使用Espresso测试TextView值不为空，如果TextView值为空则测试失败

Question

我是Android测试新手。如果用户单击按钮并且TextView为空，我试图让测试失败。有没有办法在浓缩咖啡中执行此操作，因此如果TextView为空，它将失败。我不想检查TextView是否包含特定文本，我想检查它是否为空。

Answer 1

试试这个：

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;
import static org.hamcrest.Matchers.not;

@RunWith(AndroidJUnit4.class)
public class MainActivityInstrumentedTest {

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

    @Test
    public void checkTextView_isDisplayed_and_notEmpty() throws Exception {
        // perform a click on the button
        onView(withId(R.id.button)).perform(click());

        // passes if the textView does not match the empty string
        onView(withId(R.id.textView)).check(matches(not(withText(""))));
    }
}

只有在textView包含任何文本时才会通过测试。