fix #991 audit asyncpg instrumentation with nooptracerprovider (#3144)

Author: cuichenli

instrumentation/opentelemetry-instrumentation-asyncpg/tests/test_asyncpg_wrapper.py

@@ -5,6 +5,7 @@
 from asyncpg import Connection, Record, cursor
 from wrapt import ObjectProxy
 
+from opentelemetry import trace as trace_api
 from opentelemetry.instrumentation.asyncpg import AsyncPGInstrumentor
 from opentelemetry.test.test_base import TestBase
 
@@ -105,3 +106,36 @@ async def exec_mock(*args, **kwargs):
         spans = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(spans), 2)
         self.assertEqual([span.status.is_ok for span in spans], [True, True])
+
+    def test_no_op_tracer_provider(self):
+        AsyncPGInstrumentor().uninstrument()
+        AsyncPGInstrumentor().instrument(
+            tracer_provider=trace_api.NoOpTracerProvider()
+        )
+
+        # Mock out all interaction with postgres
+        async def bind_mock(*args, **kwargs):
+            return []
+
+        async def exec_mock(*args, **kwargs):
+            return [], None, True
+
+        conn = mock.Mock()
+        conn.is_closed = lambda: False
+
+        conn._protocol = mock.Mock()
+        conn._protocol.bind = bind_mock
+        conn._protocol.execute = exec_mock
+        conn._protocol.bind_execute = exec_mock
+        conn._protocol.close_portal = bind_mock
+
+        state = mock.Mock()
+        state.closed = False
+
+        # init the cursor and fetch a single record
+        crs = cursor.Cursor(conn, "SELECT * FROM test", state, [], Record)
+        asyncio.run(crs._init(1))
+        asyncio.run(crs.fetch(1))
+
+        spans = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(spans), 0)