Add tests for QuickAnswersView

Add a test-fixture and basic tests for QuickAnswersView. Current tests
verify the view's positioning with respect to its anchor and more tests
will be added in follow-up CLs.

Bug: b:157182213
Test: Built and ran ash:ash_unittests on local build.
Change-Id: I44634313ff6538e48ef7375641e1971bfc989ab1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210977Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Abhijeet Singh <siabhijeet@google.com>
Cr-Commit-Position: refs/heads/master@{#771207}

ash/BUILD.gn

@@ -1962,6 +1962,7 @@ test("ash_unittests") {
     "power/hfp_battery_listener_unittest.cc",
     "power/hid_battery_listener_unittest.cc",
     "power/hid_battery_util_unittest.cc",
+    "quick_answers/ui/quick_answers_view_unittest.cc",
     "root_window_controller_unittest.cc",
     "rotator/screen_rotation_animation_unittest.cc",
     "rotator/screen_rotation_animator_unittest.cc",

ash/quick_answers/quick_answers_controller_impl.h

@@ -80,6 +80,10 @@ class ASH_EXPORT QuickAnswersControllerImpl
   // Open Quick-Answers dogfood URL.
   void OpenQuickAnswersDogfoodLink();
 
+  QuickAnswersUiController* quick_answers_ui_controller() {
+    return quick_answers_ui_controller_.get();
+  }
+
  private:
   void MaybeDismissQuickAnswersConsent();
 

ash/quick_answers/ui/quick_answers_view_unittest.cc

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/quick_answers/ui/quick_answers_view.h"
+
+#include "ash/quick_answers/quick_answers_controller_impl.h"
+#include "ash/test/ash_test_base.h"
+
+namespace ash {
+
+namespace {
+
+constexpr int kMarginDip = 10;
+constexpr int kSmallTop = 30;
+constexpr gfx::Rect kDefaultAnchorBoundsInScreen =
+    gfx::Rect(gfx::Point(500, 250), gfx::Size(80, 140));
+
+}  // namespace
+
+class QuickAnswersViewsTest : public AshTestBase {
+ protected:
+  QuickAnswersViewsTest() = default;
+  QuickAnswersViewsTest(const QuickAnswersViewsTest&) = delete;
+  QuickAnswersViewsTest& operator=(const QuickAnswersViewsTest&) = delete;
+  ~QuickAnswersViewsTest() override = default;
+
+  // AshTestBase:
+  void SetUp() override {
+    AshTestBase::SetUp();
+
+    dummy_anchor_bounds_ = kDefaultAnchorBoundsInScreen;
+    controller_ = std::make_unique<QuickAnswersControllerImpl>();
+    CreateQuickAnswersView(dummy_anchor_bounds_, "dummy_title");
+  }
+
+  void TearDown() override {
+    quick_answers_view_.reset();
+    controller_.reset();
+
+    AshTestBase::TearDown();
+  }
+
+  // Currently instantiated QuickAnswersView instance.
+  QuickAnswersView* view() { return quick_answers_view_.get(); }
+
+  // Needed to poll the current bounds of the mock anchor.
+  const gfx::Rect& dummy_anchor_bounds() { return dummy_anchor_bounds_; }
+
+  // Create a QuickAnswersView instance with custom anchor-bounds and
+  // title-text.
+  void CreateQuickAnswersView(const gfx::Rect anchor_bounds,
+                              const char* title) {
+    // Reset existing view if any.
+    quick_answers_view_.reset();
+
+    dummy_anchor_bounds_ = anchor_bounds;
+    quick_answers_view_ = std::make_unique<QuickAnswersView>(
+        dummy_anchor_bounds_, title,
+        controller_->quick_answers_ui_controller());
+  }
+
+ private:
+  std::unique_ptr<QuickAnswersView> quick_answers_view_;
+  std::unique_ptr<QuickAnswersControllerImpl> controller_;
+  gfx::Rect dummy_anchor_bounds_;
+};
+
+TEST_F(QuickAnswersViewsTest, DefaultLayoutAroundAnchor) {
+  gfx::Rect view_bounds = view()->GetBoundsInScreen();
+  gfx::Rect anchor_bounds = dummy_anchor_bounds();
+
+  // Vertically aligned with anchor.
+  EXPECT_EQ(view_bounds.x(), anchor_bounds.x());
+  EXPECT_EQ(view_bounds.right(), anchor_bounds.right());
+
+  // View is positioned above the anchor.
+  EXPECT_EQ(view_bounds.bottom() + kMarginDip, anchor_bounds.y());
+}
+
+TEST_F(QuickAnswersViewsTest, PositionedBelowAnchorIfLessSpaceAbove) {
+  gfx::Rect anchor_bounds = dummy_anchor_bounds();
+  // Update anchor-bounds' position so that it does not leave enough vertical
+  // space above it to show the QuickAnswersView.
+  anchor_bounds.set_y(kSmallTop);
+
+  CreateQuickAnswersView(anchor_bounds, "dummy_title");
+  gfx::Rect view_bounds = view()->GetBoundsInScreen();
+
+  // Anchor is positioned above the view.
+  EXPECT_EQ(anchor_bounds.bottom() + kMarginDip, view_bounds.y());
+}
+
+}  // namespace ash