Add test for asgi using NoOpTracerProvider (open-telemetry#1367)

Author: avzis

Diff for: CHANGELOG.md

@@ -74,6 +74,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1197](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1197))
 - Add metric instumentation for flask
   ([#1186](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1186))
+- Add a test for asgi using NoOpTracerProvider
+  ([#1367](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1367))
 
 ## [1.12.0rc2-0.32b0](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.12.0rc2-0.32b0) - 2022-07-01
 

Diff for: instrumentation/opentelemetry-instrumentation-asgi/tests/test_asgi_middleware.py

@@ -300,6 +300,20 @@ def test_custom_tracer_provider_otel_asgi(self):
                 span.resource.attributes["service-test-key"], "value"
             )
 
+    def test_no_op_tracer_provider_otel_asgi(self):
+        app = otel_asgi.OpenTelemetryMiddleware(
+            simple_asgi, tracer_provider=trace_api.NoOpTracerProvider()
+        )
+        self.seed_app(app)
+        self.send_default_request()
+
+        response_start, response_body, *_ = self.get_all_output()
+        self.assertEqual(response_body["body"], b"*")
+        self.assertEqual(response_start["status"], 200)
+
+        span_list = self.memory_exporter.get_finished_spans()
+        self.assertEqual(len(span_list), 0)
+
     def test_behavior_with_scope_server_as_none(self):
         """Test that middleware is ok when server is none in scope."""