Add a convenience function for string content.

testtools/content.py

@@ -5,7 +5,7 @@
 import codecs
 
 from testtools.compat import _b
-from testtools.content_type import ContentType
+from testtools.content_type import ContentType, UTF8_TEXT
 from testtools.testresult import TestResult
 
 
@@ -89,3 +89,11 @@ class TracebackContent(Content):
         value = self._result._exc_info_to_unicode(err, test)
         super(TracebackContent, self).__init__(
             content_type, lambda: [value.encode("utf8")])
+
+
+def text_content(text):
+    """Create a `Content` object from some text.
+
+    This is useful for adding details which are short strings.
+    """
+    return Content(UTF8_TEXT, lambda: [text.encode('utf8')])

testtools/deferredruntest.py

@@ -179,6 +179,7 @@ class AsynchronousDeferredRunTest(RunTest):
             # present.
             for debug_info in unhandled:
                 f = debug_info.failResult
+                
                 self._got_user_exception(
                     (f.type, f.value, f.tb), 'unhandled-error-in-deferred')
         junk = spinner.clear_junk()

testtools/tests/test_content.py

@@ -3,8 +3,8 @@
 import unittest
 from testtools import TestCase
 from testtools.compat import _u
-from testtools.content import Content, TracebackContent
-from testtools.content_type import ContentType
+from testtools.content import Content, TracebackContent, text_content
+from testtools.content_type import ContentType, UTF8_TEXT
 from testtools.tests.helpers import an_exc_info
 
 
@@ -68,6 +68,14 @@ class TestTracebackContent(TestCase):
         self.assertEqual(expected, ''.join(list(content.iter_text())))
 
 
+class TestBytesContent(TestCase):
+
+    def test_bytes(self):
+        data = _u("some data")
+        expected = Content(UTF8_TEXT, lambda: [data.encode('utf8')])
+        self.assertEqual(expected, text_content(data))
+
+
 def test_suite():
     from unittest import TestLoader
     return TestLoader().loadTestsFromName(__name__)