Fix for single line file modification

tests/patch_test.py

Index: tests/patch_test.py
diff --git a/tests/patch_test.py b/tests/patch_test.py
index b1b4809d37cdbad60c9ca22982ae328a5797445f..671e5c92579fe035bd619662162cc32c14cf0ad9 100755
--- a/tests/patch_test.py
+++ b/tests/patch_test.py
@@ -71,6 +71,11 @@ class PatchTest(unittest.TestCase):
     p = patch.FilePatchDiff('chrome/file.cc', RAW.PATCH, [])
     self._check_patch(p, 'chrome/file.cc', RAW.PATCH, nb_hunks=1)
 
+  def testDifferent(self):
+    name = 'master/unittests/data/processes-summary.dat'
+    p = patch.FilePatchDiff(name, RAW.DIFFERENT, [])
+    self._check_patch(p, name, RAW.DIFFERENT, nb_hunks=1)
+
   def testFilePatchDiffHeaderMode(self):
     p = patch.FilePatchDiff('git_cl/git-cl', GIT.MODE_EXE, [])
     self._check_patch(