Adding unit tests for PrerenderDispatcher.

BUG=None
TEST=None


Review URL: https://chromiumcodereview.appspot.com/10424002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138877 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 128 insertions, 0 deletions

diff --git a/chrome/renderer/prerender/prerender_dispatcher.h b/chrome/renderer/prerender/prerender_dispatcher.h
index 3ee2b7f..6896804 100644
--- a/chrome/renderer/prerender/prerender_dispatcher.h
+++ b/chrome/renderer/prerender/prerender_dispatcher.h
@@ -31,6 +31,8 @@ class PrerenderDispatcher : public content::RenderProcessObserver {
   bool IsPrerenderURL(const GURL & url) const;
 
  private:
+  friend class PrerenderDispatcherTest;
+
   void OnAddPrerenderURL(const GURL& url);
   void OnRemovePrerenderURL(const GURL& url);
 
diff --git a/chrome/renderer/prerender/prerender_dispatcher_unittest.cc b/chrome/renderer/prerender/prerender_dispatcher_unittest.cc
new file mode 100644
index 0000000..f7170ba
--- /dev/null
+++ b/chrome/renderer/prerender/prerender_dispatcher_unittest.cc
@@ -0,0 +1,126 @@
+// 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/renderer/prerender/prerender_dispatcher.h"
+
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "googleurl/src/gurl.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace prerender {
+
+class PrerenderDispatcherTest : public testing::Test {
+ public:
+  PrerenderDispatcherTest() {}
+
+  bool is_prerender_url(const GURL& url) const {
+    return prerender_dispatcher_.IsPrerenderURL(url);
+  }
+
+  const PrerenderDispatcher::PrerenderMap& urls() const {
+    return prerender_dispatcher_.prerender_urls_;
+  }
+
+  void AddURL(const GURL& url) { prerender_dispatcher_.OnAddPrerenderURL(url); }
+  void RemoveURL(const GURL& url) {
+    prerender_dispatcher_.OnRemovePrerenderURL(url);
+  }
+
+  int GetCountForURL(const GURL& url) const {
+    PrerenderDispatcher::PrerenderMap::const_iterator entry = urls().find(url);
+    if (entry == urls().end())
+      return 0;
+    EXPECT_GT(entry->second, 0);
+    return entry->second;
+  }
+
+ private:
+  PrerenderDispatcher prerender_dispatcher_;
+  DISALLOW_COPY_AND_ASSIGN(PrerenderDispatcherTest);
+};
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherEmpty) {
+  EXPECT_EQ(0U, urls().size());
+}
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherSingleAdd) {
+  GURL foo_url = GURL("http://foo.com");
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  EXPECT_EQ(1, GetCountForURL(foo_url));
+}
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherMultipleAdd) {
+  GURL foo_url = GURL("http://foo.com");
+  GURL bar_url = GURL("http://bar.com");
+
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  EXPECT_FALSE(is_prerender_url(bar_url));
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  EXPECT_FALSE(is_prerender_url(bar_url));
+
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  EXPECT_FALSE(is_prerender_url(bar_url));
+  EXPECT_EQ(2, GetCountForURL(foo_url));
+
+  AddURL(bar_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  EXPECT_TRUE(is_prerender_url(bar_url));
+  EXPECT_EQ(2, GetCountForURL(foo_url));
+  EXPECT_EQ(1, GetCountForURL(bar_url));
+}
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherSingleRemove) {
+  GURL foo_url = GURL("http://foo.com");
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  RemoveURL(foo_url);
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  EXPECT_EQ(0, GetCountForURL(foo_url));
+}
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherMultipleRemove) {
+  GURL foo_url = GURL("http://foo.com");
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  EXPECT_EQ(2, GetCountForURL(foo_url));
+
+  RemoveURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  EXPECT_EQ(1, GetCountForURL(foo_url));
+
+  RemoveURL(foo_url);
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  EXPECT_EQ(0, GetCountForURL(foo_url));
+}
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherRemoveWithoutAdd) {
+  GURL foo_url = GURL("http://foo.com");
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  RemoveURL(foo_url);
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  EXPECT_EQ(0, GetCountForURL(foo_url));
+}
+
+TEST_F(PrerenderDispatcherTest, PrerenderDispatcherRemoveTooMany) {
+  GURL foo_url = GURL("http://foo.com");
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  AddURL(foo_url);
+  EXPECT_TRUE(is_prerender_url(foo_url));
+  RemoveURL(foo_url);
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  RemoveURL(foo_url);
+  EXPECT_FALSE(is_prerender_url(foo_url));
+  EXPECT_EQ(0, GetCountForURL(foo_url));
+}
+
+}  // end namespace prerender