如何使用Mockito模拟SharedPreferences

本文介绍了如何使用Mockito模拟SharedPreferences的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我刚刚了解了Android中的单元测试，并且想知道如何在没有任何SharedPreferencesHelper类的情况下模拟SharedPreferences，例如此处

I have just read about Unit Instrumented Testing in Android and I wonder how I can mock a SharedPreferences without any SharedPreferencesHelper class on it like here

我的代码是:

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)mit(); loggedUserData.edit().putString(Constants.USER_TOKEN,token)mit(); } 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)mit(); loggedUserData.edit().remove(Constants.USER_TOKEN)mit(); } 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; }}

是否可以在不创建其他类的情况下模拟SharedPreferences?

Is is possible to mock SharedPreferences without creating other class on it?

推荐答案

因此，由于SharedPreferences来自您的context，因此很容易:

So, because SharedPreferences comes from your context, it's easy:

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

例如，对于getValidToken(Context context)，测试可能是:

for example, for getValidToken(Context context), the test could be:

@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(); }