Add the twisted log unconditionally.

testtools/deferredruntest.py

@@ -216,6 +216,9 @@ class AsynchronousDeferredRunTest(RunTest):
             [error_observer.gotEvent, full_observer.emit],
             self._blocking_run_deferred, spinner)
 
+        self.case.addDetail(
+            'twisted-log', Content(UTF8_TEXT, full_log.readlines))
+
         logged_errors = error_observer.flushErrors()
         for logged_error in logged_errors:
             successful = False
@@ -239,9 +242,6 @@ class AsynchronousDeferredRunTest(RunTest):
 
         if successful:
             self.result.addSuccess(self.case, details=self.case.getDetails())
-        else:
-            self.case.addDetail(
-                'twisted-log', Content(UTF8_TEXT, full_log.readlines))
 
     def _run_user(self, function, *args):
         """Run a user-supplied function.

testtools/tests/test_deferredruntest.py

@@ -9,6 +9,9 @@ from testtools import (
     skipIf,
     TestCase,
     )
+from testtools.content import (
+    text_content,
+    )
 from testtools.deferredruntest import (
     assert_fails_with,
     AsynchronousDeferredRunTest,
@@ -40,10 +43,6 @@ class X(object):
             self.calls.append('tearDown')
             super(X.Base, self).tearDown()
 
-    class Success(Base):
-        expected_calls = ['setUp', 'test', 'tearDown', 'clean-up']
-        expected_results = [['addSuccess']]
-
     class ErrorInSetup(Base):
         expected_calls = ['setUp', 'clean-up']
         expected_results = [('addError', RuntimeError)]
@@ -109,7 +108,6 @@ def make_integration_tests():
         ]
 
     tests = [
-        X.Success,
         X.ErrorInSetup,
         X.ErrorInTest,
         X.ErrorInTearDown,
@@ -578,7 +576,7 @@ class TestAsynchronousDeferredRunTest(TestCase):
             result._events,
             Equals([
                 ('startTest', test),
-                ('addSuccess', test),
+                ('addSuccess', test, {'twisted-log': text_content('')}),
                 ('stopTest', test)]))
 
     def test_log_in_details(self):