使用 android espresso 访问自定义可扩展列表中的子项

Question

我正在尝试访问我的自定义可扩展列表中的孩子。该列表如下所示：

自定义可扩展列表

我可以通过以下方式成功访问组：

Espresso.onView(allOf(withId(R.id.groupRowTextView1), withText(startsWith("Candida")))).perform(click());

当我尝试访问子 EditText 时：

    Espresso.onData(is(instanceOf(CustomExpandableListAdapter.class)))
            .inAdapterView(withId(R.id.aversionsListView))
            .onChildView(allOf(withId(R.id.childEditText), isDisplayed()))
            .atPosition(1)
            .perform(click());

我收到此错误：

11-30 16:47:45.733    2479-2492/com.foodaversions.people I/TestRunner? ----- begin exception -----
11-30 16:47:45.733    2479-2492/com.foodaversions.people I/TestRunner? com.google.android.apps.common.testing.ui.espresso.PerformException: Error performing 'load adapter data' on view 'with id: is <2131099682>'.
        at com.google.android.apps.common.testing.ui.espresso.PerformException$Builder.build(PerformException.java:67)
        at com.google.android.apps.common.testing.ui.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:57)
        at com.google.android.apps.common.testing.ui.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:40)
        at com.google.android.apps.common.testing.ui.espresso.ViewInteraction.runSynchronouslyOnUiThread(ViewInteraction.java:159)
        at com.google.android.apps.common.testing.ui.espresso.ViewInteraction.doPerform(ViewInteraction.java:90)
        at com.google.android.apps.common.testing.ui.espresso.ViewInteraction.perform(ViewInteraction.java:73)
        at com.google.android.apps.common.testing.ui.espresso.DataInteraction.load(DataInteraction.java:135)
        at com.google.android.apps.common.testing.ui.espresso.DataInteraction.perform(DataInteraction.java:112)
        at com.foodaversions.people.ModifyAversionsTest.selectGlutenIntolerance(ModifyAversionsTest.java:49)
        at com.foodaversions.people.ModifyAversionsTest.test(ModifyAversionsTest.java:20)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
        at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
        at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
        at junit.framework.TestCase.runBare(TestCase.java:134)
        at junit.framework.TestResult$1.protect(TestResult.java:115)
        at junit.framework.TestResult.runProtected(TestResult.java:133)
        at junit.framework.TestResult.run(TestResult.java:118)
        at junit.framework.TestCase.run(TestCase.java:124)
        at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
        at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
        at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
        at com.google.android.apps.common.testing.testrunner.GoogleInstrumentationTestRunner.onStart(GoogleInstrumentationTestRunner.java:167)
        at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1584)
 Caused by: java.lang.RuntimeException: No data found matching: is an instance of com.foodaversions.people.adapters.CustomExpandableListAdapter contained values: <[Data: GroupStruct{id=6, name='Alcohol Intolerance', sourceTable=AVERSION_NAME, modifierEnum=EDITABLE, childData=
ChildStruct{id=-1, name='<Add Ingredient>', sourceTable=null, joinTable=null, modifierEnum=ADD_TEXT_VIEW}
}
(class: class com.foodaversions.people.data.ExpandableGroupData$GroupStruct) token: 0, Data: GroupStruct{id=8, name='Candida', sourceTable=AVERSION_NAME, modifierEnum=EDITABLE, childData=
ChildStruct{id=13, name='Sugar', sourceTable=AVERSION, joinTable=null, modifierEnum=DELETE}
ChildStruct{id=-1, name='<Add Ingredient>', sourceTable=null, joinTable=null, modifierEnum=ADD_TEXT_VIEW}
}
(class: class com.foodaversions.people.data.ExpandableGroupData$GroupStruct) token: 1, Data: ChildStruct{id=13, name='Sugar', sourceTable=AVERSION, joinTable=null, modifierEnum=DELETE} (class: class com.foodaversions.people.data.ChildStruct) token: 2, Data: ChildStruct{id=-1, name='<Add Ingredient>', sourceTable=null, joinTable=null, modifierEnum=ADD_TEXT_VIEW} (class: class com.foodaversions.people.data.ChildStruct) token: 3, Data: GroupStruct{id=3, name='Dairy Intolerance', sourceTable=AVERSION_NAME, modifierEnum=EDITABLE, childData=
ChildStruct{id=-1, name='<Add Ingredient>', sourceTable=null, joinTable=null, modifierEnum=ADD_TEXT_VIEW}
}
(class: class com.foodaversions.people.data.ExpandableGroupData$GroupStruct) token: 4, Data: GroupStruct{id=10, name='Egg Allergy', sourceTable=AVERSION_NAME, modifierEnum=EDITABLE, childData=
ChildStruct{id=-1, name='<Add Ingredient>', sourceTable=null, joinTable=null, modifierEnum
11-30 16:47:45.733    2479-2492/com.foodaversions.people I/TestRunner? ----- end exception -----

---

使用 onData 扩展组

我在让孩子点击工作时遇到了麻烦，我发现首先弄清楚如何扩展列表更容易：

    Espresso.onData(allOf(is(instanceOf(ExpandableGroupData.GroupStruct.class)), withGroupName("Candida")))
            .inAdapterView(withId(R.id.aversionsListView))
            .perform(click());

我认为这可能有助于解决单击子视图的问题。

---

解决方案

感谢@Anna 为我提供解决此问题所需的方向：

    // aversionsListView is the id of the ExpandableListView containing the expandable list
    Espresso.onData(allOf(is(instanceOf(ChildStruct.class)), withChildName("<Add Ingredient>")))
            .inAdapterView(withId(R.id.aversionsListView))
            .check(matches(isDisplayed()))
            .perform(click());

匹配器：

public static Matcher<Object> withChildName(String name) {
    checkNotNull(name);
    return withChildName(equalTo(name));
}

public static Matcher<Object> withChildName(final Matcher<String> name) {
    checkNotNull(name);
    // ChildStruct is the Class returned by BaseExpandableListAdapter.getChild()
    return new BoundedMatcher<Object, ChildStruct>(ChildStruct.class){

        @Override
        public boolean matchesSafely (final ChildStruct childStruct){
            return name.matches(childStruct.name);
        }

        @Override
        public void describeTo (Description description){
            name.describeTo(description);
        }
    } ;
}

Answer 1

使用适配器视图有几个要点。如果它正在从适配器加载数据，则无法使用简单视图，就好像 Espresso 不会等到数据加载一样。如果你要使用

Espresso.onData(is(instanceOf(CustomExpandableListAdapter.class))) .inAdapterView(withId(R.id.aversionsListView))

然后它就会返回AdapterListView。如果您想单击列表的第二项，则.atPosition(1)可以使用。如果R.id.childEditText是列表元素的类型，则必须将其与自定义匹配器进行匹配。你们不能.onChildView(allOf(withId(R.id.childEditText), isDisplayed())).atPosition(1)一起使用。

我建议编写一个自定义匹配器。请调查一下。自定义匹配器有助于获取列表项并在开始时进行匹配。您可以尝试编写这样的内容。

onData(allOf(is(instanceOf(<List item class for adapter>.class)), withListItemCheck(check_value))).check(matches(isDisplayed()));

你的匹配器可以是这样的：

  public static Matcher<Object> withListItemCheck(final <Type> check_value) {
    checkNotNull(check_value);
    return new BoundedMatcher<Object, <List_Item_class>>(<List_Item_class>.class) {
        private String m_message = "";

        @Override
        public void describeTo(Description d) {
            d.appendText(m_message);
        }

        @Override
        public boolean matchesSafely(<List_Item_class> listItem) {
            m_message = "Expected " + listItem+ " and got ";
            if (listItem== null) {
                m_message +=  "empty";
                return false;
            }
            return <assertion to check `check_value` is corresponding to `listItem` or not>;
        }
    };
}