Android，Espresso：未找到带有“end by”标记的ImageView；"；

我想找到带有以文本“en”结尾的标记的imageView

我的浓缩咖啡测试：

    @Test
public void testViewPagerSwipe() {
    onView(withId(R.id.containerLanguageEN)).perform(click());
    onView(withId(R.id.textViewNext)).perform(click());
    ImageView imageViewTour = (ImageView) mActivityRule.getActivity().findViewById(R.id.imageViewTour);
    String tag = (String) imageViewTour.getTag();
    if (BuildConfig.DEBUG)
        Log.d(TAG, "testViewPagerSwipe: tag = " + tag);
    onView(allOf(withId(R.id.imageViewTour), withTagValue(is((Object) endsWith("en"))))).check(matches(isDisplayed()));
}

此测试打印：

testViewPagerSwipe: tag = walkthrough_01_en

正如您所看到的，imageViewTour的标记是“漫游”

但测试是失败的：

     android.support.test.espresso.NoMatchingViewException:

No views in hierarchy found matching: (with id: com.myproject.android.dev:id/imageViewTour and with tag value: is <a string ending with "en">)

android.support.test.espresso.nomatchingvieweexception:
在层次结构中找不到匹配的视图：（id:com.myproject.android.dev:id/imageViewTour，标记值：is）

为什么?