add unit test for stream generator

Author: guzzijones

st2common/tests/unit/test_generator.py

@@ -0,0 +1,77 @@
+# Copyright 2020 The StackStorm Authors.
+# Copyright 2019 Extreme Networks, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import mock
+import unittest2
+from st2common.stream import listener
+
+
+class MockBody(object):
+
+    def __init__(self, id):
+        self.id = id
+        self.status = "succeeded"
+
+
+INCLUDE = "test"
+END_EVENT = "test_end_event"
+END_ID = "test_end_id"
+EVENTS = [(INCLUDE, MockBody("notend")), (END_EVENT, MockBody(END_ID))]
+
+
+class MockQueue():
+
+    def __init__(self):
+        self.items = EVENTS
+
+    def get(self, *args, **kwargs):
+        if len(self.items) > 0:
+            return self.items.pop(0)
+        return None
+
+    def put(self, event):
+        self.items.append(event)
+
+
+class MockListener(listener.BaseListener):
+
+    def __init__(self, *args, **kwargs):
+        super(MockListener, self).__init__(*args, **kwargs)
+
+    def get_consumers(self, consumer, channel):
+        pass
+
+
+class TestStream(unittest2.TestCase):
+
+    @mock.patch('st2common.stream.listener.BaseListener._get_action_ref_for_body')
+    @mock.patch('eventlet.Queue')
+    def test_generator(self, mock_queue,
+            get_action_ref_for_body):
+        get_action_ref_for_body.return_value = None
+        mock_queue.return_value = MockQueue()
+        mock_consumer = MockListener(connection=None)
+        mock_consumer._stopped = False
+        app_iter = mock_consumer.generator(events=INCLUDE,
+            end_event=END_EVENT,
+            end_statuses=["succeeded"],
+            end_execution_id=END_ID)
+        events = EVENTS.append('')
+        for index, val in enumerate(app_iter):
+            self.assertEquals(val, events[index])
+
+
+if __name__ == "__main__":
+    unittest2.main()