Come prendere in giro uno SharedPreferences utilizzando Mockito

Question

Ho appena letto su Unit Instrumented Test in Android e mi chiedo come posso prendere in giro uno SharedPreferences senza alcuna classe SharedPreferencesHelper su di esso come here

il mio codice è:

public class Auth { 
private static SharedPreferences loggedUserData = null; 
public static String getValidToken(Context context) 
{ 
    initLoggedUserPreferences(context); 
    String token = loggedUserData.getString(Constants.USER_TOKEN,null); 
    return token; 
} 
public static String getLoggedUser(Context context) 
{ 
    initLoggedUserPreferences(context); 
    String user = loggedUserData.getString(Constants.LOGGED_USERNAME,null); 
    return user; 
} 
public static void setUserCredentials(Context context, String username, String token) 
{ 
    initLoggedUserPreferences(context); 
    loggedUserData.edit().putString(Constants.LOGGED_USERNAME, username).commit(); 
    loggedUserData.edit().putString(Constants.USER_TOKEN,token).commit(); 
} 

public static HashMap<String, String> setHeaders(String username, String password) 
{ 
    HashMap<String, String> headers = new HashMap<String, String>(); 
    String auth = username + ":" + password; 
    String encoding = Base64.encodeToString(auth.getBytes(), Base64.DEFAULT); 
    headers.put("Authorization", "Basic " + encoding); 
    return headers; 
} 

public static void deleteToken(Context context) 
{ 
    initLoggedUserPreferences(context); 
    loggedUserData.edit().remove(Constants.LOGGED_USERNAME).commit(); 
    loggedUserData.edit().remove(Constants.USER_TOKEN).commit(); 
} 

public static HashMap<String, String> setHeadersWithToken(String token) { 
    HashMap<String, String> headers = new HashMap<String, String>(); 
    headers.put("Authorization","Token "+token); 
    return headers; 
} 
private static SharedPreferences initLoggedUserPreferences(Context context) 
{ 
    if(loggedUserData == null) 
     loggedUserData = context.getSharedPreferences(Constants.LOGGED_USER_PREFERENCES,0); 
    return loggedUserData; 
}} 

È possibile simulare SharedPreferences senza creare altre classi su di esso?

Answer 1

Quindi, perché SharedPreferences viene dal vostro context, è facile:

final SharedPreferences sharedPrefs = Mockito.mock(SharedPreferences.class); 
final Context context = Mockito.mock(Context.class); 
Mockito.when(context.getSharedPreferences(anyString(), anyInt()).thenReturn(sharedPrefs); 

// no use context 

per esempio, per getValidToken(Context context), il test potrebbe essere:

@Before 
public void before() throws Exception { 
    this.sharedPrefs = Mockito.mock(SharedPreferences.class); 
    this.context = Mockito.mock(Context.class); 
    Mockito.when(context.getSharedPreferences(anyString(), anyInt())).thenReturn(sharedPrefs); 
} 

@Test 
public void testGetValidToken() throws Exception { 
    Mockito.when(sharedPrefs.getString(anyString(), anyString())).thenReturn("foobar"); 
    assertEquals("foobar", Auth.getValidToken(context)); 
    // maybe add some verify(); 
}