* Adding (failing) testcase to cover Issue open-telemetry#2029

Author: reiktar

instrumentation/opentelemetry-instrumentation-celery/tests/test_duplicate.py

@@ -0,0 +1,30 @@
+# Copyright The OpenTelemetry Authors
+#
+# 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 unittest
+
+from opentelemetry.instrumentation.celery import CeleryInstrumentor
+
+class TestUtils(unittest.TestCase):
+
+    def test_duplicate_instrumentaion(self):
+        first = CeleryInstrumentor()
+        first.instrument()
+        second = CeleryInstrumentor()
+        second.instrument()
+        CeleryInstrumentor().uninstrument()
+        self.assertIsNotNone(first.metrics)
+        self.assertIsNotNone(second.metrics)
+        self.assertEqual(first.task_id_to_start_time,{})
+        self.assertEqual(second.task_id_to_start_time, {})