java – Espresso：选择后为什么纺纱厂不关门？

我有一个关于在Spinners with Espresso中选择商品的问题.或者更确切地说：选择有效,但之后视图断言失败,因为微调器仍处于打开状态.

假设我有一个非常简单的活动,其中包含一个微调器和一个显示选择的textview,如下所示：

现在,我写了一个Espresso测试,选择’狗’并验证textview是否相应更新：

@Test
public void selectDogs() throws Exception {
    onData(allOf(is(instanceOf(String.class)), is("dogs")))
            .inAdapterView(withId(R.id.spinner))
            .perform(click());
    onView(withId(R.id.selected)).check(matches(withText("dogs")));
}

该测试失败,因为onData()…执行(click());没有关闭旋转器,它只是让它打开.通过调试验证：

例外是：

android.support.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with id: org.flinc.app:id/selected
If the target view is not part of the view hierarchy, you may need to use Espresso.onData to load it from one of the following AdapterViews:android.widget.ListPopupWindow$DropDownListView{226cb88 VFED.VC.. .F...... 0,0-231,432}

我可以(通过在微调器选择后添加pressBack()来修复我的测试,但对我来说这不是正确的解决方案.它也会在模拟器上出现问题,但它似乎在我的设备上正常运行.
如何在微调器中正确选择然后关闭它？

非常感谢您的帮助！

以下是活动代码供参考：

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test_spinner);

    Spinner spinner = (Spinner) findViewById(R.id.spinner);
    final TextView selected = (TextView) findViewById(R.id.selected);

    final List<String> items = Arrays.asList("cats", "dogs", "unicorns");
    final ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, items);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            selected.setText(items.get(position));
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            selected.setText("");
        }

    });
}

解决方法:

您必须先单击微调器,使用以下代码：

@Test
public void selectDogs() throws Exception {
    onView(withId(R.id.spinner)).perform(click());
    onData(allOf(is(instanceOf(String.class)), is("dogs")))
            .perform(click());
    onView(withId(R.id.selected)).check(matches(withText("dogs")));
}

标签：ui-testing,android,java,android-espresso,android-spinner
来源： https://codeday.me/bug/20191009/1877259.html