move tracing sdk setup from setUpClass to setUp (#2819)

* move tracing sdk setup from setUpClass to setUp

* Update contrib SHA

Author: srikanthccv

.github/workflows/test.yml

@@ -10,7 +10,7 @@ env:
   # Otherwise, set variable to the commit of your branch on
   # opentelemetry-python-contrib which is compatible with these Core repo
   # changes.
-  CONTRIB_REPO_SHA: 42ff80bef8a03ff214a54323a2631da06e6dc5e4
+  CONTRIB_REPO_SHA: c37a77e2efa9b67d4b017a3aa6d5e5f0bc5433c9
   # This is needed because we do not clone the core repo in contrib builds anymore.
   # When running contrib builds as part of core builds, we use actions/checkout@v2 which
   # does not set an environment variable (simply just runs tox), which is different when

tests/opentelemetry-test-utils/src/opentelemetry/test/test_base.py

@@ -34,22 +34,15 @@
 class TestBase(unittest.TestCase):
     # pylint: disable=C0103
 
-    @classmethod
-    def setUpClass(cls):
-        result = cls.create_tracer_provider()
-        cls.tracer_provider, cls.memory_exporter = result
-        # This is done because set_tracer_provider cannot override the
-        # current tracer provider.
-        reset_trace_globals()
-        trace_api.set_tracer_provider(cls.tracer_provider)
-
-    @classmethod
-    def tearDownClass(cls):
+    def setUp(self):
+        super().setUp()
+        result = self.create_tracer_provider()
+        self.tracer_provider, self.memory_exporter = result
         # This is done because set_tracer_provider cannot override the
         # current tracer provider.
         reset_trace_globals()
+        trace_api.set_tracer_provider(self.tracer_provider)
 
-    def setUp(self):
         self.memory_exporter.clear()
         # This is done because set_meter_provider cannot override the
         # current meter provider.
@@ -60,6 +53,11 @@ def setUp(self):
         ) = self.create_meter_provider()
         metrics_api.set_meter_provider(self.meter_provider)
 
+    def tearDown(self):
+        super().tearDown()
+        reset_trace_globals()
+        reset_metrics_globals()
+
     def get_finished_spans(self):
         return FinishedTestSpans(
             self, self.memory_exporter.get_finished_spans()