Add test to check all current accelerators having keyboard overlay.

chrome/browser/ui/webui/chromeos/keyboard_overlay_ui_browsertest.cc

+// Copyright 2017 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/accelerators/accelerator_table.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/webui/web_ui_test_handler.h"

[xiyuan, 2017/04/12 21:55:50]

not used?

[wutao, 2017/04/12 22:22:19]

This one should be replaced by
#include "content/public/browser/web_ui_message_handler.h"

+#include "chrome/common/url_constants.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "ui/events/keycodes/keyboard_code_conversion.h"
+
+namespace {
+
+class TestWebUIMessageHandler : public content::WebUIMessageHandler {
+ public:
+  MOCK_METHOD1(HandleDidPaint, void(const base::ListValue*));

[xiyuan, 2017/04/12 21:55:50]

Put an empty implementation instead of using gmock since the test does not care
about how this method is called or whether it is called.

[wutao, 2017/04/12 22:22:19]

Done.

+
+  void RegisterMessages() override {
+    web_ui()->RegisterMessageCallback(
+        "didPaint", base::Bind(&TestWebUIMessageHandler::HandleDidPaint,
+                               base::Unretained(this)));
+  }
+};
+
+}  // namespace
+
+using KeyboradOverlayUIBrowserTest = InProcessBrowserTest;
+
+IN_PROC_BROWSER_TEST_F(KeyboradOverlayUIBrowserTest,
+                       ShouldHaveKeyboardOverlay) {
+  ui_test_utils::NavigateToURL(browser(),
+                               GURL(chrome::kChromeUIKeyboardOverlayURL));
+  content::WebContents* web_contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  web_contents->GetWebUI()->AddMessageHandler(
+      base::MakeUnique<TestWebUIMessageHandler>());
+
+  bool is_display_ui_scaling_enabled;
+  ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
+      web_contents,
+      "domAutomationController.send(isDisplayUIScalingEnabled());",
+      &is_display_ui_scaling_enabled));
+
+  for (size_t i = 0; i < ash::kAcceleratorDataLength; ++i) {
+    const ash::AcceleratorData entry = ash::kAcceleratorData[i];
+    // Skip some accelerators in this test:
+    // 1. If the accelerator has no modifier, i.e. ui::EF_NONE, or for "Caps
+    // Lock", such as ui::VKEY_MENU and ui::VKEY_LWIN, the logic to show it on
+    // the keyboard overlay is not by the mapping of
+    // keyboardOverlayData['shortcut'], so it can not be tested by this test.
+    // 2. If it has debug modifiers: ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN |
+    // ui::EF_SHIFT_DOWN
+    if (entry.keycode == ui::VKEY_MENU ||
+        entry.keycode == ui::VKEY_LWIN ||
+        entry.modifiers == ui::EF_NONE ||
+        entry.modifiers ==
+            (ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN | ui::EF_SHIFT_DOWN)) {
+      continue;
+    }
+
+    std::string shortcut;
+    ASSERT_TRUE(content::ExecuteScriptAndExtractString(
+        web_contents,
+        "domAutomationController.send("
+        "  (function(number) {"
+        "       if (!!KEYCODE_TO_LABEL[number]) {"
+        "             return KEYCODE_TO_LABEL[number];"
+        "       } else {"
+        "             return 'NONE';"
+        "       }"
+        "  })(" + std::to_string(static_cast<unsigned int>(entry.keycode)) + ")"
+        ");",
+        &shortcut));
+    if (shortcut == "NONE") {
+      shortcut =
+          static_cast<char>(LocatedToNonLocatedKeyboardCode(entry.keycode));
+    }
+    std::transform(shortcut.begin(), shortcut.end(), shortcut.begin(),

[xiyuan, 2017/04/12 21:55:50]

This is only needed when we cast from a KeyboardCode in line 81, right? If so,
move it into the "if" above. 

Also, use base::ToLowerASCII() instead of std::transform.

[wutao, 2017/04/12 22:22:19]

Done.

+                   ::tolower);
+
+    // The order of the "if" conditions should not be changed because the
+    // modifiers are expected to be alphabetical sorted in the generated
+    // shortcut.
+    if (entry.modifiers & ui::EF_ALT_DOWN)
+      shortcut.append("<>ALT");
+    if (entry.modifiers & ui::EF_CONTROL_DOWN)
+      shortcut.append("<>CTRL");
+    if (entry.modifiers & ui::EF_COMMAND_DOWN)
+      shortcut.append("<>SEARCH");
+    if (entry.modifiers & ui::EF_SHIFT_DOWN)
+      shortcut.append("<>SHIFT");
+
+    if (!is_display_ui_scaling_enabled) {
+      if (shortcut == "-<>CTRL<>SHIFT" || shortcut == "+<>CTRL<>SHIFT" ||
+          shortcut == "0<>CTRL<>SHIFT")
+        continue;
+    }
+
+    bool contains;
+    ASSERT_TRUE(content::ExecuteScriptAndExtractBool(
+        web_contents,
+        "domAutomationController.send("
+        "  !!keyboardOverlayData['shortcut']['" + shortcut + "']"
+        ");",
+        &contains));
+    ASSERT_TRUE(contains) << "Please add the new accelerators to keyboard "
+                             "overlay. Add one entry '" +
+                                 shortcut +
+                                 "' in the 'shortcut' section"
+                                 " at the bottom of the file of "
+                                 "'/chrome/browser/resources/chromeos/"
+                                 "keyboard_overlay_data.js'. Please keep it in "
+                                 "alphabetical order.";
+  }
+}