The document discusses Android testing tools and provides code examples for implementing user authentication using those tools. It recommends Mockito for mocking, Espresso for UI testing, and Dagger for dependency injection. It then shows how to create a UserService class using Dagger dependency injection to handle user authentication via shared preferences. The code is refactored over multiple sections to introduce these tools and improvements like validating the password and keeping the user signed in.

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