fixup! corporate_identity_test: use PNG files for reference data

bt5/erp5_corporate_identity_test/TestTemplateItem/portal_components/test.erp5.testCorporateIdentityTemplateList.py

@@ -30,6 +30,7 @@ from Products.Localizer.itools.i18n.accept import AcceptLanguage
 from PIL import Image
 import cStringIO
 import math
+import os.path
 
 
 def changeSkin(skin_name):
@@ -138,10 +139,14 @@ class TestCorporateIdentityTemplateList(ERP5TypeTestCase):
     rms = self.computeImageRenderingRootMeanSquare(test_image_data, expected_image_data)
     if rms <= max_rms:
       return
-    raise AssertionError("%(message)s\nComparing rendered image:\n%(base64_1)s\nWith expected image:\n%(base64_2)s\nRMS: %(rms)s > %(max_rms)s\nAssertionError: %(message)s" % {
+    from Products.ERP5Type.tests.runUnitTest import log_directory
+    if log_directory:
+      with open(os.path.join(log_directory, '%s-expected.png' % self.id()), 'wb') as f:
+        f.write(expected_image_data)
+      with open(os.path.join(log_directory, '%s-actual.png' % self.id()), 'wb') as f:
+        f.write(test_image_data)
+    raise AssertionError("%(message)s\nRMS: %(rms)s > %(max_rms)s\nAssertionError: %(message)s" % {
       "message": message,
-      "base64_1": test_image_data,
-      "base64_2": expected_image_data,
       "rms": rms,
       "max_rms": max_rms,
     })