Move to kernel style SPDX license identifiers
[babeltrace.git] / tests / bindings / python / bt2 / test_trace_collection_message_iterator.py
index c50b1af071d670776c7d876956df228190e602d5..f2ddb6d03394976cd477c0510c0001d739133ec9 100644 (file)
@@ -1,20 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Copyright (C) 2019 EfficiOS Inc.
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; only version 2
-# of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
-#
 
 import unittest
 import datetime
@@ -23,38 +10,158 @@ import os
 import os.path
 
 
+_BT_TESTS_DATADIR = os.environ['BT_TESTS_DATADIR']
 _BT_CTF_TRACES_PATH = os.environ['BT_CTF_TRACES_PATH']
-_3EVENTS_INTERSECT_TRACE_PATH = os.path.join(_BT_CTF_TRACES_PATH,
-                                             'intersection',
-                                             '3eventsintersect')
+_3EVENTS_INTERSECT_TRACE_PATH = os.path.join(
+    _BT_CTF_TRACES_PATH, 'intersection', '3eventsintersect'
+)
+_NOINTERSECT_TRACE_PATH = os.path.join(
+    _BT_CTF_TRACES_PATH, 'intersection', 'nointersect'
+)
+_SEQUENCE_TRACE_PATH = os.path.join(_BT_CTF_TRACES_PATH, 'succeed', 'sequence')
+_AUTO_SOURCE_DISCOVERY_GROUPING_PATH = os.path.join(
+    _BT_TESTS_DATADIR, 'auto-source-discovery', 'grouping'
+)
+_AUTO_SOURCE_DISCOVERY_PARAMS_LOG_LEVEL_PATH = os.path.join(
+    _BT_TESTS_DATADIR, 'auto-source-discovery', 'params-log-level'
+)
 
 
-class ComponentSpecTestCase(unittest.TestCase):
-    def test_create_good_no_params(self):
-        bt2.ComponentSpec('plugin', 'compcls')
+class _SomeSource(
+    bt2._UserSourceComponent, message_iterator_class=bt2._UserMessageIterator
+):
+    pass
 
-    def test_create_good_with_params(self):
-        bt2.ComponentSpec('plugin', 'compcls', {'salut': 23})
 
-    def test_create_good_with_path_params(self):
-        spec = bt2.ComponentSpec('plugin', 'compcls', 'a path')
-        self.assertEqual(spec.params['paths'], ['a path'])
+class _SomeFilter(
+    bt2._UserFilterComponent, message_iterator_class=bt2._UserMessageIterator
+):
+    pass
 
-    def test_create_wrong_plugin_name_type(self):
-        with self.assertRaises(TypeError):
-            bt2.ComponentSpec(23, 'compcls')
 
-    def test_create_wrong_component_class_name_type(self):
-        with self.assertRaises(TypeError):
-            bt2.ComponentSpec('plugin', 190)
+class _SomeSink(bt2._UserSinkComponent):
+    def _user_consume(self):
+        pass
+
+
+class ComponentSpecTestCase(unittest.TestCase):
+    def setUp(self):
+        # A source CC from a plugin.
+        self._dmesg_cc = bt2.find_plugin('text').source_component_classes['dmesg']
+        assert self._dmesg_cc is not None
+
+        # A filter CC from a plugin.
+        self._muxer_cc = bt2.find_plugin('utils').filter_component_classes['muxer']
+        assert self._muxer_cc is not None
+
+        # A sink CC from a plugin.
+        self._pretty_cc = bt2.find_plugin('text').sink_component_classes['pretty']
+        assert self._pretty_cc is not None
+
+    def test_create_source_from_name(self):
+        spec = bt2.ComponentSpec.from_named_plugin_and_component_class('text', 'dmesg')
+        self.assertEqual(spec.component_class.name, 'dmesg')
+
+    def test_create_source_from_plugin(self):
+        spec = bt2.ComponentSpec(self._dmesg_cc)
+        self.assertEqual(spec.component_class.name, 'dmesg')
+
+    def test_create_source_from_user(self):
+        spec = bt2.ComponentSpec(_SomeSource)
+        self.assertEqual(spec.component_class.name, '_SomeSource')
+
+    def test_create_filter_from_name(self):
+        spec = bt2.ComponentSpec.from_named_plugin_and_component_class('utils', 'muxer')
+        self.assertEqual(spec.component_class.name, 'muxer')
+
+    def test_create_filter_from_object(self):
+        spec = bt2.ComponentSpec(self._muxer_cc)
+        self.assertEqual(spec.component_class.name, 'muxer')
+
+    def test_create_sink_from_name(self):
+        with self.assertRaisesRegex(
+            KeyError,
+            'source or filter component class `pretty` not found in plugin `text`',
+        ):
+            bt2.ComponentSpec.from_named_plugin_and_component_class('text', 'pretty')
+
+    def test_create_sink_from_object(self):
+        with self.assertRaisesRegex(
+            TypeError,
+            "'_SinkComponentClassConst' is not a source or filter component class",
+        ):
+            bt2.ComponentSpec(self._pretty_cc)
+
+    def test_create_from_object_with_params(self):
+        spec = bt2.ComponentSpec(self._dmesg_cc, {'salut': 23})
+        self.assertEqual(spec.params['salut'], 23)
+
+    def test_create_from_name_with_params(self):
+        spec = bt2.ComponentSpec.from_named_plugin_and_component_class(
+            'text', 'dmesg', {'salut': 23}
+        )
+        self.assertEqual(spec.params['salut'], 23)
+
+    def test_create_from_object_with_path_params(self):
+        spec = spec = bt2.ComponentSpec(self._dmesg_cc, 'a path')
+        self.assertEqual(spec.params['inputs'], ['a path'])
+
+    def test_create_from_name_with_path_params(self):
+        spec = spec = bt2.ComponentSpec.from_named_plugin_and_component_class(
+            'text', 'dmesg', 'a path'
+        )
+        self.assertEqual(spec.params['inputs'], ['a path'])
+
+    def test_create_wrong_comp_class_type(self):
+        with self.assertRaisesRegex(
+            TypeError, "'int' is not a source or filter component class"
+        ):
+            bt2.ComponentSpec(18)
+
+    def test_create_from_name_wrong_plugin_name_type(self):
+        with self.assertRaisesRegex(TypeError, "'int' is not a 'str' object"):
+            bt2.ComponentSpec.from_named_plugin_and_component_class(23, 'compcls')
+
+    def test_create_from_name_non_existent_plugin(self):
+        with self.assertRaisesRegex(
+            ValueError, "no such plugin: this_plugin_does_not_exist"
+        ):
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'this_plugin_does_not_exist', 'compcls'
+            )
+
+    def test_create_from_name_wrong_component_class_name_type(self):
+        with self.assertRaisesRegex(TypeError, "'int' is not a 'str' object"):
+            bt2.ComponentSpec.from_named_plugin_and_component_class('utils', 190)
 
     def test_create_wrong_params_type(self):
-        with self.assertRaises(TypeError):
-            bt2.ComponentSpec('dwdw', 'compcls', datetime.datetime.now())
+        with self.assertRaisesRegex(
+            TypeError, "cannot create value object from 'datetime' object"
+        ):
+            bt2.ComponentSpec(self._dmesg_cc, params=datetime.datetime.now())
+
+    def test_create_from_name_wrong_params_type(self):
+        with self.assertRaisesRegex(
+            TypeError, "cannot create value object from 'datetime' object"
+        ):
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'text', 'dmesg', datetime.datetime.now()
+            )
+
+    def test_create_wrong_log_level_type(self):
+        with self.assertRaisesRegex(TypeError, "'str' is not an 'int' object"):
+            bt2.ComponentSpec(self._dmesg_cc, logging_level='banane')
+
+    def test_create_from_name_wrong_log_level_type(self):
+        with self.assertRaisesRegex(TypeError, "'str' is not an 'int' object"):
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'text', 'dmesg', logging_level='banane'
+            )
 
 
 # Return a map, msg type -> number of messages of this type.
 
+
 def _count_msgs_by_type(msgs):
     res = {}
 
@@ -68,102 +175,539 @@ def _count_msgs_by_type(msgs):
 
 class TraceCollectionMessageIteratorTestCase(unittest.TestCase):
     def test_create_wrong_stream_intersection_mode_type(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
 
         with self.assertRaises(TypeError):
             bt2.TraceCollectionMessageIterator(specs, stream_intersection_mode=23)
 
     def test_create_wrong_begin_type(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
 
         with self.assertRaises(TypeError):
             bt2.TraceCollectionMessageIterator(specs, begin='hi')
 
     def test_create_wrong_end_type(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
 
         with self.assertRaises(TypeError):
             bt2.TraceCollectionMessageIterator(specs, begin='lel')
 
-    def test_create_no_such_plugin(self):
-        specs = [bt2.ComponentSpec('77', '101', _3EVENTS_INTERSECT_TRACE_PATH)]
-
-        with self.assertRaises(bt2.Error):
-            bt2.TraceCollectionMessageIterator(specs)
-
     def test_create_begin_s(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         bt2.TraceCollectionMessageIterator(specs, begin=19457.918232)
 
     def test_create_end_s(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         bt2.TraceCollectionMessageIterator(specs, end=123.12312)
 
     def test_create_begin_datetime(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         bt2.TraceCollectionMessageIterator(specs, begin=datetime.datetime.now())
 
     def test_create_end_datetime(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         bt2.TraceCollectionMessageIterator(specs, end=datetime.datetime.now())
 
     def test_iter_no_intersection(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         msg_iter = bt2.TraceCollectionMessageIterator(specs)
         msgs = list(msg_iter)
-        self.assertEqual(len(msgs), 32)
+        self.assertEqual(len(msgs), 28)
         hist = _count_msgs_by_type(msgs)
-        self.assertEqual(hist[bt2.message._EventMessage], 8)
+        self.assertEqual(hist[bt2._EventMessageConst], 8)
 
     # Same as the above, but we pass a single spec instead of a spec list.
     def test_iter_specs_not_list(self):
-        spec = bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)
+        spec = bt2.ComponentSpec.from_named_plugin_and_component_class(
+            'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+        )
         msg_iter = bt2.TraceCollectionMessageIterator(spec)
         msgs = list(msg_iter)
-        self.assertEqual(len(msgs), 32)
+        self.assertEqual(len(msgs), 28)
         hist = _count_msgs_by_type(msgs)
-        self.assertEqual(hist[bt2.message._EventMessage], 8)
+        self.assertEqual(hist[bt2._EventMessageConst], 8)
 
     def test_iter_custom_filter(self):
-        src_spec = bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)
-        flt_spec = bt2.ComponentSpec('utils', 'trimmer', {
-            'end': '13515309.000000075',
-        })
+        src_spec = bt2.ComponentSpec.from_named_plugin_and_component_class(
+            'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+        )
+        flt_spec = bt2.ComponentSpec.from_named_plugin_and_component_class(
+            'utils', 'trimmer', {'end': '13515309.000000075'}
+        )
         msg_iter = bt2.TraceCollectionMessageIterator(src_spec, flt_spec)
         hist = _count_msgs_by_type(msg_iter)
-        self.assertEqual(hist[bt2.message._EventMessage], 5)
+        self.assertEqual(hist[bt2._EventMessageConst], 5)
 
     def test_iter_intersection(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
-        msg_iter = bt2.TraceCollectionMessageIterator(specs, stream_intersection_mode=True)
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
+        msg_iter = bt2.TraceCollectionMessageIterator(
+            specs, stream_intersection_mode=True
+        )
         msgs = list(msg_iter)
-        self.assertEqual(len(msgs), 19)
+        self.assertEqual(len(msgs), 15)
         hist = _count_msgs_by_type(msgs)
-        self.assertEqual(hist[bt2.message._EventMessage], 3)
-
-    def test_iter_intersection_no_path_param(self):
-        specs = [bt2.ComponentSpec('text', 'dmesg', {'read-from-stdin': True})]
-
-        with self.assertRaises(bt2.Error):
-            bt2.TraceCollectionMessageIterator(specs, stream_intersection_mode=True)
+        self.assertEqual(hist[bt2._EventMessageConst], 3)
+
+    def test_iter_intersection_params(self):
+        # Check that all params used to create the source component are passed
+        # to the `babeltrace.trace-infos` query.
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf',
+                'fs',
+                {
+                    'inputs': [_3EVENTS_INTERSECT_TRACE_PATH],
+                    'clock-class-offset-s': 1000,
+                },
+            )
+        ]
+
+        msg_iter = bt2.TraceCollectionMessageIterator(
+            specs, stream_intersection_mode=True
+        )
+
+        event_msgs = [x for x in msg_iter if type(x) is bt2._EventMessageConst]
+        self.assertEqual(len(event_msgs), 3)
+        self.assertEqual(
+            event_msgs[0].default_clock_snapshot.ns_from_origin, 13516309000000071
+        )
+        self.assertEqual(
+            event_msgs[1].default_clock_snapshot.ns_from_origin, 13516309000000072
+        )
+        self.assertEqual(
+            event_msgs[2].default_clock_snapshot.ns_from_origin, 13516309000000082
+        )
 
     def test_iter_no_intersection_two_traces(self):
-        spec = bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)
+        spec = bt2.ComponentSpec.from_named_plugin_and_component_class(
+            'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+        )
         specs = [spec, spec]
         msg_iter = bt2.TraceCollectionMessageIterator(specs)
         msgs = list(msg_iter)
-        self.assertEqual(len(msgs), 64)
+        self.assertEqual(len(msgs), 56)
         hist = _count_msgs_by_type(msgs)
-        self.assertEqual(hist[bt2.message._EventMessage], 16)
+        self.assertEqual(hist[bt2._EventMessageConst], 16)
 
     def test_iter_no_intersection_begin(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         msg_iter = bt2.TraceCollectionMessageIterator(specs, begin=13515309.000000023)
         hist = _count_msgs_by_type(msg_iter)
-        self.assertEqual(hist[bt2.message._EventMessage], 6)
+        self.assertEqual(hist[bt2._EventMessageConst], 6)
 
     def test_iter_no_intersection_end(self):
-        specs = [bt2.ComponentSpec('ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH)]
+        specs = [
+            bt2.ComponentSpec.from_named_plugin_and_component_class(
+                'ctf', 'fs', _3EVENTS_INTERSECT_TRACE_PATH
+            )
+        ]
         msg_iter = bt2.TraceCollectionMessageIterator(specs, end=13515309.000000075)
         hist = _count_msgs_by_type(msg_iter)
-        self.assertEqual(hist[bt2.message._EventMessage], 5)
+        self.assertEqual(hist[bt2._EventMessageConst], 5)
+
+    def test_iter_auto_source_component_spec(self):
+        specs = [bt2.AutoSourceComponentSpec(_3EVENTS_INTERSECT_TRACE_PATH)]
+        msg_iter = bt2.TraceCollectionMessageIterator(specs)
+        msgs = list(msg_iter)
+        self.assertEqual(len(msgs), 28)
+        hist = _count_msgs_by_type(msgs)
+        self.assertEqual(hist[bt2._EventMessageConst], 8)
+
+    def test_iter_auto_source_component_spec_list_of_strings(self):
+        msg_iter = bt2.TraceCollectionMessageIterator([_3EVENTS_INTERSECT_TRACE_PATH])
+        msgs = list(msg_iter)
+        self.assertEqual(len(msgs), 28)
+        hist = _count_msgs_by_type(msgs)
+        self.assertEqual(hist[bt2._EventMessageConst], 8)
+
+    def test_iter_auto_source_component_spec_string(self):
+        msg_iter = bt2.TraceCollectionMessageIterator(_3EVENTS_INTERSECT_TRACE_PATH)
+        msgs = list(msg_iter)
+        self.assertEqual(len(msgs), 28)
+        hist = _count_msgs_by_type(msgs)
+        self.assertEqual(hist[bt2._EventMessageConst], 8)
+
+    def test_iter_mixed_inputs(self):
+        msg_iter = bt2.TraceCollectionMessageIterator(
+            [
+                _3EVENTS_INTERSECT_TRACE_PATH,
+                bt2.AutoSourceComponentSpec(_SEQUENCE_TRACE_PATH),
+                bt2.ComponentSpec.from_named_plugin_and_component_class(
+                    'ctf', 'fs', _NOINTERSECT_TRACE_PATH
+                ),
+            ]
+        )
+        msgs = list(msg_iter)
+        self.assertEqual(len(msgs), 76)
+        hist = _count_msgs_by_type(msgs)
+        self.assertEqual(hist[bt2._EventMessageConst], 24)
+
+    def test_auto_source_component_non_existent(self):
+        with self.assertRaisesRegex(
+            RuntimeError,
+            'Some auto source component specs did not produce any component',
+        ):
+            # Test with one path known to contain a trace and one path known
+            # to not contain any trace.
+            bt2.TraceCollectionMessageIterator(
+                [_SEQUENCE_TRACE_PATH, '/this/path/better/not/exist']
+            )
+
+
+class _TestAutoDiscoverSourceComponentSpecs(unittest.TestCase):
+    def setUp(self):
+        self._saved_babeltrace_plugin_path = os.environ['BABELTRACE_PLUGIN_PATH']
+        os.environ['BABELTRACE_PLUGIN_PATH'] += os.pathsep + self._plugin_path
+
+    def tearDown(self):
+        os.environ['BABELTRACE_PLUGIN_PATH'] = self._saved_babeltrace_plugin_path
+
+
+class TestAutoDiscoverSourceComponentSpecsGrouping(
+    _TestAutoDiscoverSourceComponentSpecs
+):
+    _plugin_path = _AUTO_SOURCE_DISCOVERY_GROUPING_PATH
+
+    def test_grouping(self):
+        specs = [
+            bt2.AutoSourceComponentSpec('ABCDE'),
+            bt2.AutoSourceComponentSpec(_AUTO_SOURCE_DISCOVERY_GROUPING_PATH),
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 8)
+
+        self.assertEqual(msgs[0].stream.name, 'TestSourceABCDE: ABCDE')
+        self.assertEqual(msgs[1].stream.name, 'TestSourceExt: aaa1, aaa2, aaa3')
+        self.assertEqual(msgs[2].stream.name, 'TestSourceExt: bbb1, bbb2')
+        self.assertEqual(msgs[3].stream.name, 'TestSourceExt: ccc1')
+        self.assertEqual(msgs[4].stream.name, 'TestSourceExt: ccc2')
+        self.assertEqual(msgs[5].stream.name, 'TestSourceExt: ccc3')
+        self.assertEqual(msgs[6].stream.name, 'TestSourceExt: ccc4')
+        self.assertEqual(msgs[7].stream.name, 'TestSourceSomeDir: some-dir')
+
+
+class TestAutoDiscoverSourceComponentSpecsParamsObjLogLevel(
+    _TestAutoDiscoverSourceComponentSpecs
+):
+    _plugin_path = _AUTO_SOURCE_DISCOVERY_PARAMS_LOG_LEVEL_PATH
+
+    _dir_a = os.path.join(_AUTO_SOURCE_DISCOVERY_PARAMS_LOG_LEVEL_PATH, 'dir-a')
+    _dir_b = os.path.join(_AUTO_SOURCE_DISCOVERY_PARAMS_LOG_LEVEL_PATH, 'dir-b')
+    _dir_ab = os.path.join(_AUTO_SOURCE_DISCOVERY_PARAMS_LOG_LEVEL_PATH, 'dir-ab')
+
+    def _test_two_comps_from_one_spec(self, params, obj=None, logging_level=None):
+        specs = [
+            bt2.AutoSourceComponentSpec(
+                self._dir_ab, params=params, obj=obj, logging_level=logging_level
+            )
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 2)
+
+        return msgs
+
+    def test_params_two_comps_from_one_spec(self):
+        msgs = self._test_two_comps_from_one_spec(
+            params={'test-allo': 'madame', 'what': 'test-params'}
+        )
+
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: ('test-allo', 'madame')")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: ('test-allo', 'madame')")
+
+    def test_obj_two_comps_from_one_spec(self):
+        msgs = self._test_two_comps_from_one_spec(
+            params={'what': 'python-obj'}, obj='deore'
+        )
+
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: deore")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: deore")
+
+    def test_log_level_two_comps_from_one_spec(self):
+        msgs = self._test_two_comps_from_one_spec(
+            params={'what': 'log-level'}, logging_level=bt2.LoggingLevel.DEBUG
+        )
+
+        self.assertEqual(
+            msgs[0].stream.name, "TestSourceA: {}".format(bt2.LoggingLevel.DEBUG)
+        )
+        self.assertEqual(
+            msgs[1].stream.name, "TestSourceB: {}".format(bt2.LoggingLevel.DEBUG)
+        )
+
+    def _test_two_comps_from_two_specs(
+        self,
+        params_a=None,
+        params_b=None,
+        obj_a=None,
+        obj_b=None,
+        logging_level_a=None,
+        logging_level_b=None,
+    ):
+        specs = [
+            bt2.AutoSourceComponentSpec(
+                self._dir_a, params=params_a, obj=obj_a, logging_level=logging_level_a
+            ),
+            bt2.AutoSourceComponentSpec(
+                self._dir_b, params=params_b, obj=obj_b, logging_level=logging_level_b
+            ),
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 2)
+
+        return msgs
+
+    def test_params_two_comps_from_two_specs(self):
+        msgs = self._test_two_comps_from_two_specs(
+            params_a={'test-allo': 'madame', 'what': 'test-params'},
+            params_b={'test-bonjour': 'monsieur', 'what': 'test-params'},
+        )
+
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: ('test-allo', 'madame')")
+        self.assertEqual(
+            msgs[1].stream.name, "TestSourceB: ('test-bonjour', 'monsieur')"
+        )
+
+    def test_obj_two_comps_from_two_specs(self):
+        msgs = self._test_two_comps_from_two_specs(
+            params_a={'what': 'python-obj'},
+            params_b={'what': 'python-obj'},
+            obj_a='deore',
+            obj_b='alivio',
+        )
+
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: deore")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: alivio")
+
+    def test_log_level_two_comps_from_two_specs(self):
+        msgs = self._test_two_comps_from_two_specs(
+            params_a={'what': 'log-level'},
+            params_b={'what': 'log-level'},
+            logging_level_a=bt2.LoggingLevel.DEBUG,
+            logging_level_b=bt2.LoggingLevel.TRACE,
+        )
+
+        self.assertEqual(
+            msgs[0].stream.name, "TestSourceA: {}".format(bt2.LoggingLevel.DEBUG)
+        )
+        self.assertEqual(
+            msgs[1].stream.name, "TestSourceB: {}".format(bt2.LoggingLevel.TRACE)
+        )
+
+    def _test_one_comp_from_one_spec_one_comp_from_both_1(
+        self,
+        params_a=None,
+        params_ab=None,
+        obj_a=None,
+        obj_ab=None,
+        logging_level_a=None,
+        logging_level_ab=None,
+    ):
+        specs = [
+            bt2.AutoSourceComponentSpec(
+                self._dir_a, params=params_a, obj=obj_a, logging_level=logging_level_a
+            ),
+            bt2.AutoSourceComponentSpec(
+                self._dir_ab,
+                params=params_ab,
+                obj=obj_ab,
+                logging_level=logging_level_ab,
+            ),
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 2)
+
+        return msgs
+
+    def test_params_one_comp_from_one_spec_one_comp_from_both_1(self):
+        msgs = self._test_one_comp_from_one_spec_one_comp_from_both_1(
+            params_a={'test-allo': 'madame', 'what': 'test-params'},
+            params_ab={'test-bonjour': 'monsieur', 'what': 'test-params'},
+        )
+
+        self.assertEqual(
+            msgs[0].stream.name,
+            "TestSourceA: ('test-allo', 'madame'), ('test-bonjour', 'monsieur')",
+        )
+        self.assertEqual(
+            msgs[1].stream.name, "TestSourceB: ('test-bonjour', 'monsieur')"
+        )
+
+    def test_obj_one_comp_from_one_spec_one_comp_from_both_1(self):
+        msgs = self._test_one_comp_from_one_spec_one_comp_from_both_1(
+            params_a={'what': 'python-obj'},
+            params_ab={'what': 'python-obj'},
+            obj_a='deore',
+            obj_ab='alivio',
+        )
+
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: alivio")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: alivio")
+
+    def test_log_level_one_comp_from_one_spec_one_comp_from_both_1(self):
+        msgs = self._test_one_comp_from_one_spec_one_comp_from_both_1(
+            params_a={'what': 'log-level'},
+            params_ab={'what': 'log-level'},
+            logging_level_a=bt2.LoggingLevel.DEBUG,
+            logging_level_ab=bt2.LoggingLevel.TRACE,
+        )
+
+        self.assertEqual(
+            msgs[0].stream.name, "TestSourceA: {}".format(bt2.LoggingLevel.TRACE)
+        )
+        self.assertEqual(
+            msgs[1].stream.name, "TestSourceB: {}".format(bt2.LoggingLevel.TRACE)
+        )
+
+    def _test_one_comp_from_one_spec_one_comp_from_both_2(
+        self,
+        params_ab=None,
+        params_a=None,
+        obj_ab=None,
+        obj_a=None,
+        logging_level_ab=None,
+        logging_level_a=None,
+    ):
+        specs = [
+            bt2.AutoSourceComponentSpec(
+                self._dir_ab,
+                params=params_ab,
+                obj=obj_ab,
+                logging_level=logging_level_ab,
+            ),
+            bt2.AutoSourceComponentSpec(
+                self._dir_a, params=params_a, obj=obj_a, logging_level=logging_level_a
+            ),
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 2)
+
+        return msgs
+
+    def test_params_one_comp_from_one_spec_one_comp_from_both_2(self):
+        msgs = self._test_one_comp_from_one_spec_one_comp_from_both_2(
+            params_ab={
+                'test-bonjour': 'madame',
+                'test-salut': 'les amis',
+                'what': 'test-params',
+            },
+            params_a={'test-bonjour': 'monsieur', 'what': 'test-params'},
+        )
+
+        self.assertEqual(
+            msgs[0].stream.name,
+            "TestSourceA: ('test-bonjour', 'monsieur'), ('test-salut', 'les amis')",
+        )
+        self.assertEqual(
+            msgs[1].stream.name,
+            "TestSourceB: ('test-bonjour', 'madame'), ('test-salut', 'les amis')",
+        )
+
+    def test_obj_one_comp_from_one_spec_one_comp_from_both_2(self):
+        msgs = self._test_one_comp_from_one_spec_one_comp_from_both_2(
+            params_ab={'what': 'python-obj'},
+            params_a={'what': 'python-obj'},
+            obj_ab='deore',
+            obj_a='alivio',
+        )
+
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: alivio")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: deore")
+
+    def test_log_level_one_comp_from_one_spec_one_comp_from_both_2(self):
+        msgs = self._test_one_comp_from_one_spec_one_comp_from_both_2(
+            params_ab={'what': 'log-level'},
+            params_a={'what': 'log-level'},
+            logging_level_ab=bt2.LoggingLevel.DEBUG,
+            logging_level_a=bt2.LoggingLevel.TRACE,
+        )
+
+        self.assertEqual(
+            msgs[0].stream.name, "TestSourceA: {}".format(bt2.LoggingLevel.TRACE)
+        )
+        self.assertEqual(
+            msgs[1].stream.name, "TestSourceB: {}".format(bt2.LoggingLevel.DEBUG)
+        )
+
+    def test_obj_override_with_none(self):
+        specs = [
+            bt2.AutoSourceComponentSpec(
+                self._dir_ab, params={'what': 'python-obj'}, obj='deore'
+            ),
+            bt2.AutoSourceComponentSpec(
+                self._dir_a, params={'what': 'python-obj'}, obj=None
+            ),
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 2)
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: None")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: deore")
+
+    def test_obj_no_override_with_no_obj(self):
+        specs = [
+            bt2.AutoSourceComponentSpec(
+                self._dir_ab, params={'what': 'python-obj'}, obj='deore'
+            ),
+            bt2.AutoSourceComponentSpec(self._dir_a, params={'what': 'python-obj'}),
+        ]
+        it = bt2.TraceCollectionMessageIterator(specs)
+        msgs = [x for x in it if type(x) is bt2._StreamBeginningMessageConst]
+
+        self.assertEqual(len(msgs), 2)
+        self.assertEqual(msgs[0].stream.name, "TestSourceA: deore")
+        self.assertEqual(msgs[1].stream.name, "TestSourceB: deore")
+
+
+if __name__ == '__main__':
+    unittest.main()
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