trivial: tiny changes to test code

src/allmydata/test/test_encode.py

@@ -433,7 +433,7 @@ class Roundtrip(unittest.TestCase, testutil.ShouldFailMixin):
                       target=target)
         # that fires with newdata
         def _downloaded((newdata, fd)):
-            self.failUnless(newdata == data)
+            self.failUnless(newdata == data, str((len(newdata), len(data))))
             return fd
         d.addCallback(_downloaded)
         return d

src/allmydata/test/test_immutable.py

@@ -262,7 +262,7 @@ class Test(ShareManglingMixin, unittest.TestCase):
 
         def _upload_a_file(ignored):
             client = self.clients[0]
-            # We need multiple segments to test crypttext hash tree's that are non-trivial
+            # We need multiple segments to test crypttext hash trees that are non-trivial
             # (i.e. they have more than just one hash in them).
             client.DEFAULT_ENCODING_PARAMETERS['max_segment_size'] = 12
             d2 = client.upload(upload.Data(TEST_DATA, convergence=""))