diff --git a/tempest/cmd/subunit_describe_calls.py b/tempest/cmd/subunit_describe_calls.py
index 0f868a9..8ee3055 100644
--- a/tempest/cmd/subunit_describe_calls.py
+++ b/tempest/cmd/subunit_describe_calls.py
@@ -294,7 +294,8 @@
             outfile.write(json.dumps(url_parser.test_logs))
         return
 
-    for test_name, items in url_parser.test_logs.iteritems():
+    for test_name in url_parser.test_logs:
+        items = url_parser.test_logs[test_name]
         sys.stdout.write('{0}\n'.format(test_name))
         if not items:
             sys.stdout.write('\n')
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index 9c33b71..b72dae9 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -43,16 +43,13 @@
         return self.create_volume(name=vol_name, imageRef=img_uuid)
 
     def _get_bdm(self, source_id, source_type, delete_on_termination=False):
-        # NOTE(gfidente): the syntax for block_device_mapping is
-        # dev_name=id:type:size:delete_on_terminate
-        # where type needs to be "snap" if the server is booted
-        # from a snapshot, size instead can be safely left empty
-
-        bd_map = [{
-            'device_name': 'vda',
-            '{}_id'.format(source_type): source_id,
-            'delete_on_termination': str(int(delete_on_termination))}]
-        return {'block_device_mapping': bd_map}
+        bd_map_v2 = [{
+            'uuid': source_id,
+            'source_type': source_type,
+            'destination_type': 'volume',
+            'boot_index': 0,
+            'delete_on_termination': delete_on_termination}]
+        return {'block_device_mapping_v2': bd_map_v2}
 
     def _boot_instance_from_resource(self, source_id,
                                      source_type,
@@ -236,14 +233,3 @@
 
         # delete instance
         self._delete_server(instance)
-
-
-class TestVolumeBootPatternV2(TestVolumeBootPattern):
-    def _get_bdm(self, source_id, source_type, delete_on_termination=False):
-        bd_map_v2 = [{
-            'uuid': source_id,
-            'source_type': source_type,
-            'destination_type': 'volume',
-            'boot_index': 0,
-            'delete_on_termination': delete_on_termination}]
-        return {'block_device_mapping_v2': bd_map_v2}
diff --git a/tempest/tests/cmd/test_subunit_describe_calls.py b/tempest/tests/cmd/test_subunit_describe_calls.py
index 1c24c37..5f3d770 100644
--- a/tempest/tests/cmd/test_subunit_describe_calls.py
+++ b/tempest/tests/cmd/test_subunit_describe_calls.py
@@ -33,6 +33,16 @@
         p.communicate()
         self.assertEqual(0, p.returncode)
 
+    def test_return_code_no_output(self):
+        subunit_file = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)),
+            'sample_streams/calls.subunit')
+        p = subprocess.Popen([
+            'subunit-describe-calls', '-s', subunit_file],
+            stdin=subprocess.PIPE)
+        p.communicate()
+        self.assertEqual(0, p.returncode)
+
     def test_parse(self):
         subunit_file = os.path.join(
             os.path.dirname(os.path.abspath(__file__)),