The ContentType repr() incorrectly used , instead of ;.

NEWS

@@ -25,6 +25,12 @@ Improvements
 
 A simple bug fix, and better error messages when you don't up-call.
 
+Changes
+-------
+
+* ``testtools.content_type.ContentType`` incorrectly used ',' rather than ';'
+  to separate parameters. (Robert Collins)
+
 Improvements
 ------------
 

testtools/content_type.py

@@ -29,7 +29,7 @@ class ContentType(object):
     def __repr__(self):
         if self.parameters:
             params = '; '
-            params += ', '.join(
+            params += '; '.join(
                 sorted('%s="%s"' % (k, v) for k, v in self.parameters.items()))
         else:
             params = ''

testtools/tests/test_content_type.py

@@ -43,7 +43,7 @@ class TestContentType(TestCase):
         content_type = ContentType(
             'text', 'plain', {'foo': 'bar', 'baz': 'qux'})
         self.assertThat(
-            repr(content_type), Equals('text/plain; baz="qux", foo="bar"'))
+            repr(content_type), Equals('text/plain; baz="qux"; foo="bar"'))
 
 
 class TestBuiltinContentTypes(TestCase):