Add a function to send scripts from a browsertest to an extension's background page.

chrome/browser/extensions/browsertest_util_browsertest.cc

+// Copyright (c) 2013 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 "chrome/browser/extensions/browsertest_util.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "chrome/browser/extensions/extension_browsertest.h"
+#include "chrome/browser/extensions/test_extension_dir.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "testing/gtest/include/gtest/gtest-spi.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace extensions {
+namespace {
+
+// TODO(jyasskin): It should be possible to test extensions without
+// inheriting from the monolithic ExtensionBrowserTest.
+class ExtensionBrowsertestUtilTest : public ExtensionBrowserTest {
+};
+
+IN_PROC_BROWSER_TEST_F(ExtensionBrowsertestUtilTest,
+                       ExecuteScriptInBackground) {
+  TestExtensionDir ext_dir;
+  ext_dir.WriteManifest(
+      "{\n"
+      "  \"name\": \"ExecuteScript extension\",\n"
+      "  \"version\": \"0.1\",\n"
+      "  \"manifest_version\": 2,\n"
+      "  \"background\": {\"scripts\": [\"background.js\"]}\n"
+      "}\n");
+  ext_dir.WriteFile(FILE_PATH_LITERAL("background.js"), "");
+  const Extension* extension = LoadExtension(ext_dir.unpacked_path());
+  ASSERT_TRUE(extension);
+  EXPECT_EQ(extension->id(),
+            browsertest_util::ExecuteScriptInBackgroundPage(
+                profile(),
+                extension->id(),
+                "window.domAutomationController.send(chrome.runtime.id);"));
+
+  // This test checks that executing a script doesn't block the browser process.
+  EXPECT_EQ(base::IntToString(browser()->tab_strip_model()->count()),
+            browsertest_util::ExecuteScriptInBackgroundPage(
+                profile(),
+                extension->id(),
+                "chrome.tabs.query({}, function(result) {\n"
+                "  window.domAutomationController.send('' + result.length);\n"
+                "});"));
+
+  // An argument that isn't a string should cause a failure, not a hang.
+  EXPECT_NONFATAL_FAILURE(browsertest_util::ExecuteScriptInBackgroundPage(
+                              profile(),
+                              extension->id(),
+                              "window.domAutomationController.send(3);"),
+                          "send(3)");
+}
+
+}  // namespace
+}  // namespace extensions