Send screenshots back to the client for debugging

chrome/test/webdriver/chromedriver_tests.py

Index: chrome/test/webdriver/chromedriver_tests.py
diff --git a/chrome/test/webdriver/chromedriver_tests.py b/chrome/test/webdriver/chromedriver_tests.py
index 55a7bd37ec7dcb538199b9e0a80b18170d727122..f4aa44d85a87363bf1434d5a25c09fa4afb493dc 100755
--- a/chrome/test/webdriver/chromedriver_tests.py
+++ b/chrome/test/webdriver/chromedriver_tests.py
@@ -10,10 +10,12 @@ If your test is testing a specific part of the WebDriver API, consider adding
 it to the appropriate place in the WebDriver tree instead.
 """
 
-import platform
+import hashlib
 import os
+import platform
 import sys
 import unittest
+import urllib
 import urllib2
 import urlparse
 
@@ -83,6 +85,28 @@ class BasicTest(unittest.TestCase):
   def tearDown(self):
     self._launcher.Kill()
 
+  @staticmethod
+  def DataDir():
+    """Returns the path to the data dir chrome/test/data."""
+    return os.path.normpath(
+      os.path.join(os.path.dirname(__file__), os.pardir, "data"))
+
+  @staticmethod
+  def GetFileURLForPath(path):
+    """Get file:// url for the given path.
+    Also quotes the url using urllib.quote().
+    """
+    abs_path = os.path.abspath(path)
+    if sys.platform == 'win32':
+      # Don't quote the ':' in drive letter ( say, C: ) on win.
+      # Also, replace '\' with '/' as expected in a file:/// url.
+      drive, rest = os.path.splitdrive(abs_path)
+      quoted_path = drive.upper() + urllib.quote((rest.replace('\\', '/')))
+      return 'file:///' + quoted_path
+    else:
+      quoted_path = urllib.quote(abs_path)
+      return 'file://' + quoted_path
+
   def testShouldReturn404WhenSentAnUnknownCommandURL(self):
     request_url = self._launcher.GetURL() + '/foo'
     try:
@@ -148,6 +172,32 @@ class CookieTest(unittest.TestCase):
     self.assertEqual(cookie_dict, None)
 
 
+class ScreenshotTest(unittest.TestCase):
+  """Tests to verify screenshot retrieval"""
+
+  SEARCH = "http://www.google.com/webhp?hl=en"
+  NEWS = "http://www.google.com/news"
+  REDBOX = "automation_proxy_snapshot/set_size.html"
+
+  def setUp(self):
+    self._launcher = ChromeDriverLauncher()
+    self._driver = WebDriver(self._launcher.GetURL(), {})
+
+  def tearDown(self):
+    self._driver.quit()
+    self._launcher.Kill()
+
+  def testScreenCaptureAgainstReference(self):
+    # Create a red square of 2000x2000 pixels.
+    url = BasicTest.GetFileURLForPath(os.path.join(BasicTest.DataDir(),
+                                                   self.REDBOX))
+    url = url + "?2000,2000"
+    self._driver.get(url)
+    s = self._driver.get_screenshot_as_base64();
+    h = hashlib.md5(s).hexdigest()
+    # Compare the PNG created to the reference hash.
+    self.assertTrue(h, '12c0ade27e3875da3d8866f52d2fa84f')
+
 class SessionTest(unittest.TestCase):
   """Tests dealing with WebDriver sessions."""