Escape multi-line console messages

Fixes #411

lib/capybara/webkit/browser.rb

@@ -45,7 +45,7 @@ module Capybara::Webkit
     def console_messages
       command("ConsoleMessages").split("\n").map do |messages|
         parts = messages.split("|", 3)
-        { :source => parts.first, :line_number => Integer(parts[1]), :message => parts.last }
+        { :source => parts.first, :line_number => Integer(parts[1]), :message => parts.last.gsub("\\n", "\n") }
       end
     end
 

spec/driver_spec.rb

@@ -425,6 +425,7 @@ describe Capybara::Webkit::Driver do
             <script type="text/javascript">
               console.log("hello");
               console.log("hello again");
+              console.log("hello\\nnewline");
               oops
             </script>
           </body>
@@ -440,18 +441,22 @@ describe Capybara::Webkit::Driver do
       message.should include :source => url, :message => "hello"
       # QtWebKit returns different line numbers depending on the version
       [5, 6].should include(message[:line_number])
-      driver.console_messages.length.should eq 3
+      driver.console_messages.length.should eq 4
     end
 
     it "logs errors to the console" do
       driver.error_messages.length.should eq 1
     end
 
+    it "supports multi-line console messages" do
+      message = driver.console_messages[2]
+      message[:message].should == "hello\nnewline"
+    end
+
     it "empties the array when reset" do
       driver.reset!
       driver.console_messages.should be_empty
     end
-
   end
 
   context "javascript dialog interaction" do

src/WebPage.cpp

@@ -134,7 +134,7 @@ QVariant WebPage::invokeCapybaraFunction(QString &name, const QStringList &argum
 }
 
 void WebPage::javaScriptConsoleMessage(const QString &message, int lineNumber, const QString &sourceID) {
-  QString fullMessage = QString::number(lineNumber) + "|" + message;
+  QString fullMessage = QString::number(lineNumber) + "|" + QString(message).replace("\n", "\\n");;
   if (!sourceID.isEmpty())
     fullMessage = sourceID + "|" + fullMessage;
   m_consoleMessages.append(fullMessage);