage() {
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
}

25. public class MainActivity extends Activity {
EditText mEmailEditText;
EditText mPasswordEditText;
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
mUserService = new UserService(getApplicationContext(), new PasswordValidator());
if (checkAutoLogin()) {
goToSecondPage();
finish();
}
}
private boolean checkAutoLogin() {
return mUserService.isLogin();
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
boolean isLoginSuccess = mUserService.login(email, password);
if (isLoginSuccess)
goToSecondPage();
}
...

26. First Time
Open App
Second Time
Open App

27. Time to Test

28. Unit Test

29. 1.
2.
3.

30. public class UserServiceTest extends TestCase {
}

31. public class UserServiceTest extends TestCase {
public void testLoginSuccess() throws Exception {
// arrange
// act
// assert
}
}

32. public class UserServiceTest extends TestCase {
public void testLoginSuccess() throws Exception {
// arrange
// act
// assert
}
}
test method prefix

33. public class UserServiceTest extends TestCase {
public void testLoginSuccess() throws Exception {
// arrange
// act
// assert
}
}

34. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = new PasswordValidator();
UserService userService = new UserService(getContext(), validator);
// act
// assert
}
}

35. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = new PasswordValidator();
UserService userService = new UserService(getContext(), validator);
// act
userService.login("admin", "admin");
// assert
assertTrue(userService.isLogin());
}
}

36. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = Mockito.mock(PasswordValidator.class);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("admin", "admin");
// assert
assertTrue(userService.isLogin());
}
}

37. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = Mockito.mock(PasswordValidator.class);
Mockito.when(validator.checkEmailAndPassword(Matchers.anyString(),
Matchers.anyString())).thenReturn(true);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("admin", "admin");
// assert
assertTrue(userService.isLogin());
}
}

38. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = Mockito.mock(PasswordValidator.class);
Mockito.when(validator.checkEmailAndPassword(Matchers.anyString(),
Matchers.anyString())).thenReturn(true);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertTrue(userService.isLogin());
}
}

39. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = Mockito.mock(PasswordValidator.class);
Mockito.when(validator.checkEmailAndPassword(Matchers.anyString(),
Matchers.anyString())).thenReturn(true);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertTrue(userService.isLogin());
}
}

40. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = mock(PasswordValidator.class);
when(validator.checkEmailAndPassword(anyString(),
anyString())).thenReturn(true);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertTrue(userService.isLogin());
}
public void testLoginFailure() throws Exception {
// arrange
PasswordValidator validator = mock(PasswordValidator.class);
when(validator.checkEmailAndPassword(anyString(),
anyString())).thenReturn(false);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertFalse(userService.isLogin());
}
}

41. public class UserServiceTest extends AndroidTestCase {
public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = mock(PasswordValidator.class);
when(validator.checkEmailAndPassword(anyString(),
anyString())).thenReturn(true);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertTrue(userService.isLogin());
}
public void testLoginFailure() throws Exception {
// arrange
PasswordValidator validator = mock(PasswordValidator.class);
when(validator.checkEmailAndPassword(anyString(),
anyString())).thenReturn(false);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertFalse(userService.isLogin());
}
}

42. • passed when running separately(sometimes?)

43. • passed when running separately(sometimes?)
• but failed running the whole tests

44. • passed when running separately(sometimes?)
• but failed running the whole tests
• WHY?

45. public boolean isLogin() {
return loadLoginStatus();
}
public boolean login(String email, String password) {
if (mPasswordValidator.checkEmailAndPassword(email, password)) {
saveLoginStatus(true);
return true;
} else {
return false;
}
}
private boolean loadLoginStatus() {
return mSharedPreferences.getBoolean(SHARED_PREF_KEY_IS_LOGIN, false);
}
private void saveLoginStatus(boolean isLogin) {
SharedPreferences.Editor editor = mSharedPreferences.edit();
editor.putBoolean(SHARED_PREF_KEY_IS_LOGIN, isLogin);
editor.commit();
}

46. public class UserServiceTest extends AndroidTestCase {
public void setUp() throws Exception {
super.setUp();
clearSharedPref();
}
private void clearSharedPref() {
getContext().getSharedPreferences(UserService.SHARED_PREF_NAME, 0)
.edit().clear().commit();
}
...

47. Works!!

48. Async Tasks

49. public class PasswordValidator {
public boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
}

50. public class PasswordValidator {
public boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
}
public class UserApiService {
public void login(String email, String password, Callback callback) {
// todo: send login request to server...
}
public interface Callback {
void onSuccess();
void onFailure();
}
}

51. public class UserApiService {
public void login(String email, String password, Callback callback) {
// todo: send login request to server...
}
public interface Callback {
void onSuccess();
void onFailure();
}
}

52. public class UserApiService {
public void login(String email, String password, Callback callback) {
if (checkEmailAndPassword(email, password))
wait2SecondsAndRespondSuccess(callback);
}
private boolean checkEmailAndPassword(String email, String password) {
return email.equals("admin") && password.equals("admin");
}
private void wait2SecondsAndRespondSuccess(final Callback callback) {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
callback.onSuccess();
}
}, 2000);
}
public interface Callback {
void onSuccess();
void onFailure();
}
}

53. public class UserService {
private PasswordValidator mPasswordValidator;
...
public UserService(Context appContext, PasswordValidator validator) {
mPasswordValidator = validator;
...
}
public boolean login(String email, String password) {
if (mPasswordValidator.checkEmailAndPassword(email, password)) {
saveLoginStatus(true);
return true;
} else {
return false;
}
}
...
}

54. public class UserService {
private UserApiService mUserApiService;
...
public UserService(Context appContext, UserApiService userApiService) {
mUserApiService = userApiService;
...
}
public void login(String email, String password, final Callback callback) {
mUserApiService.login(email, password, new Callback() {
@Override
public void onSuccess() {
saveLoginStatus(true);
callback.onSuccess();
}
@Override
public void onFailure() {
callback.onFailure();
}
});
}
...

55. public class MainActivity extends Activity {
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
mUserService = new UserService(getApplicationContext(), new PasswordValidator());
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
boolean isLoginSuccess = mUserService.login(email, password);
if (isLoginSuccess)
goToSecondPage();
}
...

56. public class MainActivity extends Activity {
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEmailEditText = (EditText) findViewById(R.id.email);
mPasswordEditText = (EditText) findViewById(R.id.password);
mUserService = new UserService(getApplicationContext(), new UserApiService());
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}
...

57. Unit Test

58. public void testLoginSuccess() throws Exception {
// arrange
PasswordValidator validator = mock(PasswordValidator.class);
when(validator.checkEmailAndPassword(anyString(),
anyString())).thenReturn(true);
UserService userService = new UserService(getContext(), validator);
// act
userService.login("whateverEmail", "whateverPassword");
// assert
assertTrue(userService.isLogin());
}

59. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}

60. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}

61. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}

62. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}

63. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}

64. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}

65. public void testLoginSuccess() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertTrue(userService.isLogin());
}
public void testLoginFailure() throws Exception {
// arrange
UserApiService userApiService = mock(UserApiService.class);
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
Callback callback = (Callback) invocation.getArguments()[2];
callback.onFailure();
return null;
}
}).when(userApiService).login(anyString(), anyString(), any(Callback.class));
UserService userService = new UserService(getContext(), userApiService);
// act
userService.login("whateverEmail", "whateverPassword", mock(Callback.class));
// assert
assertFalse(userService.isLogin());
}

66. Works!!

67. UI Test

68. 1.
2.
3.
public class MainActivityTest extends TestCase {
}

69. public class MainActivityTest extends TestCase {
}

70. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
public MainActivityTest() {
super(MainActivity.class);
}
}

71. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
public MainActivityTest() {
super(MainActivity.class);
}
public void setUp() throws Exception {
super.setUp();
clearSharedPref();
getActivity();
}
private void clearSharedPref() {
getInstrumentation().getTargetContext().getSharedPreferences
(UserService.SHARED_PREF_NAME, 0).edit().clear().commit();
}
}

72. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
Espresso.onView(ViewMatchers.withId(R.id.email))
.check(ViewAssertions.matches(ViewMatchers.isDisplayed()));
Espresso.onView(ViewMatchers.withId(R.id.password))
.check(ViewAssertions.matches(ViewMatchers.isDisplayed()));
Espresso.onView(ViewMatchers.withId(R.id.enter_button))
.check(ViewAssertions.matches(ViewMatchers.isDisplayed()));
}
}

73. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
Espresso.onView(ViewMatchers.withId(R.id.email))
.check(ViewAssertions.matches(ViewMatchers.isDisplayed()));
Espresso.onView(ViewMatchers.withId(R.id.password))
.check(ViewAssertions.matches(ViewMatchers.isDisplayed()));
Espresso.onView(ViewMatchers.withId(R.id.enter_button))
.check(ViewAssertions.matches(ViewMatchers.isDisplayed()));
}
}

74. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
onView(withId(R.id.email))
.check(matches(isDisplayed()));
onView(withId(R.id.password))
.check(matches(isDisplayed()));
onView(withId(R.id.enter_button))
.check(matches(isDisplayed()));
}
}

75. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
onView(withId(R.id.email))
.check(matches(isDisplayed()));
onView(withId(R.id.password))
.check(matches(isDisplayed()));
onView(withId(R.id.enter_button))
.check(matches(isDisplayed()));
}
}

76. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
onView(withId(R.id.email))
.check(matches(isDisplayed()));
onView(withId(R.id.password))
.check(matches(isDisplayed()));
onView(withId(R.id.enter_button))
.check(matches(isDisplayed()));
}
}

77. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
onView(withId(R.id.email))
.check(matches(isDisplayed()));
onView(withId(R.id.password))
.check(matches(isDisplayed()));
onView(withId(R.id.enter_button))
.check(matches(isDisplayed()));
}
}

78. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLayout() throws Exception {
// arrange
// act
// assert
onView(withId(R.id.email))
.check(matches(isDisplayed()));
onView(withId(R.id.password))
.check(matches(isDisplayed()));
onView(withId(R.id.enter_button))
.check(matches(isDisplayed()));
}
} Works!!

79. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(ViewMatchers.withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(ViewMatchers.withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(ViewMatchers.withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

80. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(ViewMatchers.withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(ViewMatchers.withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

81. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(ViewMatchers.withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

82. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

83. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

84. public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

85. after doing some research…

86. use Dagger2 for Dependency Injection

87. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}

88. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}

89. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}
@Provides
@Singleton
UserService provideUserService(UserApiService userApiService){
return new UserService(mAppContext, userApiService);
}
release

90. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}
@Provides
@Singleton
UserService provideUserService(UserApiService userApiService){
return new UserService(mAppContext, userApiService);
}
release

91. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
@Provides
@Singleton
UserService provideUserService(UserApiService userApiService){
return new UserService(mAppContext, userApiService);
}
debug

92. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
@Provides
@Singleton
UserService provideUserService(UserApiService userApiService){
return new UserService(mAppContext, userApiService);
}
debug

93. public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {
String email = mEmailEditText.getText().toString();
String password = mPasswordEditText.getText().toString();
mUserService.login(email, password, new UserApiService.Callback() {
@Override
public void onSuccess() {
goToSecondPage();
}
@Override
public void onFailure() {
}
});
}
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
@Provides
@Singleton
UserService provideUserService(UserApiService userApiService){
return new UserService(mAppContext, userApiService);
}
debug
Keep Instance

94.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}

95.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}

96.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}
public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {

97.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
Keep Instance
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}
public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {

98.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
Keep Instance
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}
public class MainActivity extends AppCompatActivity {
...
@Inject
UserService mUserService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
UserServiceComponent.Initializer.init(getApplicationContext()).inject(this);
...
}
public void onEnterButtonClick(View view) {

99.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
Keep Instance
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}

100.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
Keep Instance
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}
public class MainActivityTestCase extends ActivityInstrumentationTestCase2<MainActivity> {
@Inject
protected UserService mMockUserService;
public MainActivityTestCase() {
super(MainActivity.class);
}
}

101.
@Provides
@Singleton
UserService provideTestUserService(UserApiService userApiService){
return mMockUserService;
}
Keep Instance
public class MainActivityTest extends MainActivityTestCase {
public void setUp() throws Exception {
super.setUp();
getActivity();
UserServiceComponent.Initializer.getInstance().inject(this);
}
public class MainActivityTestCase extends ActivityInstrumentationTestCase2<MainActivity> {
@Inject
protected UserService mMockUserService;
public MainActivityTestCase() {
super(MainActivity.class);
}
}

102. public class MainActivityTest extends MainActivityTestCase {
...
public void testLoginSuccess() throws Exception {
// arrange
// act
onView(ViewMatchers.withId(R.id.email))
.perform(typeText("whateverEmail"));
onView(ViewMatchers.withId(R.id.password))
.perform(typeText("whateverPassword"));
onView(ViewMatchers.withId(R.id.enter_button))
.perform(click());
// assert
onView(withText("Second Page"))
.check(matches(isDisplayed()));
}
}

103. public class MainActivityTest extends MainActivityTestCase {
...
public void testLoginSuccess() throws Exception {
// arrange
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
UserApiService.Callback callback = (UserApiService.Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(mMockUserService).login(anyString(), anyString(), any(UserApiService.Callback.class));
// act
onView(withId(R.id.email))
.perform(ViewActions.typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(ViewActions.typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(ViewActions.click());
// assert
onView(withText("Second Page"))
.check(ViewAssertions.matches(isDisplayed()));
}
...

104. public class MainActivityTest extends MainActivityTestCase {
...
public void testLoginSuccess() throws Exception {
// arrange
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
UserApiService.Callback callback = (UserApiService.Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(mMockUserService).login(anyString(), anyString(), any(UserApiService.Callback.class));
// act
onView(withId(R.id.email))
.perform(ViewActions.typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(ViewActions.typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(ViewActions.click());
// assert
onView(withText("Second Page"))
.check(ViewAssertions.matches(isDisplayed()));
}
...

105. public class MainActivityTest extends MainActivityTestCase {
...
public void testLoginSuccess() throws Exception {
// arrange
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
UserApiService.Callback callback = (UserApiService.Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(mMockUserService).login(anyString(), anyString(), any(UserApiService.Callback.class));
// act
onView(withId(R.id.email))
.perform(ViewActions.typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(ViewActions.typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(ViewActions.click());
// assert
onView(withText("Second Page"))
.check(ViewAssertions.matches(isDisplayed()));
}
...

106. public class MainActivityTest extends MainActivityTestCase {
...
public void testLoginSuccess() throws Exception {
// arrange
doAnswer(new Answer() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
UserApiService.Callback callback = (UserApiService.Callback) invocation.getArguments()[2];
callback.onSuccess();
return null;
}
}).when(mMockUserService).login(anyString(), anyString(), any(UserApiService.Callback.class));
// act
onView(withId(R.id.email))
.perform(ViewActions.typeText("whateverEmail"));
onView(withId(R.id.password))
.perform(ViewActions.typeText("whateverPassword"));
onView(withId(R.id.enter_button))
.perform(ViewActions.click());
// assert
onView(withText("Second Page"))
.check(ViewAssertions.matches(isDisplayed()));
}
...
Works!!

108. • sometimes failed
• static variable
• local storage
• not easy to test all stuff
• no a best way you can follow
frequent problems

109. • Pattern (MVP, DI)
• Structure
• follow up the android geeks
what I learned

110. • mock object called when activity onCreate
• UI testing for a fragment with interaction with
certain activity
• find out the best test sturcture
still need to figure out

111. • https://github.com/proevan/android-testing-sample