Refactors the auto-launch logic and adds tests for it.

ui/app_list/views/search_box_view_unittest.cc

+// Copyright 2014 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 "ui/app_list/views/search_box_view.h"
+
+#include <cctype>
+#include <map>
+
+#include "base/strings/utf_string_conversions.h"
+#include "ui/app_list/test/app_list_test_view_delegate.h"
+#include "ui/app_list/views/search_box_view_delegate.h"
+#include "ui/views/controls/textfield/textfield.h"
+#include "ui/views/test/widget_test.h"
+
+namespace app_list {
+namespace test {
+
+class KeyPressCounterView : public views::View {
+ public:
+  KeyPressCounterView() : count_(0) {}
+  virtual ~KeyPressCounterView() {}
+
+  int GetCountAndReset() {
+    int count = count_;
+    count_ = 0;
+    return count;
+  }
+
+ private:
+  // Overridden from views::View:
+  virtual bool OnKeyPressed(const ui::KeyEvent& key_event) OVERRIDE {
+    if (!::isalnum(static_cast<int>(key_event.key_code()))) {
+      ++count_;
+      return true;
+    }
+    return false;
+  }
+  int count_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyPressCounterView);
+};
+
+class SearchBoxViewTest : public views::test::WidgetTest,
+                          public SearchBoxViewDelegate {
+ public:
+  SearchBoxViewTest() : query_changed_count_(0) {}
+  virtual ~SearchBoxViewTest() {}
+
+  // Overridden from testing::Test:
+  virtual void SetUp() OVERRIDE {
+    views::test::WidgetTest::SetUp();
+    widget_ = CreateTopLevelPlatformWidget();
+    view_ = new SearchBoxView(this, &view_delegate_);
+    counter_view_ = new KeyPressCounterView();
+    widget_->GetContentsView()->AddChildView(view_);
+    widget_->GetContentsView()->AddChildView(counter_view_);
+    view_->set_contents_view(counter_view_);
+  }
+
+  virtual void TearDown() OVERRIDE {
+    widget_->CloseNow();
+    views::test::WidgetTest::TearDown();
+  }
+
+ protected:
+  SearchBoxView* view() { return view_; }
+
+  void SetUpAutoLaunchTimeout() {
+    // Sets a long timeout to make sure the timeout actualy happening in the

[xiyuan, 2014/02/14 04:55:55]

nit: Can we rephrase a bit?

// Sets a long timeout that lasts longer than the test run.

And maybe rename the function to SetLongAutoLaunchTimeout.
SetupAutoLaunchTimeout is too generic.

[Jun Mukai, 2014/02/14 19:17:27]

Done.

+    // test case.
+    view_delegate_.set_auto_launch_timeout(base::TimeDelta::FromDays(1));
+  }
+
+  base::TimeDelta GetAutoLaunchTimeout() {
+    return view_delegate_.GetAutoLaunchTimeout();
+  }
+
+  void ResetAutoLaunchTimeout() {
+    view_delegate_.set_auto_launch_timeout(base::TimeDelta());
+  }
+
+  int GetContentsViewKeyPressCountAndReset() {
+    return counter_view_->GetCountAndReset();
+  }
+
+  void KeyPress(ui::KeyboardCode key_code) {
+    ui::KeyEvent event(ui::ET_KEY_PRESSED, key_code, ui::EF_NONE, true);
+    view_->search_box()->OnKeyPressed(event);
+    // Emulates the input method.
+    if (::isalnum(static_cast<int>(key_code))) {
+      base::char16 character = ::tolower(static_cast<int>(key_code));
+      view_->search_box()->InsertText(base::string16(1, character));
+    }
+  }
+
+  std::string GetLastQueryAndReset() {
+    base::string16 query = last_query_;
+    last_query_.clear();
+    return UTF16ToUTF8(query);
+  }
+
+  int GetQueryChangedCountAndReset() {
+    int result = query_changed_count_;
+    query_changed_count_ = 0;
+    return result;
+  }
+
+ private:
+  // Overridden from SearchBoxViewDelegate:
+  virtual void QueryChanged(SearchBoxView* sender) OVERRIDE {
+    ++query_changed_count_;
+    last_query_ = sender->search_box()->text();
+  }
+
+  AppListTestViewDelegate view_delegate_;
+  views::Widget* widget_;
+  SearchBoxView* view_;
+  KeyPressCounterView* counter_view_;
+  base::string16 last_query_;
+  int query_changed_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(SearchBoxViewTest);
+};
+
+TEST_F(SearchBoxViewTest, Basic) {
+  (KeyPress(ui::VKEY_A));

[xiyuan, 2014/02/14 04:55:55]

Why we need to wrap KeyPress in ()?

[Jun Mukai, 2014/02/14 19:17:27]

Done.

+  EXPECT_EQ("a", GetLastQueryAndReset());
+  EXPECT_EQ(1, GetQueryChangedCountAndReset());
+  EXPECT_EQ(0, GetContentsViewKeyPressCountAndReset());
+
+  (KeyPress(ui::VKEY_DOWN));
+  EXPECT_EQ(0, GetQueryChangedCountAndReset());
+  EXPECT_EQ(1, GetContentsViewKeyPressCountAndReset());
+
+  view()->ClearSearch();
+  EXPECT_EQ(1, GetQueryChangedCountAndReset());
+  EXPECT_TRUE(GetLastQueryAndReset().empty());
+}
+
+TEST_F(SearchBoxViewTest, CancelAutoLaunch) {
+  SetUpAutoLaunchTimeout();
+  ASSERT_NE(base::TimeDelta(), GetAutoLaunchTimeout());
+
+  // Normal key event cancels the timeout.
+  (KeyPress(ui::VKEY_A));
+  EXPECT_EQ(base::TimeDelta(), GetAutoLaunchTimeout());
+  ResetAutoLaunchTimeout();
+
+  // Unusual key event doesn't cancel -- it will be canceled in
+  // SearchResultListView.
+  SetUpAutoLaunchTimeout();
+  (KeyPress(ui::VKEY_DOWN));
+  EXPECT_NE(base::TimeDelta(), GetAutoLaunchTimeout());
+  ResetAutoLaunchTimeout();
+
+  // Clearing search box also cancels.
+  SetUpAutoLaunchTimeout();
+  view()->ClearSearch();
+  EXPECT_EQ(base::TimeDelta(), GetAutoLaunchTimeout());
+}
+
+}  // namespace test
+}  // namespace app_list