Adding unit tests for PrerenderDispatcher.

chrome/renderer/prerender/prerender_dispatcher_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/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 {

[gavinp, 2012/05/24 18:17:30]

Good catch.  That was a style violation, this is not.

+    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