[WebPayments] Implement state transitions in desktop WebPayments dialog.

chrome/browser/ui/views/payments/view_stack_unittest.cc

+// Copyright 2016 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 "base/observer_list.h"
+#include "base/run_loop.h"
+#include "chrome/browser/ui/views/payments/view_stack.h"
+#include "chrome/browser/ui/views/payments/view_stack_state.h"
+#include "ui/gfx/animation/test_animation_delegate.h"
+#include "ui/views/test/views_test_base.h"
+
+class TestStackState : public ViewStackState {
+ public:
+  class Observer {
+   public:
+    Observer() : state_deleted_(false) {}
+
+    void OnStateBeingDeleted() {
+      state_deleted_ = true;
+    }
+
+    bool state_deleted() { return state_deleted_; }
+
+   private:
+    bool state_deleted_;
+  };
+
+  TestStackState() {}
+  ~TestStackState() override {
+    for (auto& observer: observers_) {
+      observer.OnStateBeingDeleted();
+    }
+  }
+
+  void AddObserver(Observer* observer) {
+    observers_.AddObserver(observer);
+  }
+
+ private:
+  views::View* CreateView() override {
+    return new views::View;
+  }
+
+  base::ObserverList<Observer> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestStackState);
+};
+
+class ViewStackTest : public views::ViewsTestBase {
+ public:
+  ViewStackTest() {
+    view_stack_.reset(new ViewStack(base::MakeUnique<TestStackState>()));
+  }
+
+  std::unique_ptr<ViewStack> view_stack_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewStackTest);
+};
+
+TEST_F(ViewStackTest, TestInitialStateAddedAsChildView) {
+  EXPECT_EQ(1, view_stack_->child_count());
+}
+
+TEST_F(ViewStackTest, TestPushStateAddsViewToChildren) {
+  view_stack_->PushState(base::MakeUnique<TestStackState>());
+  EXPECT_EQ(2, view_stack_->child_count());
+}
+
+TEST_F(ViewStackTest, TestPopStateRemovesChildViewAndCleansUpState) {
+  view_stack_->SetBounds(0, 0, 10, 10);
+
+  TestStackState::Observer observer;
+  std::unique_ptr<TestStackState> state = base::MakeUnique<TestStackState>();
+  state->AddObserver(&observer);
+  views::View* state_view = state->GetView();
+
+  view_stack_->PushState(std::move(state));
+  EXPECT_TRUE(view_stack_->slide_in_animator_->IsAnimating());
+  view_stack_->slide_in_animator_->SetAnimationDelegate(
+      state_view,
+      std::unique_ptr<gfx::AnimationDelegate>(
+          new gfx::TestAnimationDelegate()));
+
+  base::RunLoop().Run();
+  EXPECT_FALSE(view_stack_->slide_in_animator_->IsAnimating());
+  view_stack_->PopState();
+
+  EXPECT_TRUE(view_stack_->slide_out_animator_->IsAnimating());
+  view_stack_->slide_out_animator_->SetAnimationDelegate(
+      state_view,
+      std::unique_ptr<gfx::AnimationDelegate>(
+          new gfx::TestAnimationDelegate()));
+
+  base::RunLoop().Run();
+  EXPECT_FALSE(view_stack_->slide_out_animator_->IsAnimating());
+
+  ASSERT_TRUE(observer.state_deleted());
+}
+
+TEST_F(ViewStackTest, TestDeletingViewCleansUpState) {
+  view_stack_->SetBounds(0, 0, 10, 10);
+
+  TestStackState::Observer observer;
+  std::unique_ptr<TestStackState> state = base::MakeUnique<TestStackState>();
+  state->AddObserver(&observer);
+  views::View* state_view = state->GetView();
+
+  view_stack_->PushState(std::move(state));
+  EXPECT_TRUE(view_stack_->slide_in_animator_->IsAnimating());
+  view_stack_->slide_in_animator_->SetAnimationDelegate(
+      state_view,
+      std::unique_ptr<gfx::AnimationDelegate>(
+          new gfx::TestAnimationDelegate()));
+
+  base::RunLoop().Run();
+  EXPECT_FALSE(view_stack_->slide_in_animator_->IsAnimating());
+  view_stack_->PopState();
+
+  EXPECT_TRUE(view_stack_->slide_out_animator_->IsAnimating());
+  view_stack_.reset();
+
+  ASSERT_TRUE(observer.state_deleted());
+}