diff --git a/tox.ini b/tox.ini
index 6e64bdb..6b2f94b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -76,8 +76,13 @@ envlist =
     py3{4,5,6,7,8}-test-opentracing-shim
     pypy3-test-opentracing-shim
 
+    ; opentelemetry-opentracing-shim
+    py3{4,5,6,7,8}-test-opentracing-shim
+    pypy3-test-opentracing-shim
 
-    py3{4,5,6,7,8}-coverage
+    ; opentelemetry-opentracing-shim
+    py3{4,5,6,7,8}-test-ext-grpc
+    pypy3-test-ext-grpc
 
     ; Coverage is temporarily disabled for pypy3 due to the pytest bug.
     ; pypy3-coverage
@@ -107,6 +112,7 @@ changedir =
   test-api: opentelemetry-api/tests
   test-sdk: opentelemetry-sdk/tests
   test-auto-instrumentation: opentelemetry-auto-instrumentation/tests
+  test-ext-grpc: ext/opentelemetry-ext-grpc/tests
   test-ext-http-requests: ext/opentelemetry-ext-http-requests/tests
   test-ext-jaeger: ext/opentelemetry-ext-jaeger/tests
   test-ext-dbapi: ext/opentelemetry-ext-dbapi/tests
@@ -144,6 +150,8 @@ commands_pre =
   example-http: pip install -r {toxinidir}/docs/examples/http/requirements.txt
 
   ext: pip install {toxinidir}/opentelemetry-api
+  grpc: pip install {toxinidir}/ext/opentelemetry-ext-grpc
+  grpc: pip install {toxinidir}/opentelemetry-sdk
   wsgi,flask: pip install {toxinidir}/ext/opentelemetry-ext-testutil
   wsgi,flask: pip install {toxinidir}/ext/opentelemetry-ext-wsgi
   wsgi,flask: pip install {toxinidir}/opentelemetry-sdk