combine base_unittest.py modules from gm and tools

gm/rebaseline_server/compare_rendered_pictures_test.py

 #!/usr/bin/python
 
 """
 Copyright 2014 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Test compare_rendered_pictures.py
 
 TODO(epoger): Create a command to update the expected results (in
 self._output_dir_expected) when appropriate.  For now, you should:
-1. examine the results in self._output_dir_actual and make sure they are ok
+1. examine the results in self.output_dir_actual and make sure they are ok
 2. rm -rf self._output_dir_expected
-3. mv self._output_dir_actual self._output_dir_expected
+3. mv self.output_dir_actual self._output_dir_expected
 Although, if you're using an SVN checkout, this will blow away .svn directories
 within self._output_dir_expected, which wouldn't be good...
 
 """
 
+# System-level imports
 import os
 import subprocess
-import sys
+
+# Must fix up PYTHONPATH before importing from within Skia
+import fix_pythonpath  # pylint: disable=W0611
 
 # Imports from within Skia
 import base_unittest
 import compare_rendered_pictures
+import find_run_binary
+import gm_json
 import results
-import gm_json  # must import results first, so that gm_json will be in sys.path
 
 
 class CompareRenderedPicturesTest(base_unittest.TestCase):
 
   def test_endToEnd(self):
     """Generate two sets of SKPs, run render_pictures over both, and compare
     the results."""
     self._generate_skps_and_run_render_pictures(
         subdir='before_patch', skpdict={
             'changed.skp': 200,
             'unchanged.skp': 100,
             'only-in-before.skp': 128,
         })
     self._generate_skps_and_run_render_pictures(
         subdir='after_patch', skpdict={
             'changed.skp': 201,
             'unchanged.skp': 100,
             'only-in-after.skp': 128,
         })
 
     results_obj = compare_rendered_pictures.RenderedPicturesComparisons(
-        actuals_root=self._temp_dir,
+        actuals_root=self.temp_dir,
         subdirs=('before_patch', 'after_patch'),
-        generated_images_root=self._temp_dir,
+        generated_images_root=self.temp_dir,
         diff_base_url='/static/generated-images')
     results_obj.get_timestamp = mock_get_timestamp
 
     gm_json.WriteToFile(
         results_obj.get_packaged_results_of_type(
             results.KEY__HEADER__RESULTS_ALL),
-        os.path.join(self._output_dir_actual, 'compare_rendered_pictures.json'))
+        os.path.join(self.output_dir_actual, 'compare_rendered_pictures.json'))
 
   def _generate_skps_and_run_render_pictures(self, subdir, skpdict):
     """Generate SKPs and run render_pictures on them.
 
     Args:
-      subdir: subdirectory (within self._temp_dir) to write all files into
+      subdir: subdirectory (within self.temp_dir) to write all files into
       skpdict: {skpname: redvalue} dictionary describing the SKP files to render
     """
-    out_path = os.path.join(self._temp_dir, subdir)
+    out_path = os.path.join(self.temp_dir, subdir)
     os.makedirs(out_path)
     for skpname, redvalue in skpdict.iteritems():
       self._run_skpmaker(
           output_path=os.path.join(out_path, skpname), red=redvalue)
 
     # TODO(epoger): Add --mode tile 256 256 --writeWholeImage to the unittest,
     # and fix its result!  (imageURLs within whole-image entries are wrong when
     # I tried adding that)
-    binary = self.find_path_to_program('render_pictures')
+    binary = find_run_binary.find_path_to_program('render_pictures')
     return subprocess.check_output([
         binary,
         '--config', '8888',
         '-r', out_path,
         '--writeChecksumBasedFilenames',
         '--writeJsonSummaryPath', os.path.join(out_path, 'summary.json'),
         '--writePath', out_path])
 
   def _run_skpmaker(self, output_path, red=0, green=0, blue=0,
                     width=640, height=400):
     """Runs the skpmaker binary to generate SKP with known characteristics.
 
     Args:
       output_path: Filepath to write the SKP into.
       red: Value of red color channel in image, 0-255.
       green: Value of green color channel in image, 0-255.
       blue: Value of blue color channel in image, 0-255.
       width: Width of canvas to create.
       height: Height of canvas to create.
     """
-    binary = self.find_path_to_program('skpmaker')
+    binary = find_run_binary.find_path_to_program('skpmaker')
     return subprocess.check_output([
         binary,
         '--red', str(red),
         '--green', str(green),
         '--blue', str(blue),
         '--width', str(width),
         '--height', str(height),
         '--writePath', str(output_path)])
 
 def mock_get_timestamp():
   """Mock version of BaseComparisons.get_timestamp() for testing."""
   return 12345678
 
 
 def main():
   base_unittest.main(CompareRenderedPicturesTest)
 
 
 if __name__ == '__main__':
   main()