[Linux] test FlViewAccessible

ci/licenses_golden/licenses_flutter

@@ -2102,6 +2102,7 @@ FILE: ../../../flutter/shell/platform/linux/fl_value_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_view.cc
 FILE: ../../../flutter/shell/platform/linux/fl_view_accessible.cc
 FILE: ../../../flutter/shell/platform/linux/fl_view_accessible.h
+FILE: ../../../flutter/shell/platform/linux/fl_view_accessible_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_view_private.h
 FILE: ../../../flutter/shell/platform/linux/key_mapping.cc
 FILE: ../../../flutter/shell/platform/linux/key_mapping.h

shell/platform/linux/BUILD.gn

@@ -203,6 +203,7 @@ executable("flutter_linux_unittests") {
     "fl_texture_gl_test.cc",
     "fl_texture_registrar_test.cc",
     "fl_value_test.cc",
+    "fl_view_accessible_test.cc",
     "testing/fl_test.cc",
     "testing/mock_binary_messenger.cc",
     "testing/mock_binary_messenger_response_handle.cc",

shell/platform/linux/fl_view_accessible_test.cc

@@ -0,0 +1,157 @@
+// 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.
+
+// Included first as it collides with the X11 headers.
+#include "gtest/gtest.h"
+
+#include "flutter/shell/platform/linux/fl_view_accessible.h"
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_engine.h"
+#include "flutter/shell/platform/linux/testing/fl_test.h"
+#include "flutter/shell/platform/linux/testing/mock_signal_handler.h"
+
+TEST(FlViewAccessibleTest, BuildTree) {
+  g_autoptr(FlEngine) engine = make_mock_engine();
+  g_autoptr(FlViewAccessible) accessible = FL_VIEW_ACCESSIBLE(
+      g_object_new(fl_view_accessible_get_type(), "engine", engine, nullptr));
+
+  const int32_t children[] = {111, 222};
+  const FlutterSemanticsNode root_node = {
+      .id = 0,
+      .label = "root",
+      .child_count = 2,
+      .children_in_traversal_order = children,
+  };
+  fl_view_accessible_handle_update_semantics_node(accessible, &root_node);
+
+  const FlutterSemanticsNode child1_node = {.id = 111, .label = "child 1"};
+  fl_view_accessible_handle_update_semantics_node(accessible, &child1_node);
+
+  const FlutterSemanticsNode child2_node = {.id = 222, .label = "child 2"};
+  fl_view_accessible_handle_update_semantics_node(accessible, &child2_node);
+
+  AtkObject* root_object =
+      atk_object_ref_accessible_child(ATK_OBJECT(accessible), 0);
+  EXPECT_STREQ(atk_object_get_name(root_object), "root");
+  EXPECT_EQ(atk_object_get_index_in_parent(root_object), 0);
+  EXPECT_EQ(atk_object_get_n_accessible_children(root_object), 2);
+
+  AtkObject* child1_object = atk_object_ref_accessible_child(root_object, 0);
+  EXPECT_STREQ(atk_object_get_name(child1_object), "child 1");
+  EXPECT_EQ(atk_object_get_parent(child1_object), root_object);
+  EXPECT_EQ(atk_object_get_index_in_parent(child1_object), 0);
+  EXPECT_EQ(atk_object_get_n_accessible_children(child1_object), 0);
+
+  AtkObject* child2_object = atk_object_ref_accessible_child(root_object, 1);
+  EXPECT_STREQ(atk_object_get_name(child2_object), "child 2");
+  EXPECT_EQ(atk_object_get_parent(child2_object), root_object);
+  EXPECT_EQ(atk_object_get_index_in_parent(child2_object), 1);
+  EXPECT_EQ(atk_object_get_n_accessible_children(child2_object), 0);
+}
+
+TEST(FlViewAccessibleTest, AddRemoveChildren) {
+  g_autoptr(FlEngine) engine = make_mock_engine();
+  g_autoptr(FlViewAccessible) accessible = FL_VIEW_ACCESSIBLE(
+      g_object_new(fl_view_accessible_get_type(), "engine", engine, nullptr));
+
+  FlutterSemanticsNode root_node = {
+      .id = 0,
+      .label = "root",
+      .child_count = 0,
+  };
+  fl_view_accessible_handle_update_semantics_node(accessible, &root_node);
+
+  AtkObject* root_object =
+      atk_object_ref_accessible_child(ATK_OBJECT(accessible), 0);
+  EXPECT_EQ(atk_object_get_n_accessible_children(root_object), 0);
+
+  // add child1
+  AtkObject* child1_object = nullptr;
+  {
+    flutter::testing::MockSignalHandler2<gint, AtkObject*> child1_added(
+        root_object, "children-changed::add");
+    EXPECT_SIGNAL2(child1_added, ::testing::Eq(0), ::testing::A<AtkObject*>())
+        .WillOnce(::testing::SaveArg<1>(&child1_object));
+
+    const int32_t children[] = {111};
+    root_node.child_count = 1;
+    root_node.children_in_traversal_order = children;
+    fl_view_accessible_handle_update_semantics_node(accessible, &root_node);
+
+    const FlutterSemanticsNode child1_node = {.id = 111, .label = "child 1"};
+    fl_view_accessible_handle_update_semantics_node(accessible, &child1_node);
+  }
+
+  EXPECT_EQ(atk_object_get_n_accessible_children(root_object), 1);
+  EXPECT_EQ(atk_object_ref_accessible_child(root_object, 0), child1_object);
+
+  EXPECT_STREQ(atk_object_get_name(child1_object), "child 1");
+  EXPECT_EQ(atk_object_get_parent(child1_object), root_object);
+  EXPECT_EQ(atk_object_get_index_in_parent(child1_object), 0);
+  EXPECT_EQ(atk_object_get_n_accessible_children(child1_object), 0);
+
+  // add child2
+  AtkObject* child2_object = nullptr;
+  {
+    flutter::testing::MockSignalHandler2<gint, AtkObject*> child2_added(
+        root_object, "children-changed::add");
+    EXPECT_SIGNAL2(child2_added, ::testing::Eq(1), ::testing::A<AtkObject*>())
+        .WillOnce(::testing::SaveArg<1>(&child2_object));
+
+    const int32_t children[] = {111, 222};
+    root_node.child_count = 2;
+    root_node.children_in_traversal_order = children;
+    fl_view_accessible_handle_update_semantics_node(accessible, &root_node);
+
+    const FlutterSemanticsNode child2_node = {.id = 222, .label = "child 2"};
+    fl_view_accessible_handle_update_semantics_node(accessible, &child2_node);
+  }
+
+  EXPECT_EQ(atk_object_get_n_accessible_children(root_object), 2);
+  EXPECT_EQ(atk_object_ref_accessible_child(root_object, 0), child1_object);
+  EXPECT_EQ(atk_object_ref_accessible_child(root_object, 1), child2_object);
+
+  EXPECT_STREQ(atk_object_get_name(child1_object), "child 1");
+  EXPECT_EQ(atk_object_get_parent(child1_object), root_object);
+  EXPECT_EQ(atk_object_get_index_in_parent(child1_object), 0);
+  EXPECT_EQ(atk_object_get_n_accessible_children(child1_object), 0);
+
+  EXPECT_STREQ(atk_object_get_name(child2_object), "child 2");
+  EXPECT_EQ(atk_object_get_parent(child2_object), root_object);
+  EXPECT_EQ(atk_object_get_index_in_parent(child2_object), 1);
+  EXPECT_EQ(atk_object_get_n_accessible_children(child2_object), 0);
+
+  // remove child1
+  {
+    flutter::testing::MockSignalHandler2<gint, AtkObject*> child1_removed(
+        root_object, "children-changed::remove");
+    EXPECT_SIGNAL2(child1_removed, ::testing::Eq(0),
+                   ::testing::Eq(child1_object));
+
+    const int32_t children[] = {222};
+    root_node.child_count = 1;
+    root_node.children_in_traversal_order = children;
+    fl_view_accessible_handle_update_semantics_node(accessible, &root_node);
+  }
+
+  EXPECT_EQ(atk_object_get_n_accessible_children(root_object), 1);
+  EXPECT_EQ(atk_object_ref_accessible_child(root_object, 0), child2_object);
+
+  EXPECT_STREQ(atk_object_get_name(child2_object), "child 2");
+  EXPECT_EQ(atk_object_get_parent(child2_object), root_object);
+  EXPECT_EQ(atk_object_get_index_in_parent(child2_object), 0);
+  EXPECT_EQ(atk_object_get_n_accessible_children(child2_object), 0);
+
+  // remove child2
+  {
+    flutter::testing::MockSignalHandler2<gint, AtkObject*> child2_removed(
+        root_object, "children-changed::remove");
+    EXPECT_SIGNAL2(child2_removed, ::testing::Eq(0),
+                   ::testing::Eq(child2_object));
+
+    root_node.child_count = 0;
+    fl_view_accessible_handle_update_semantics_node(accessible, &root_node);
+  }
+
+  EXPECT_EQ(atk_object_get_n_accessible_children(root_object), 0);
+}