一些Robolectric测试在一起运行时失败但是单独通过

Question

我在Android Studio 1.2,Robolectric 3.0-rc2上.

我有两个测试类,一个调用MotdTest一个测试方法,测试POJO json序列化和反序列化.调用另一个UserInfoTest,其中包含4个测试方法,用于测试我设置的用户信息SharedPreferences.如果我UserInfoTest单独运行,所有4种测试方法总是通过.但是,如果我运行所有测试,测试MotdTest成功,但两种方法UserInfoTest总是失败.我正在通过调用从命令行运行./gradlew test

当我运行所有测试时,有谁知道为什么我的一些测试失败了？在我的UserInfoTest中,我确实有一个带@After注释的方法,我通过调用clear().commit()来清理它SharedPreferences.Editor.

UserInfoTest:

testOnSignIn()assertThat(6, equalTo(prefs.getAll().size()));因为大小prefs为0 而失败.

并且testIsSignedIn()失败了assertThat(UserInfo.isSignedIn(), is(false));

@RunWith(MyRoboRunner.class)
@Config(constants = BuildConfig.class)
public class UserInfoTest {

    private String mExpectedId;

    private String mExpectedName;

    private String mExpectedEmail;

    private String mExpectedToken;

    private String mExpectedKey;

    @Before
    public void setUp() throws Exception {
        ShadowLog.stream = System.out;

        mExpectedId = "someiD";
        mExpectedName = "johnny boy";
        mExpectedEmail = "some@email.com";
        mExpectedToken = "Session Token";
        mExpectedKey = "Session Key";
    }

    @After
    public void tearDown() {
        SharedPreferences prefs = RuntimeEnvironment.application.getSharedPreferences(
                UserInfo.PREFERENCES, Context.MODE_PRIVATE);
        prefs.edit().clear().commit();
        mExpectedId = null;
        mExpectedName = null;
        mExpectedEmail = null;
        mExpectedToken = null;
        mExpectedKey = null;
    }

    @Test
    public void testOnSignIn() {        
        SharedPreferences prefs = RuntimeEnvironment.application.getSharedPreferences(
                UserInfo.PREFERENCES, Context.MODE_PRIVATE);

        UserInfo.onSignIn(mExpectedId, mExpectedName, mExpectedEmail, mExpectedKey, mExpectedToken);
        assertThat(mExpectedKey, equalTo(UserInfo.getSessionKey()));

        assertThat(mExpectedToken, equalTo(UserInfo.getSessionToken()));
        assertThat(mExpectedId, equalTo(UserInfo.getUserId()));
        assertThat(mExpectedEmail, equalTo(UserInfo.getUserEmail()));
        assertThat(mExpectedName, equalTo(UserInfo.getUserName()));

        assertThat(6, equalTo(prefs.getAll().size()));
    }

    @Test
    public void testOnSignOut() {
        UserInfo.onSignIn(mExpectedId, mExpectedName, mExpectedEmail, mExpectedKey, mExpectedToken);
        // Set Over21 to make sure we unset this value on Signout
        UserInfo.setIsOver21(true);

        UserInfo.onSignOut();
        SharedPreferences prefs = RuntimeEnvironment.application.getSharedPreferences(
                UserInfo.PREFERENCES, Context.MODE_PRIVATE);
        assertThat(UserInfo.getSessionKey(), nullValue());
        assertThat(UserInfo.getSessionToken(), nullValue());
        assertThat(UserInfo.isOver21Set(), is(false));
        assertThat(prefs.getAll().size(), equalTo(0));
    }

    @Test
    public void testIsSignedIn() {
        assertThat(UserInfo.isSignedIn(), is(false));

        UserInfo.onSignIn(mExpectedId, mExpectedName, mExpectedEmail, mExpectedKey, mExpectedToken);
        assertThat(UserInfo.isSignedIn(), is(true));

        UserInfo.onSignOut();
        assertThat(UserInfo.isSignedIn(), is(false));
    }

    @Test
    public void testIsOver21Set() {
        assertThat(UserInfo.isOver21Set(), is(false));
        UserInfo.setIsOver21(false);
        assertThat(UserInfo.isOver21Set(), is(true));
    }
}

用户信息:

App是一个Application子类,App.getInstance()是一个单例.

private static final SharedPreferences PREFS = App.getInstance()
        .getSharedPreferences(PREFERENCES, Context.MODE_PRIVATE);

public static void onSignIn(String userId, String fullName, String email, String sessionKey,
        String sessionToken) {
    SharedPreferences.Editor editor = PREFS.edit();
    editor.putString(PROPERTY_USER_ID, userId);
    editor.putString(PROPERTY_USER_NAME, fullName);
    editor.putString(PROPERTY_USER_EMAIL, email);
    editor.putString(PROPERTY_SESSION_KEY, sessionKey);
    editor.putString(PROPERTY_SESSION_TOKEN, sessionToken);
    editor.putStringSet(PROPERTY_PENDING_SCANS, new HashSet<String>());

    editor.commit();
}
public static boolean isSignedIn() {
    return getSessionToken() != null;
}

MyRoboRunner:这是一个修改过的版本因为我在Mac上,而且因为我在我的项目中瞄准API 22,但是robolectric还不支持,所以我针对API 21运行我的测试.

public class MyRoboRunner extends RobolectricGradleTestRunner {

    public MyRoboRunner(Class<?> klass) throws InitializationError {
        super(klass);
    }

    protected AndroidManifest getAppManifest(Config config) {
        AndroidManifest appManifest = super.getAppManifest(config);
        String moduleRoot = getModuleRootPath(config);

        //can use this line instead dynamic path resolution when AS bug is fix, or use @Config
        //FsFile androidManifestFile = appManifest.getAndroidManifestFile();
        FsFile androidManifestFile = FileFsFile.from(moduleRoot,
                appManifest.getAndroidManifestFile().getPath()
                        .replace("bundles", "manifests/full"));
        FsFile resDirectory = FileFsFile.from(moduleRoot, appManifest.getResDirectory().getPath());
        FsFile assetsDirectory = FileFsFile
                .from(moduleRoot, appManifest.getAssetsDirectory().getPath());
        return new AndroidManifest(androidManifestFile, resDirectory, assetsDirectory) {
            @Override
            public int getTargetSdkVersion() {
                //lollipop bc it's highest that robolectric 3.0 supports
                return Build.VERSION_CODES.LOLLIPOP;
            }

            @Override
            public int getMinSdkVersion() {
                return Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1;
            }
        };
    }

    private String getModuleRootPath(Config config) {
        String moduleRoot = config.constants().getResource("").toString().replace("file:", "");
        return moduleRoot.substring(0, moduleRoot.indexOf("/build"));
    }
}

Answer 1

使用robolectric gradle 插件并设置此属性使我的所有测试都通过了：

robolectric {
    // Specify max number of processes (default is 1)
    maxParallelForks = 2
}

但是，我仍然不知道为什么这会影响单独运行和一起运行的测试。另外，自从我使用 Android Studio 1.2 以来，似乎不再需要 robolectric gradle 插件，但我无法弄清楚如何在没有它的情况下让它工作并手动设置 maxParallelForks 属性。