// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package io.flutter.view;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.any;
import static org.mockito.Mockito.anyInt;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.reset;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.graphics.Rect;
import android.os.Bundle;
import android.text.SpannedString;
import android.text.style.LocaleSpan;
import android.text.style.TtsSpan;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewParent;
import android.view.Window;
import android.view.WindowInsets;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityNodeInfo;
import io.flutter.embedding.engine.systemchannels.AccessibilityChannel;
import io.flutter.plugin.platform.PlatformViewsAccessibilityDelegate;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.RuntimeEnvironment;
import org.robolectric.annotation.Config;

@Config(manifest = Config.NONE)
@RunWith(RobolectricTestRunner.class)
@TargetApi(19)
public class AccessibilityBridgeTest {

  @Test
  public void itDescribesNonTextFieldsWithAContentDescription() {
    AccessibilityBridge accessibilityBridge = setUpBridge();

    TestSemanticsNode testSemanticsNode = new TestSemanticsNode();
    testSemanticsNode.label = "Hello, World";
    TestSemanticsUpdate testSemanticsUpdate = testSemanticsNode.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(0);

    assertEquals(nodeInfo.getContentDescription().toString(), "Hello, World");
    assertEquals(nodeInfo.getText(), null);
  }

  @Test
  public void itDescribesTextFieldsWithText() {
    AccessibilityBridge accessibilityBridge = setUpBridge();

    TestSemanticsNode testSemanticsNode = new TestSemanticsNode();
    testSemanticsNode.label = "Hello, World";
    testSemanticsNode.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    TestSemanticsUpdate testSemanticsUpdate = testSemanticsNode.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(0);

    assertEquals(nodeInfo.getContentDescription(), null);
    assertEquals(nodeInfo.getText().toString(), "Hello, World");
  }

  @Test
  public void itTakesGlobalCoordinatesOfFlutterViewIntoAccount() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    final int position = 88;
    // The getBoundsInScreen() in createAccessibilityNodeInfo() needs View.getLocationOnScreen()
    doAnswer(
            invocation -> {
              int[] outLocation = (int[]) invocation.getArguments()[0];
              outLocation[0] = position;
              outLocation[1] = position;
              return null;
            })
        .when(mockRootView)
        .getLocationOnScreen(any(int[].class));

    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);

    TestSemanticsNode testSemanticsNode = new TestSemanticsNode();
    TestSemanticsUpdate testSemanticsUpdate = testSemanticsNode.toUpdate();

    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(0);

    Rect outBoundsInScreen = new Rect();
    nodeInfo.getBoundsInScreen(outBoundsInScreen);
    assertEquals(position, outBoundsInScreen.left);
    assertEquals(position, outBoundsInScreen.top);
  }

  @Test
  public void itDoesNotContainADescriptionIfScopesRoute() {
    AccessibilityBridge accessibilityBridge = setUpBridge();

    TestSemanticsNode testSemanticsNode = new TestSemanticsNode();
    testSemanticsNode.label = "Hello, World";
    testSemanticsNode.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    TestSemanticsUpdate testSemanticsUpdate = testSemanticsNode.toUpdate();

    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(0);

    assertEquals(nodeInfo.getContentDescription(), null);
    assertEquals(nodeInfo.getText(), null);
  }

  @Test
  public void itUnfocusesPlatformViewWhenPlatformViewGoesAway() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);

    // Sent a11y tree with platform view.
    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode platformView = new TestSemanticsNode();
    platformView.id = 1;
    platformView.platformViewId = 42;
    root.children.add(platformView);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    // Set a11y focus to platform view.
    View mockView = mock(View.class);
    AccessibilityEvent focusEvent = mock(AccessibilityEvent.class);
    when(mockViewEmbedder.requestSendAccessibilityEvent(mockView, mockView, focusEvent))
        .thenReturn(true);
    when(mockViewEmbedder.getRecordFlutterId(mockView, focusEvent)).thenReturn(42);
    when(focusEvent.getEventType()).thenReturn(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
    accessibilityBridge.externalViewRequestSendAccessibilityEvent(mockView, mockView, focusEvent);

    // Replace the platform view.
    TestSemanticsNode node = new TestSemanticsNode();
    node.id = 2;
    root.children.clear();
    root.children.add(node);
    testSemanticsUpdate = root.toUpdate();
    when(mockManager.isEnabled()).thenReturn(true);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    // Check that unfocus event was sent.
    ArgumentCaptor<AccessibilityEvent> eventCaptor =
        ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(2))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    AccessibilityEvent event = eventCaptor.getAllValues().get(0);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
  }

  @Test
  public void itAnnouncesRouteNameWhenAddingNewRoute() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    node1.addFlag(AccessibilityBridge.Flag.NAMES_ROUTE);
    node1.label = "node1";
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    ArgumentCaptor<AccessibilityEvent> eventCaptor =
        ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(2))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    AccessibilityEvent event = eventCaptor.getAllValues().get(0);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    List<CharSequence> sentences = event.getText();
    assertEquals(sentences.size(), 1);
    assertEquals(sentences.get(0).toString(), "node1");

    TestSemanticsNode new_root = new TestSemanticsNode();
    new_root.id = 0;
    TestSemanticsNode new_node1 = new TestSemanticsNode();
    new_node1.id = 1;
    new_node1.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    new_node1.addFlag(AccessibilityBridge.Flag.NAMES_ROUTE);
    new_node1.label = "new_node1";
    new_root.children.add(new_node1);
    TestSemanticsNode new_node2 = new TestSemanticsNode();
    new_node2.id = 2;
    new_node2.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    new_node2.addFlag(AccessibilityBridge.Flag.NAMES_ROUTE);
    new_node2.label = "new_node2";
    new_node1.children.add(new_node2);
    testSemanticsUpdate = new_root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    eventCaptor = ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(4))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    event = eventCaptor.getAllValues().get(2);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    sentences = event.getText();
    assertEquals(sentences.size(), 1);
    assertEquals(sentences.get(0).toString(), "new_node2");
  }

  @Test
  public void itSetsTraversalAfter() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.label = "node1";
    root.children.add(node1);
    TestSemanticsNode node2 = new TestSemanticsNode();
    node2.id = 2;
    node2.label = "node2";
    root.children.add(node2);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    AccessibilityBridge spyAccessibilityBridge = spy(accessibilityBridge);
    AccessibilityNodeInfo mockNodeInfo2 = mock(AccessibilityNodeInfo.class);

    when(spyAccessibilityBridge.obtainAccessibilityNodeInfo(mockRootView, 2))
        .thenReturn(mockNodeInfo2);
    spyAccessibilityBridge.createAccessibilityNodeInfo(2);
    verify(mockNodeInfo2, times(1)).setTraversalAfter(eq(mockRootView), eq(1));
  }

  @TargetApi(28)
  @Test
  public void itSetCutoutInsetBasedonLayoutModeNever() {
    int expectedInsetLeft = 5;
    int top = 0;
    int left = 0;
    int right = 100;
    int bottom = 200;
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Activity context = mock(Activity.class);
    Window window = mock(Window.class);
    WindowInsets insets = mock(WindowInsets.class);
    WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
    layoutParams.layoutInDisplayCutoutMode =
        WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_NEVER;
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getWindow()).thenReturn(window);
    when(window.getAttributes()).thenReturn(layoutParams);
    when(mockRootView.getRootWindowInsets()).thenReturn(insets);
    when(insets.getSystemWindowInsetLeft()).thenReturn(expectedInsetLeft);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    root.left = left;
    root.top = top;
    root.right = right;
    root.bottom = bottom;
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    AccessibilityBridge spyAccessibilityBridge = spy(accessibilityBridge);
    AccessibilityNodeInfo mockNodeInfo = mock(AccessibilityNodeInfo.class);

    when(spyAccessibilityBridge.obtainAccessibilityNodeInfo(mockRootView, 0))
        .thenReturn(mockNodeInfo);
    spyAccessibilityBridge.createAccessibilityNodeInfo(0);
    verify(mockNodeInfo, times(1))
        .setBoundsInScreen(
            new Rect(left + expectedInsetLeft, top, right + expectedInsetLeft, bottom));
  }

  @TargetApi(28)
  @Test
  public void itSetCutoutInsetBasedonLayoutModeDefault() {
    int expectedInsetLeft = 5;
    int top = 0;
    int left = 0;
    int right = 100;
    int bottom = 200;
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Activity context = mock(Activity.class);
    Window window = mock(Window.class);
    WindowInsets insets = mock(WindowInsets.class);
    WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
    layoutParams.layoutInDisplayCutoutMode =
        WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT;
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getWindow()).thenReturn(window);
    when(window.getAttributes()).thenReturn(layoutParams);
    when(mockRootView.getRootWindowInsets()).thenReturn(insets);
    when(insets.getSystemWindowInsetLeft()).thenReturn(expectedInsetLeft);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    root.left = left;
    root.top = top;
    root.right = right;
    root.bottom = bottom;
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    AccessibilityBridge spyAccessibilityBridge = spy(accessibilityBridge);
    AccessibilityNodeInfo mockNodeInfo = mock(AccessibilityNodeInfo.class);

    when(spyAccessibilityBridge.obtainAccessibilityNodeInfo(mockRootView, 0))
        .thenReturn(mockNodeInfo);
    spyAccessibilityBridge.createAccessibilityNodeInfo(0);
    verify(mockNodeInfo, times(1))
        .setBoundsInScreen(
            new Rect(left + expectedInsetLeft, top, right + expectedInsetLeft, bottom));
  }

  @TargetApi(28)
  @Test
  public void itSetCutoutInsetBasedonLayoutModeShortEdges() {
    int expectedInsetLeft = 5;
    int top = 0;
    int left = 0;
    int right = 100;
    int bottom = 200;
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Activity context = mock(Activity.class);
    Window window = mock(Window.class);
    WindowInsets insets = mock(WindowInsets.class);
    WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
    layoutParams.layoutInDisplayCutoutMode =
        WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getWindow()).thenReturn(window);
    when(window.getAttributes()).thenReturn(layoutParams);
    when(mockRootView.getRootWindowInsets()).thenReturn(insets);
    when(insets.getSystemWindowInsetLeft()).thenReturn(expectedInsetLeft);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    root.left = left;
    root.top = top;
    root.right = right;
    root.bottom = bottom;
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    AccessibilityBridge spyAccessibilityBridge = spy(accessibilityBridge);
    AccessibilityNodeInfo mockNodeInfo = mock(AccessibilityNodeInfo.class);

    when(spyAccessibilityBridge.obtainAccessibilityNodeInfo(mockRootView, 0))
        .thenReturn(mockNodeInfo);
    spyAccessibilityBridge.createAccessibilityNodeInfo(0);
    // Does not apply left inset if the layout mode is `short edges`.
    verify(mockNodeInfo, times(1)).setBoundsInScreen(new Rect(left, top, right, bottom));
  }

  @TargetApi(30)
  @Test
  public void itSetCutoutInsetBasedonLayoutModeAlways() {
    int expectedInsetLeft = 5;
    int top = 0;
    int left = 0;
    int right = 100;
    int bottom = 200;
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Activity context = mock(Activity.class);
    Window window = mock(Window.class);
    WindowInsets insets = mock(WindowInsets.class);
    WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
    layoutParams.layoutInDisplayCutoutMode =
        WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getWindow()).thenReturn(window);
    when(window.getAttributes()).thenReturn(layoutParams);
    when(mockRootView.getRootWindowInsets()).thenReturn(insets);
    when(insets.getSystemWindowInsetLeft()).thenReturn(expectedInsetLeft);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    root.left = left;
    root.top = top;
    root.right = right;
    root.bottom = bottom;
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    AccessibilityBridge spyAccessibilityBridge = spy(accessibilityBridge);
    AccessibilityNodeInfo mockNodeInfo = mock(AccessibilityNodeInfo.class);

    when(spyAccessibilityBridge.obtainAccessibilityNodeInfo(mockRootView, 0))
        .thenReturn(mockNodeInfo);
    spyAccessibilityBridge.createAccessibilityNodeInfo(0);
    // Does not apply left inset if the layout mode is `always`.
    verify(mockNodeInfo, times(1)).setBoundsInScreen(new Rect(left, top, right, bottom));
  }

  @Test
  public void itIgnoresUnfocusableNodeDuringHitTest() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);
    when(mockManager.isTouchExplorationEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    root.left = 0;
    root.top = 0;
    root.bottom = 20;
    root.right = 20;
    TestSemanticsNode ignored = new TestSemanticsNode();
    ignored.id = 1;
    ignored.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    ignored.left = 0;
    ignored.top = 0;
    ignored.bottom = 20;
    ignored.right = 20;
    root.children.add(ignored);
    TestSemanticsNode child = new TestSemanticsNode();
    child.id = 2;
    child.label = "label";
    child.left = 0;
    child.top = 0;
    child.bottom = 20;
    child.right = 20;
    root.children.add(child);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    ArgumentCaptor<AccessibilityEvent> eventCaptor =
        ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(2))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    AccessibilityEvent event = eventCaptor.getAllValues().get(0);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);

    // Synthesize an accessibility hit test event.
    MotionEvent mockEvent = mock(MotionEvent.class);
    when(mockEvent.getX()).thenReturn(10.0f);
    when(mockEvent.getY()).thenReturn(10.0f);
    when(mockEvent.getAction()).thenReturn(MotionEvent.ACTION_HOVER_ENTER);
    boolean hit = accessibilityBridge.onAccessibilityHoverEvent(mockEvent);

    assertEquals(hit, true);

    eventCaptor = ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(3))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    event = eventCaptor.getAllValues().get(2);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
    assertEquals(accessibilityBridge.getHoveredObjectId(), 2);
  }

  @Test
  public void itAnnouncesRouteNameWhenRemoveARoute() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    node1.addFlag(AccessibilityBridge.Flag.NAMES_ROUTE);
    node1.label = "node1";
    root.children.add(node1);
    TestSemanticsNode node2 = new TestSemanticsNode();
    node2.id = 2;
    node2.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    node2.addFlag(AccessibilityBridge.Flag.NAMES_ROUTE);
    node2.label = "node2";
    node1.children.add(node2);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    ArgumentCaptor<AccessibilityEvent> eventCaptor =
        ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(2))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    AccessibilityEvent event = eventCaptor.getAllValues().get(0);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    List<CharSequence> sentences = event.getText();
    assertEquals(sentences.size(), 1);
    assertEquals(sentences.get(0).toString(), "node2");

    TestSemanticsNode new_root = new TestSemanticsNode();
    new_root.id = 0;
    TestSemanticsNode new_node1 = new TestSemanticsNode();
    new_node1.id = 1;
    new_node1.label = "new_node1";
    new_root.children.add(new_node1);
    TestSemanticsNode new_node2 = new TestSemanticsNode();
    new_node2.id = 2;
    new_node2.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    new_node2.addFlag(AccessibilityBridge.Flag.NAMES_ROUTE);
    new_node2.label = "new_node2";
    new_node1.children.add(new_node2);
    testSemanticsUpdate = new_root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    eventCaptor = ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(4))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    event = eventCaptor.getAllValues().get(2);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    sentences = event.getText();
    assertEquals(sentences.size(), 1);
    assertEquals(sentences.get(0).toString(), "new_node2");
  }

  @TargetApi(21)
  @Test
  public void itCanPerformSetText() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    String expectedText = "some string";
    bundle.putString(AccessibilityNodeInfo.ACTION_ARGUMENT_SET_TEXT_CHARSEQUENCE, expectedText);
    accessibilityBridge.performAction(1, AccessibilityNodeInfo.ACTION_SET_TEXT, bundle);
    verify(mockChannel)
        .dispatchSemanticsAction(1, AccessibilityBridge.Action.SET_TEXT, expectedText);
  }

  @TargetApi(21)
  @Test
  public void itCanPredictSetText() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    String expectedText = "some string";
    bundle.putString(AccessibilityNodeInfo.ACTION_ARGUMENT_SET_TEXT_CHARSEQUENCE, expectedText);
    accessibilityBridge.performAction(1, AccessibilityNodeInfo.ACTION_SET_TEXT, bundle);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    assertEquals(nodeInfo.getText().toString(), expectedText);
  }

  @TargetApi(21)
  @Test
  public void itBuildsAttributedString() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    root.label = "label";
    TestStringAttribute attribute = new TestStringAttributeSpellOut();
    attribute.start = 1;
    attribute.end = 2;
    attribute.type = TestStringAttributeType.SPELLOUT;
    root.labelAttributes =
        new ArrayList<TestStringAttribute>() {
          {
            add(attribute);
          }
        };
    root.value = "value";
    TestStringAttributeLocale localeAttribute = new TestStringAttributeLocale();
    localeAttribute.start = 1;
    localeAttribute.end = 2;
    localeAttribute.type = TestStringAttributeType.LOCALE;
    localeAttribute.locale = "es-MX";
    root.valueAttributes =
        new ArrayList<TestStringAttribute>() {
          {
            add(localeAttribute);
          }
        };

    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(0);
    SpannedString actual = (SpannedString) nodeInfo.getContentDescription();
    assertEquals(actual.toString(), "value, label");
    Object[] objectSpans = actual.getSpans(0, actual.length(), Object.class);
    assertEquals(objectSpans.length, 2);
    LocaleSpan localeSpan = (LocaleSpan) objectSpans[0];
    assertEquals(localeSpan.getLocale().toLanguageTag(), "es-MX");
    assertEquals(actual.getSpanStart(localeSpan), 1);
    assertEquals(actual.getSpanEnd(localeSpan), 2);
    TtsSpan spellOutSpan = (TtsSpan) objectSpans[1];
    assertEquals(spellOutSpan.getType(), TtsSpan.TYPE_VERBATIM);
    assertEquals(actual.getSpanStart(spellOutSpan), 8);
    assertEquals(actual.getSpanEnd(spellOutSpan), 9);
  }

  @TargetApi(21)
  @Test
  public void itCanCreateAccessibilityNodeInfoWithSetText() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    node1.addAction(AccessibilityBridge.Action.SET_TEXT);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    List<AccessibilityNodeInfo.AccessibilityAction> actions = nodeInfo.getActionList();
    assertTrue(actions.contains(AccessibilityNodeInfo.AccessibilityAction.ACTION_SET_TEXT));
  }

  @Test
  public void itCanPredictSetSelection() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.value = "some text";
    node1.textSelectionBase = -1;
    node1.textSelectionExtent = -1;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    int expectedStart = 1;
    int expectedEnd = 3;
    bundle.putInt(AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, expectedStart);
    bundle.putInt(AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, expectedEnd);
    accessibilityBridge.performAction(1, AccessibilityNodeInfo.ACTION_SET_SELECTION, bundle);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    assertEquals(nodeInfo.getTextSelectionStart(), expectedStart);
    assertEquals(nodeInfo.getTextSelectionEnd(), expectedEnd);
  }

  @Test
  public void itCanPredictCursorMovementsWithGranularityWord() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.value = "some text";
    node1.textSelectionBase = 0;
    node1.textSelectionExtent = 0;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, bundle);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    // The seletction should be at the end of 'text'
    assertEquals(nodeInfo.getTextSelectionStart(), 9);
    assertEquals(nodeInfo.getTextSelectionEnd(), 9);

    bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, bundle);
    nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    // The seletction should be go to beginning of 'text'.
    assertEquals(nodeInfo.getTextSelectionStart(), 5);
    assertEquals(nodeInfo.getTextSelectionEnd(), 5);
  }

  @Test
  public void itCanPredictCursorMovementsWithGranularityWordUnicode() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.value = "你 好 嗎";
    node1.textSelectionBase = 0;
    node1.textSelectionExtent = 0;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, bundle);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    // The seletction should be at the end of '好'
    assertEquals(nodeInfo.getTextSelectionStart(), 3);
    assertEquals(nodeInfo.getTextSelectionEnd(), 3);

    bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, bundle);
    nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    // The seletction should be go to beginning of '好'.
    assertEquals(nodeInfo.getTextSelectionStart(), 2);
    assertEquals(nodeInfo.getTextSelectionEnd(), 2);
  }

  @Test
  public void itCanPredictCursorMovementsWithGranularityLine() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.value = "How are you\nI am fine\nThank you";
    // Selection is at the second line.
    node1.textSelectionBase = 14;
    node1.textSelectionExtent = 14;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_LINE);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, bundle);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    // The seletction should be at the beginning of the third line.
    assertEquals(nodeInfo.getTextSelectionStart(), 21);
    assertEquals(nodeInfo.getTextSelectionEnd(), 21);

    bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_LINE);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, bundle);
    nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    // The seletction should be at the beginning of the second line.
    assertEquals(nodeInfo.getTextSelectionStart(), 11);
    assertEquals(nodeInfo.getTextSelectionEnd(), 11);
  }

  @Test
  public void itCanPredictCursorMovementsWithGranularityCharacter() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ mockRootView,
            /*accessibilityChannel=*/ mockChannel,
            /*accessibilityManager=*/ mockManager,
            /*contentResolver=*/ null,
            /*accessibilityViewEmbedder=*/ mockViewEmbedder,
            /*platformViewsAccessibilityDelegate=*/ null);

    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode node1 = new TestSemanticsNode();
    node1.id = 1;
    node1.value = "some text";
    node1.textSelectionBase = 0;
    node1.textSelectionExtent = 0;
    node1.addFlag(AccessibilityBridge.Flag.IS_TEXT_FIELD);
    root.children.add(node1);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);
    Bundle bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, bundle);
    AccessibilityNodeInfo nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    assertEquals(nodeInfo.getTextSelectionStart(), 1);
    assertEquals(nodeInfo.getTextSelectionEnd(), 1);

    bundle = new Bundle();
    bundle.putInt(
        AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT,
        AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER);
    bundle.putBoolean(AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN, false);
    accessibilityBridge.performAction(
        1, AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, bundle);
    nodeInfo = accessibilityBridge.createAccessibilityNodeInfo(1);
    assertEquals(nodeInfo.getTextSelectionStart(), 0);
    assertEquals(nodeInfo.getTextSelectionEnd(), 0);
  }

  @Test
  public void itAnnouncesWhiteSpaceWhenNoNamesRoute() {
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);
    ViewParent mockParent = mock(ViewParent.class);
    when(mockRootView.getParent()).thenReturn(mockParent);
    when(mockManager.isEnabled()).thenReturn(true);

    // Sent a11y tree with scopeRoute without namesRoute.
    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode scopeRoute = new TestSemanticsNode();
    scopeRoute.id = 1;
    scopeRoute.addFlag(AccessibilityBridge.Flag.SCOPES_ROUTE);
    root.children.add(scopeRoute);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    ArgumentCaptor<AccessibilityEvent> eventCaptor =
        ArgumentCaptor.forClass(AccessibilityEvent.class);
    verify(mockParent, times(2))
        .requestSendAccessibilityEvent(eq(mockRootView), eventCaptor.capture());
    AccessibilityEvent event = eventCaptor.getAllValues().get(0);
    assertEquals(event.getEventType(), AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    List<CharSequence> sentences = event.getText();
    assertEquals(sentences.size(), 1);
    assertEquals(sentences.get(0).toString(), " ");
  }

  @Test
  public void itHoverOverOutOfBoundsDoesNotCrash() {
    // SementicsNode.hitTest() returns null when out of bounds.
    AccessibilityViewEmbedder mockViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    View mockRootView = mock(View.class);
    Context context = mock(Context.class);
    when(mockRootView.getContext()).thenReturn(context);
    when(context.getPackageName()).thenReturn("test");
    AccessibilityBridge accessibilityBridge =
        setUpBridge(mockRootView, mockManager, mockViewEmbedder);

    // Sent a11y tree with platform view.
    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;
    TestSemanticsNode platformView = new TestSemanticsNode();
    platformView.id = 1;
    platformView.platformViewId = 42;
    root.children.add(platformView);
    TestSemanticsUpdate testSemanticsUpdate = root.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    // Pass an out of bounds MotionEvent.
    accessibilityBridge.onAccessibilityHoverEvent(MotionEvent.obtain(1, 1, 1, -10, -10, 0));
  }

  @Test
  public void itProducesPlatformViewNodeForHybridComposition() {
    PlatformViewsAccessibilityDelegate accessibilityDelegate =
        mock(PlatformViewsAccessibilityDelegate.class);

    Context context = RuntimeEnvironment.application.getApplicationContext();
    View rootAccessibilityView = new View(context);
    AccessibilityViewEmbedder accessibilityViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            rootAccessibilityView,
            /*accessibilityChannel=*/ null,
            /*accessibilityManager=*/ null,
            /*contentResolver=*/ null,
            accessibilityViewEmbedder,
            accessibilityDelegate);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;

    TestSemanticsNode platformView = new TestSemanticsNode();
    platformView.id = 1;
    platformView.platformViewId = 1;
    root.addChild(platformView);

    TestSemanticsUpdate testSemanticsRootUpdate = root.toUpdate();
    testSemanticsRootUpdate.sendUpdateToBridge(accessibilityBridge);

    TestSemanticsUpdate testSemanticsPlatformViewUpdate = platformView.toUpdate();
    testSemanticsPlatformViewUpdate.sendUpdateToBridge(accessibilityBridge);

    View embeddedView = mock(View.class);
    when(accessibilityDelegate.getPlatformViewById(1)).thenReturn(embeddedView);
    when(accessibilityDelegate.usesVirtualDisplay(1)).thenReturn(false);

    AccessibilityNodeInfo nodeInfo = mock(AccessibilityNodeInfo.class);
    when(embeddedView.createAccessibilityNodeInfo()).thenReturn(nodeInfo);

    AccessibilityNodeInfo result = accessibilityBridge.createAccessibilityNodeInfo(0);
    assertNotNull(result);
    assertEquals(result.getChildCount(), 1);
    assertEquals(result.getClassName(), "android.view.View");
  }

  @Test
  public void itMakesPlatformViewImportantForAccessibility() {
    PlatformViewsAccessibilityDelegate accessibilityDelegate =
        mock(PlatformViewsAccessibilityDelegate.class);

    Context context = RuntimeEnvironment.application.getApplicationContext();
    View rootAccessibilityView = new View(context);
    AccessibilityViewEmbedder accessibilityViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            rootAccessibilityView,
            /*accessibilityChannel=*/ null,
            /*accessibilityManager=*/ null,
            /*contentResolver=*/ null,
            accessibilityViewEmbedder,
            accessibilityDelegate);

    TestSemanticsNode root = new TestSemanticsNode();
    root.id = 0;

    TestSemanticsNode platformView = new TestSemanticsNode();
    platformView.id = 1;
    platformView.platformViewId = 1;
    root.addChild(platformView);

    View embeddedView = mock(View.class);
    when(accessibilityDelegate.getPlatformViewById(1)).thenReturn(embeddedView);
    when(accessibilityDelegate.usesVirtualDisplay(1)).thenReturn(false);

    TestSemanticsUpdate testSemanticsRootUpdate = root.toUpdate();
    testSemanticsRootUpdate.sendUpdateToBridge(accessibilityBridge);

    verify(embeddedView).setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_AUTO);
  }

  @Test
  public void itMakesPlatformViewNoImportantForAccessibility() {
    PlatformViewsAccessibilityDelegate accessibilityDelegate =
        mock(PlatformViewsAccessibilityDelegate.class);

    Context context = RuntimeEnvironment.application.getApplicationContext();
    View rootAccessibilityView = new View(context);
    AccessibilityViewEmbedder accessibilityViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            rootAccessibilityView,
            /*accessibilityChannel=*/ null,
            /*accessibilityManager=*/ null,
            /*contentResolver=*/ null,
            accessibilityViewEmbedder,
            accessibilityDelegate);

    TestSemanticsNode rootWithPlatformView = new TestSemanticsNode();
    rootWithPlatformView.id = 0;

    TestSemanticsNode platformView = new TestSemanticsNode();
    platformView.id = 1;
    platformView.platformViewId = 1;
    rootWithPlatformView.addChild(platformView);

    View embeddedView = mock(View.class);
    when(accessibilityDelegate.getPlatformViewById(1)).thenReturn(embeddedView);
    when(accessibilityDelegate.usesVirtualDisplay(1)).thenReturn(false);

    TestSemanticsUpdate testSemanticsRootWithPlatformViewUpdate = rootWithPlatformView.toUpdate();
    testSemanticsRootWithPlatformViewUpdate.sendUpdateToBridge(accessibilityBridge);

    TestSemanticsNode rootWithoutPlatformView = new TestSemanticsNode();
    rootWithoutPlatformView.id = 0;
    TestSemanticsUpdate testSemanticsRootWithoutPlatformViewUpdate =
        rootWithoutPlatformView.toUpdate();
    testSemanticsRootWithoutPlatformViewUpdate.sendUpdateToBridge(accessibilityBridge);

    verify(embeddedView)
        .setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
  }

  @Test
  public void itProducesPlatformViewNodeForVirtualDisplay() {
    PlatformViewsAccessibilityDelegate accessibilityDelegate =
        mock(PlatformViewsAccessibilityDelegate.class);
    AccessibilityViewEmbedder accessibilityViewEmbedder = mock(AccessibilityViewEmbedder.class);
    AccessibilityBridge accessibilityBridge =
        setUpBridge(
            /*rootAccessibilityView=*/ null,
            /*accessibilityChannel=*/ null,
            /*accessibilityManager=*/ null,
            /*contentResolver=*/ null,
            accessibilityViewEmbedder,
            accessibilityDelegate);

    TestSemanticsNode platformView = new TestSemanticsNode();
    platformView.platformViewId = 1;

    TestSemanticsUpdate testSemanticsUpdate = platformView.toUpdate();
    testSemanticsUpdate.sendUpdateToBridge(accessibilityBridge);

    View embeddedView = mock(View.class);
    when(accessibilityDelegate.getPlatformViewById(1)).thenReturn(embeddedView);
    when(accessibilityDelegate.usesVirtualDisplay(1)).thenReturn(true);

    accessibilityBridge.createAccessibilityNodeInfo(0);
    verify(accessibilityViewEmbedder).getRootNode(eq(embeddedView), eq(0), any(Rect.class));
  }

  @Test
  public void releaseDropsChannelMessageHandler() {
    AccessibilityChannel mockChannel = mock(AccessibilityChannel.class);
    AccessibilityManager mockManager = mock(AccessibilityManager.class);
    ContentResolver mockContentResolver = mock(ContentResolver.class);
    when(mockManager.isEnabled()).thenReturn(true);
    AccessibilityBridge accessibilityBridge =
        setUpBridge(null, mockChannel, mockManager, mockContentResolver, null, null);
    verify(mockChannel)
        .setAccessibilityMessageHandler(
            any(AccessibilityChannel.AccessibilityMessageHandler.class));
    ArgumentCaptor<AccessibilityManager.AccessibilityStateChangeListener> stateListenerCaptor =
        ArgumentCaptor.forClass(AccessibilityManager.AccessibilityStateChangeListener.class);
    ArgumentCaptor<AccessibilityManager.TouchExplorationStateChangeListener> touchListenerCaptor =
        ArgumentCaptor.forClass(AccessibilityManager.TouchExplorationStateChangeListener.class);
    verify(mockManager).addAccessibilityStateChangeListener(stateListenerCaptor.capture());
    verify(mockManager).addTouchExplorationStateChangeListener(touchListenerCaptor.capture());
    accessibilityBridge.release();
    verify(mockChannel).setAccessibilityMessageHandler(null);
    reset(mockChannel);
    stateListenerCaptor.getValue().onAccessibilityStateChanged(true);
    verify(mockChannel, never()).onAndroidAccessibilityEnabled();
    touchListenerCaptor.getValue().onTouchExplorationStateChanged(true);
    verify(mockChannel, never()).setAccessibilityFeatures(anyInt());
  }

  AccessibilityBridge setUpBridge() {
    return setUpBridge(null, null, null, null, null, null);
  }

  AccessibilityBridge setUpBridge(
      View rootAccessibilityView,
      AccessibilityManager accessibilityManager,
      AccessibilityViewEmbedder accessibilityViewEmbedder) {
    return setUpBridge(
        rootAccessibilityView, null, accessibilityManager, null, accessibilityViewEmbedder, null);
  }

  AccessibilityBridge setUpBridge(
      View rootAccessibilityView,
      AccessibilityChannel accessibilityChannel,
      AccessibilityManager accessibilityManager,
      ContentResolver contentResolver,
      AccessibilityViewEmbedder accessibilityViewEmbedder,
      PlatformViewsAccessibilityDelegate platformViewsAccessibilityDelegate) {
    if (rootAccessibilityView == null) {
      rootAccessibilityView = mock(View.class);
      Context context = mock(Context.class);
      when(rootAccessibilityView.getContext()).thenReturn(context);
      when(context.getPackageName()).thenReturn("test");
    }
    if (accessibilityChannel == null) {
      accessibilityChannel = mock(AccessibilityChannel.class);
    }
    if (accessibilityManager == null) {
      accessibilityManager = mock(AccessibilityManager.class);
    }
    if (contentResolver == null) {
      contentResolver = mock(ContentResolver.class);
    }
    if (accessibilityViewEmbedder == null) {
      accessibilityViewEmbedder = mock(AccessibilityViewEmbedder.class);
    }
    if (platformViewsAccessibilityDelegate == null) {
      platformViewsAccessibilityDelegate = mock(PlatformViewsAccessibilityDelegate.class);
    }
    return new AccessibilityBridge(
        rootAccessibilityView,
        accessibilityChannel,
        accessibilityManager,
        contentResolver,
        accessibilityViewEmbedder,
        platformViewsAccessibilityDelegate);
  }

  /// The encoding for semantics is described in platform_view_android.cc
  class TestSemanticsUpdate {
    TestSemanticsUpdate(ByteBuffer buffer, String[] strings, ByteBuffer[] stringAttributeArgs) {
      this.buffer = buffer;
      this.strings = strings;
      this.stringAttributeArgs = stringAttributeArgs;
    }

    void sendUpdateToBridge(AccessibilityBridge bridge) {
      bridge.updateSemantics(buffer, strings, stringAttributeArgs);
    }

    final ByteBuffer buffer;
    final String[] strings;
    final ByteBuffer[] stringAttributeArgs;
  }

  enum TestStringAttributeType {
    SPELLOUT(0),
    LOCALE(1);

    private final int value;

    private TestStringAttributeType(int value) {
      this.value = value;
    }

    public int getValue() {
      return value;
    }
  }

  class TestStringAttribute {
    int start;
    int end;
    TestStringAttributeType type;
  }

  class TestStringAttributeSpellOut extends TestStringAttribute {}

  class TestStringAttributeLocale extends TestStringAttribute {
    String locale;
  }

  class TestSemanticsNode {
    TestSemanticsNode() {}

    void addFlag(AccessibilityBridge.Flag flag) {
      flags |= flag.value;
    }

    void addAction(AccessibilityBridge.Action action) {
      actions |= action.value;
    }

    // These fields are declared in the order they should be
    // encoded.
    int id = 0;
    int flags = 0;
    int actions = 0;
    int maxValueLength = 0;
    int currentValueLength = 0;
    int textSelectionBase = 0;
    int textSelectionExtent = 0;
    int platformViewId = -1;
    int scrollChildren = 0;
    int scrollIndex = 0;
    float scrollPosition = 0.0f;
    float scrollExtentMax = 0.0f;
    float scrollExtentMin = 0.0f;
    String label = null;
    List<TestStringAttribute> labelAttributes;
    String value = null;
    List<TestStringAttribute> valueAttributes;
    String increasedValue = null;
    List<TestStringAttribute> increasedValueAttributes;
    String decreasedValue = null;
    List<TestStringAttribute> decreasedValueAttributes;
    String hint = null;
    List<TestStringAttribute> hintAttributes;
    int textDirection = 0;
    float left = 0.0f;
    float top = 0.0f;
    float right = 0.0f;
    float bottom = 0.0f;
    float[] transform =
        new float[] {
          1.0f, 0.0f, 0.0f, 0.0f,
          0.0f, 1.0f, 0.0f, 0.0f,
          0.0f, 0.0f, 1.0f, 0.0f,
          0.0f, 0.0f, 0.0f, 1.0f
        };
    final List<TestSemanticsNode> children = new ArrayList<TestSemanticsNode>();

    public void addChild(TestSemanticsNode child) {
      children.add(child);
    }
    // custom actions not supported.

    TestSemanticsUpdate toUpdate() {
      ArrayList<String> strings = new ArrayList<String>();
      ByteBuffer bytes = ByteBuffer.allocate(1000);
      ArrayList<ByteBuffer> stringAttributeArgs = new ArrayList<ByteBuffer>();
      addToBuffer(bytes, strings, stringAttributeArgs);
      bytes.flip();
      return new TestSemanticsUpdate(
          bytes,
          strings.toArray(new String[strings.size()]),
          stringAttributeArgs.toArray(new ByteBuffer[stringAttributeArgs.size()]));
    }

    protected void addToBuffer(
        ByteBuffer bytes, ArrayList<String> strings, ArrayList<ByteBuffer> stringAttributeArgs) {
      bytes.putInt(id);
      bytes.putInt(flags);
      bytes.putInt(actions);
      bytes.putInt(maxValueLength);
      bytes.putInt(currentValueLength);
      bytes.putInt(textSelectionBase);
      bytes.putInt(textSelectionExtent);
      bytes.putInt(platformViewId);
      bytes.putInt(scrollChildren);
      bytes.putInt(scrollIndex);
      bytes.putFloat(scrollPosition);
      bytes.putFloat(scrollExtentMax);
      bytes.putFloat(scrollExtentMin);
      updateString(label, labelAttributes, bytes, strings, stringAttributeArgs);
      updateString(value, valueAttributes, bytes, strings, stringAttributeArgs);
      updateString(increasedValue, increasedValueAttributes, bytes, strings, stringAttributeArgs);
      updateString(decreasedValue, decreasedValueAttributes, bytes, strings, stringAttributeArgs);
      updateString(hint, hintAttributes, bytes, strings, stringAttributeArgs);
      bytes.putInt(textDirection);
      bytes.putFloat(left);
      bytes.putFloat(top);
      bytes.putFloat(right);
      bytes.putFloat(bottom);
      // transform.
      for (int i = 0; i < 16; i++) {
        bytes.putFloat(transform[i]);
      }
      // children in traversal order.
      bytes.putInt(children.size());
      for (TestSemanticsNode node : children) {
        bytes.putInt(node.id);
      }
      // children in hit test order.
      for (TestSemanticsNode node : children) {
        bytes.putInt(node.id);
      }
      // custom actions
      bytes.putInt(0);
      // child nodes
      for (TestSemanticsNode node : children) {
        node.addToBuffer(bytes, strings, stringAttributeArgs);
      }
    }
  }

  static void updateString(
      String value,
      List<TestStringAttribute> attributes,
      ByteBuffer bytes,
      ArrayList<String> strings,
      ArrayList<ByteBuffer> stringAttributeArgs) {
    if (value == null) {
      bytes.putInt(-1);
    } else {
      strings.add(value);
      bytes.putInt(strings.size() - 1);
    }
    // attributes
    if (attributes == null || attributes.isEmpty()) {
      bytes.putInt(-1);
      return;
    }
    bytes.putInt(attributes.size());
    for (TestStringAttribute attribute : attributes) {
      bytes.putInt(attribute.start);
      bytes.putInt(attribute.end);
      bytes.putInt(attribute.type.getValue());
      switch (attribute.type) {
        case SPELLOUT:
          bytes.putInt(-1);
          break;
        case LOCALE:
          bytes.putInt(stringAttributeArgs.size());
          TestStringAttributeLocale localeAttribute = (TestStringAttributeLocale) attribute;
          stringAttributeArgs.add(Charset.forName("UTF-8").encode(localeAttribute.locale));
          break;
      }
    }
  }
}