在为Espresso测试创建活动之前更改共享首选项

import android.content.SharedPreferences;
import androidx.test.platform.app.InstrumentationRegistry;
import androidx.test.rule.ActivityTestRule;

public class ExampleInstrumentedTest {

    @Rule
    public ActivityTestRule<MainActivity> mActivityRule = new ActivityTestRule<>(MainActivity.class);

    @Before
    public void setUp() {
        // 在测试开始前设置共享首选项
        setSharedPreferences();
    }

    private void setSharedPreferences() {
        SharedPreferences sharedPreferences = InstrumentationRegistry.getInstrumentation()
                .getTargetContext()
                .getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("key_username", "testUser");
        editor.putBoolean("key_isLoggedIn", true);
        editor.apply();
    }

    @Test
    public void checkIfUserIsLoggedIn() {
        // 测试逻辑，检查UI是否显示用户已登录的状态
    }
}