Implement the basic testing infrastructure for FindRequestManager.

content/browser/find_request_manager_browsertest.cc

Index: content/browser/find_request_manager_browsertest.cc
diff --git a/content/browser/find_request_manager_browsertest.cc b/content/browser/find_request_manager_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0e8c74359d3add681dd2938c0234e77de87710f8
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+++ b/content/browser/find_request_manager_browsertest.cc
@@ -0,0 +1,237 @@
+// Copyright 2016 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 "base/command_line.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_navigation_observer.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "net/dns/mock_host_resolver.h"
+#include "third_party/WebKit/public/web/WebFindOptions.h"
+
+namespace content {
+
+namespace {
+
+const int kInvalidId = -1;
+
+// The results of a find request.
+struct FindResults {
+  int request_id = kInvalidId;
+  int number_of_matches = 0;
+  int active_match_ordinal = 0;
+};
+
+}  // namespace
+
+class TestWebContentsDelegate : public WebContentsDelegate {
+ public:
+  TestWebContentsDelegate()
+      : last_finished_request_id_(kInvalidId),
+        waiting_request_id_(kInvalidId) {}
+  ~TestWebContentsDelegate() override {}
+
+  // Waits for the final reply to the find request with ID |request_id|.
+  void WaitForFinalReply(int request_id) {
+    if (last_finished_request_id_ == request_id)
+      return;
+
+    waiting_request_id_ = request_id;
+    find_message_loop_runner_ = new content::MessageLoopRunner;
+    find_message_loop_runner_->Run();
+  }
+
+  // Returns the current find results.
+  FindResults GetFindResults() {
+    return current_results_;
+  }
+
+ private:
+  // WebContentsDelegate override.
+  void FindReply(WebContents* web_contents,
+                 int request_id,
+                 int number_of_matches,
+                 const gfx::Rect& selection_rect,
+                 int active_match_ordinal,
+                 bool final_update) override {
+    // Update the current results.
+    if (request_id > current_results_.request_id)
+      current_results_.request_id = request_id;
+    if (number_of_matches != -1)
+      current_results_.number_of_matches = number_of_matches;
+    if (active_match_ordinal != -1)
+      current_results_.active_match_ordinal = active_match_ordinal;
+
+    if (final_update)
+      last_finished_request_id_ = request_id;
+
+    // If we are waiting for a final reply and this is it, stop waiting.
+    if (find_message_loop_runner_.get() &&
+        last_finished_request_id_ >= waiting_request_id_) {
+      find_message_loop_runner_->Quit();
+    }
+  }
+
+  // The latest known results from the current find request.
+  FindResults current_results_;
+
+  // The ID of the last find request to finish (all replies received).
+  int last_finished_request_id_;
+
+  // If waiting using |find_message_loop_runner_|, this is the ID of the find
+  // request being waited for.
+  int waiting_request_id_;
+
+  scoped_refptr<content::MessageLoopRunner> find_message_loop_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWebContentsDelegate);
+};
+
+class FindRequestManagerTest : public ContentBrowserTest {
+ public:
+  FindRequestManagerTest()
+      : normal_delegate_(nullptr),
+        last_request_id_(0) {}
+  ~FindRequestManagerTest() override {}
+
+  void SetUpOnMainThread() override {
+    host_resolver()->AddRule("*", "127.0.0.1");
+    ASSERT_TRUE(embedded_test_server()->Start());
+
+    // Swap the WebContents's delegate for our test delegate.
+    normal_delegate_ = contents()->GetDelegate();
+    contents()->SetDelegate(&test_delegate_);
+  }
+
+  void TearDownOnMainThread() override {
+    // Swap the WebContents's delegate back to its usual delegate.
+    contents()->SetDelegate(normal_delegate_);
+  }
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    IsolateAllSitesForTesting(command_line);
+  }
+
+ protected:
+  // Navigate to |url| and wait for it to finish loading.
+  void LoadAndWait(const std::string& url) {
+    TestNavigationObserver navigation_observer(contents());
+    NavigateToURL(shell(), embedded_test_server()->GetURL("a.com", url));
+  }
+
+  void Find(const std::string& search_text,
+            const blink::WebFindOptions& options) {
+    contents()->Find(++last_request_id_,
+                     base::UTF8ToUTF16(search_text),
+                     options);
+  }
+
+  void WaitForFinalReply() const {
+    delegate()->WaitForFinalReply(last_request_id_);
+  }
+
+  WebContents* contents() const {
+    return shell()->web_contents();
+  }
+
+  TestWebContentsDelegate* delegate() const {
+    return static_cast<TestWebContentsDelegate*>(contents()->GetDelegate());
+  }
+
+  int last_request_id() const {
+    return last_request_id_;
+  }
+
+ private:
+  TestWebContentsDelegate test_delegate_;
+  WebContentsDelegate* normal_delegate_;
+
+  // The ID of the last find request requested.
+  int last_request_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(FindRequestManagerTest);
+};
+
+// Test basic find-in-page functionality (such as searching forward and
+// backward) and check for correct results at each step.
+IN_PROC_BROWSER_TEST_F(FindRequestManagerTest, Basic) {
+  LoadAndWait("/find_in_page.html");
+
+  blink::WebFindOptions options;
+  Find("result", options);
+  WaitForFinalReply();
+
+  FindResults results = delegate()->GetFindResults();
+  EXPECT_EQ(last_request_id(), results.request_id);
+  EXPECT_EQ(19, results.number_of_matches);
+  EXPECT_EQ(1, results.active_match_ordinal);
+
+  options.findNext = true;
+  for (int i = 2; i <= 10; ++i) {
+    Find("result", options);
+    WaitForFinalReply();
+
+    results = delegate()->GetFindResults();
+    EXPECT_EQ(last_request_id(), results.request_id);
+    EXPECT_EQ(19, results.number_of_matches);
+    EXPECT_EQ(i, results.active_match_ordinal);
+  }
+
+  options.forward = false;
+  for (int i = 9; i >= 5; --i) {
+    Find("result", options);
+    WaitForFinalReply();
+
+    results = delegate()->GetFindResults();
+    EXPECT_EQ(last_request_id(), results.request_id);
+    EXPECT_EQ(19, results.number_of_matches);
+    EXPECT_EQ(i, results.active_match_ordinal);
+  }
+}
+
+// Tests searching for a word character-by-character, as would typically be done
+// by a user typing into the find bar.
+IN_PROC_BROWSER_TEST_F(FindRequestManagerTest, CharacterByCharacter) {
+  LoadAndWait("/find_in_page.html");
+
+  blink::WebFindOptions default_options;
+  Find("r", default_options);
+  Find("re", default_options);
+  Find("res", default_options);
+  Find("resu", default_options);
+  Find("resul", default_options);
+  Find("result", default_options);
+  WaitForFinalReply();
+
+  FindResults results = delegate()->GetFindResults();
+  EXPECT_EQ(last_request_id(), results.request_id);
+  EXPECT_EQ(19, results.number_of_matches);
+  EXPECT_EQ(1, results.active_match_ordinal);
+}
+
+// Test sending a large number of find requests subsequently.
+IN_PROC_BROWSER_TEST_F(FindRequestManagerTest, RapidFire) {
+  LoadAndWait("/find_in_page.html");
+
+  blink::WebFindOptions options;
+  Find("result", options);
+
+  options.findNext = true;
+  for (int i = 2; i <= 1000; ++i)
+    Find("result", options);
+  WaitForFinalReply();
+
+  FindResults results = delegate()->GetFindResults();
+  EXPECT_EQ(last_request_id(), results.request_id);
+  EXPECT_EQ(19, results.number_of_matches);
+  EXPECT_EQ(last_request_id() % results.number_of_matches,
+            results.active_match_ordinal);
+}
+
+}  // namespace content