TEST_Espresso

the difficulty tip is on recycleview ‘s content that not visible in firtpage,

which you can search for and find the views that match the non-unique R.id:

https://developer.android.com/training/testing/espresso/lists

官方test可以指定key 和value,是因为这个

@VisibleForTesting
protected static Map<String, Object> makeItem(int forRow) {
    Map<String, Object> dataRow = Maps.newHashMap();
    dataRow.put(ROW_TEXT, String.format(ITEM_TEXT_FORMAT, forRow));
    dataRow.put(ROW_ENABLED, forRow == 1);
    return dataRow;
}

但是我们的项目是没有的。

Adapter view warnings

NoMatchingViewException and AdapterView widgets are present in the view hierarchy, the most common solution is to use onData(). The exception message will include a warning with a list of the adapter views. You may use this information to invoke onData() to load the target view.

onData() used in AdapterView like recyclieview , not AdapterView use ondata() will have error

No views in hierarchy found matching: is assignable from class: class android.widget.AdapterView

Espresso warns users about presence of AdapterView widgets. When an onView() operation throws a exception

@Rule
@JvmField
val rule = ActivityTestRule(TestActivity::class.java)


@Test
fun useAppContext() {
    val appContext = InstrumentationRegistry.getInstrumentation().targetContext
    assertEquals("com.john.kot", appContext.packageName)
}


@Test
fun user_can_enter_first_name(){
    onView(withId(R.id.firstName)).perform(typeText("Daniel"))
}


@Test
fun user_can_enter_last_name(){
    onView(withId(R.id.lastName)).perform(typeText("Malone"))
}


@Test
fun when_user_enters_first_and_last_name_check_to_confirm_that_message_is_correct(){
    onView(withId(R.id.firstName)).perform(typeText("Jake"))
    onView(withId(R.id.lastName)).perform(typeText("Smith"))
    onView(withId(R.id.button)).perform(click())
    onView(withId(R.id.message)).check(matches(withText("Welcome,Jake Smith")))
}

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".test.InstrumentActivity">

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/et_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/dimen_10"
        android:hint="输入姓名"
        app:layout_constraintTop_toBottomOf="@+id/tv_name" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/dimen_10"
        android:onClick="sayClick"
        android:text="Say HELLO"
        app:layout_constraintTop_toBottomOf="@+id/et_name" />
</android.support.constraint.ConstraintLayout>

public void sayClick(View v) {
    TextView textView = findViewById(R.id.tv_name);
    EditText editText = findViewById(R.id.et_name);
    textView.setText("Say HELLO!" + editText.getText().toString() + "!");
}

@RunWith(AndroidJUnit4.class)
@LargeTest
public class InstrumentActivityTest {
    private static final String STRING_TO_BE_TYPED = "Jon";
    @Rule
    public ActivityTestRule<InstrumentActivity> instrumentActivityTestRule = new ActivityTestRule<>(InstrumentActivity.class);

    @Test
    public void sayHelloTest() {
        Espresso.onView(ViewMatchers.withId(R.id.et_name)).perform(ViewActions.typeText(STRING_TO_BE_TYPED), closeSoftKeyboard());
        Espresso.onView(ViewMatchers.withText("Say HELLO")).perform(click());


        String expectedText = "Say HELLO!" + STRING_TO_BE_TYPED + "!";
        Espresso.onView(ViewMatchers.withId(R.id.tv_name)).check(ViewAssertions.matches(ViewMatchers.withText(expectedText)));
    }
}