如何使用Espresso测试抽象类?

Question

假设我用Toolbar做一个抽象的BaseActivity，像这样:

/**
 * A base activity that handles common functionality in the app. 
 * This includes the Toolbar
 */
public abstract class BaseActivity extends AppCompatActivity {
    // Primary toolbar
    private Toolbar mToolbar;
    @Override
    public void setContentView(int layoutResId) {
        super.setContentView(layoutResId);
        setToolbar();
    }
    private void setToolbar() {
        if (mToolbar == null) {
            mToolbar = (Toolbar) findViewById(R.id.toolbar);
            if (mToolbar != null) {              
                mToolbar.setNavigationContentDescription(getResources().getString(
                    R.string.navigation_drawer_description_ally));
            setSupportActionBar(mToolbar);
            }
        }
    }
}

和扩展BaseActivity的MainActivity，如下所示:

public class MainActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

布局如下:

toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:elevation="@dimen/spacing_tiny"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    android:fitsSystemWindows="true"
    android:minHeight="?attr/actionBarSize"
    >
</android.support.v7.widget.Toolbar>

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity"
    >
    <include
        layout="@layout/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
</LinearLayout>

我的问题是:如何使用espresso测试BaseActivity ?例如，检查Toolbar是否存在?

Answer 1

你应该创建一个TestActivity来测试你的抽象BaseActivity类。但是请记住，该类应该只覆盖必要的方法和代码，以避免对BaseActivity类产生任何影响。

public class TestActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

然后你可以用你的Espresso

@RunWith(AndroidJUnit4.class)
@SmallTest
public class BaseActivityTest {
    @Rule
    public ActivityTestRule<TestActivity> mTestActivityActivityTestRule = new ActivityTestRule<TestActivity>(TestActivity.class, true, false);
    @Before
    public void set() {
        //setup your things
    }
    @Test
    public void testRequest1() {
        mTestActivityActivityTestRule.launchActivity(new Intent());
    }
}