Add a warning when developing an extension that uses old manifest version.

chrome/common/extensions/manifest_tests/extension_manifests_manifest_version_unittest.cc

+// Copyright (c) 2012 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/common/extensions/manifest_tests/extension_manifest_test.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+using extensions::Extension;
+
+namespace errors = extension_manifest_errors;
+
+TEST_F(ExtensionManifestTest, ManifestVersionWarning) {
+  scoped_ptr<DictionaryValue> manifest1(new DictionaryValue());
+  manifest1->SetString("name", "Miles");
+  manifest1->SetString("version", "0.55");
+
+  scoped_ptr<DictionaryValue> manifest2(manifest1->DeepCopy());
+  manifest2->SetInteger("manifest_version", 1);
+
+  scoped_ptr<DictionaryValue> manifest3(manifest1->DeepCopy());
+  manifest3->SetInteger("manifest_version", 2);
+
+  struct {
+    const char* test_name;
+    DictionaryValue* manifest;
+    bool expect_warning;
+  } test_data[] = {
+    { "default_manifest_version", manifest1.get(), true },
+    { "manifest_version_1", manifest2.get(), true },
+    { "manifest_version_2", manifest3.get(), false }
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(test_data); ++i) {
+    scoped_refptr<Extension> extension(
+        LoadAndExpectSuccess(Manifest(test_data[i].manifest,
+                                      test_data[i].test_name),
+                             Extension::LOAD));
+    if (test_data[i].expect_warning) {
+      EXPECT_THAT(
+          extension->install_warnings(),
+          testing::Contains(
+              testing::Field(
+                  &Extension::InstallWarning::message,
+                  testing::HasSubstr(
+                      "Manifest version 1 will be unsupported soon."))))
+          << test_data[i].test_name;
+    } else {
+      EXPECT_THAT(
+          extension->install_warnings(),
+          testing::Not(
+              testing::Contains(
+                  testing::Field(
+                      &Extension::InstallWarning::message,
+                      testing::HasSubstr(
+                          "Manifest version 1 will be unsupported soon.")))))
+          << test_data[i].test_name;
+    }
+  }
+}