diff --git a/google/cloud/dataflow_v1beta3/services/flex_templates_service/async_client.py b/google/cloud/dataflow_v1beta3/services/flex_templates_service/async_client.py
index 74224fa..797ca9e 100644
--- a/google/cloud/dataflow_v1beta3/services/flex_templates_service/async_client.py
+++ b/google/cloud/dataflow_v1beta3/services/flex_templates_service/async_client.py
@@ -298,7 +298,7 @@ async def sample_launch_flex_template():
         # Done; return the response.
         return response
 
-    async def __aenter__(self):
+    async def __aenter__(self) -> "FlexTemplatesServiceAsyncClient":
         return self
 
     async def __aexit__(self, exc_type, exc, tb):
diff --git a/google/cloud/dataflow_v1beta3/services/jobs_v1_beta3/async_client.py b/google/cloud/dataflow_v1beta3/services/jobs_v1_beta3/async_client.py
index fb34239..189467b 100644
--- a/google/cloud/dataflow_v1beta3/services/jobs_v1_beta3/async_client.py
+++ b/google/cloud/dataflow_v1beta3/services/jobs_v1_beta3/async_client.py
@@ -853,7 +853,7 @@ async def sample_snapshot_job():
         # Done; return the response.
         return response
 
-    async def __aenter__(self):
+    async def __aenter__(self) -> "JobsV1Beta3AsyncClient":
         return self
 
     async def __aexit__(self, exc_type, exc, tb):
diff --git a/google/cloud/dataflow_v1beta3/services/messages_v1_beta3/async_client.py b/google/cloud/dataflow_v1beta3/services/messages_v1_beta3/async_client.py
index bd23378..70ae4c3 100644
--- a/google/cloud/dataflow_v1beta3/services/messages_v1_beta3/async_client.py
+++ b/google/cloud/dataflow_v1beta3/services/messages_v1_beta3/async_client.py
@@ -323,7 +323,7 @@ async def sample_list_job_messages():
         # Done; return the response.
         return response
 
-    async def __aenter__(self):
+    async def __aenter__(self) -> "MessagesV1Beta3AsyncClient":
         return self
 
     async def __aexit__(self, exc_type, exc, tb):
diff --git a/google/cloud/dataflow_v1beta3/services/metrics_v1_beta3/async_client.py b/google/cloud/dataflow_v1beta3/services/metrics_v1_beta3/async_client.py
index eeed2a9..32f00fe 100644
--- a/google/cloud/dataflow_v1beta3/services/metrics_v1_beta3/async_client.py
+++ b/google/cloud/dataflow_v1beta3/services/metrics_v1_beta3/async_client.py
@@ -521,7 +521,7 @@ async def sample_get_stage_execution_details():
         # Done; return the response.
         return response
 
-    async def __aenter__(self):
+    async def __aenter__(self) -> "MetricsV1Beta3AsyncClient":
         return self
 
     async def __aexit__(self, exc_type, exc, tb):
diff --git a/google/cloud/dataflow_v1beta3/services/snapshots_v1_beta3/async_client.py b/google/cloud/dataflow_v1beta3/services/snapshots_v1_beta3/async_client.py
index 498eabc..350a363 100644
--- a/google/cloud/dataflow_v1beta3/services/snapshots_v1_beta3/async_client.py
+++ b/google/cloud/dataflow_v1beta3/services/snapshots_v1_beta3/async_client.py
@@ -463,7 +463,7 @@ async def sample_list_snapshots():
         # Done; return the response.
         return response
 
-    async def __aenter__(self):
+    async def __aenter__(self) -> "SnapshotsV1Beta3AsyncClient":
         return self
 
     async def __aexit__(self, exc_type, exc, tb):
diff --git a/google/cloud/dataflow_v1beta3/services/templates_service/async_client.py b/google/cloud/dataflow_v1beta3/services/templates_service/async_client.py
index 6cd655a..af3f12f 100644
--- a/google/cloud/dataflow_v1beta3/services/templates_service/async_client.py
+++ b/google/cloud/dataflow_v1beta3/services/templates_service/async_client.py
@@ -470,7 +470,7 @@ async def sample_get_template():
         # Done; return the response.
         return response
 
-    async def __aenter__(self):
+    async def __aenter__(self) -> "TemplatesServiceAsyncClient":
         return self
 
     async def __aexit__(self, exc_type, exc, tb):
diff --git a/samples/generated_samples/snippet_metadata_google.dataflow.v1beta3.json b/samples/generated_samples/snippet_metadata_google.dataflow.v1beta3.json
index a540dc4..07ae5fa 100644
--- a/samples/generated_samples/snippet_metadata_google.dataflow.v1beta3.json
+++ b/samples/generated_samples/snippet_metadata_google.dataflow.v1beta3.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-dataflow-client",
-    "version": "0.8.3"
+    "version": "0.1.0"
   },
   "snippets": [
     {
diff --git a/tests/unit/gapic/dataflow_v1beta3/test_jobs_v1_beta3.py b/tests/unit/gapic/dataflow_v1beta3/test_jobs_v1_beta3.py
index 26fb514..7aa903d 100644
--- a/tests/unit/gapic/dataflow_v1beta3/test_jobs_v1_beta3.py
+++ b/tests/unit/gapic/dataflow_v1beta3/test_jobs_v1_beta3.py
@@ -1635,9 +1635,11 @@ async def test_list_jobs_async_pages():
             RuntimeError,
         )
         pages = []
-        async for page_ in (
+        # Workaround issue in python 3.9 related to code coverage by adding `# pragma: no branch`
+        # See https://github.com/googleapis/gapic-generator-python/pull/1174#issuecomment-1025132372
+        async for page_ in (  # pragma: no branch
             await client.list_jobs(request={})
-        ).pages:  # pragma: no branch
+        ).pages:
             pages.append(page_)
         for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
             assert page_.raw_page.next_page_token == token
@@ -1991,9 +1993,11 @@ async def test_aggregated_list_jobs_async_pages():
             RuntimeError,
         )
         pages = []
-        async for page_ in (
+        # Workaround issue in python 3.9 related to code coverage by adding `# pragma: no branch`
+        # See https://github.com/googleapis/gapic-generator-python/pull/1174#issuecomment-1025132372
+        async for page_ in (  # pragma: no branch
             await client.aggregated_list_jobs(request={})
-        ).pages:  # pragma: no branch
+        ).pages:
             pages.append(page_)
         for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
             assert page_.raw_page.next_page_token == token
diff --git a/tests/unit/gapic/dataflow_v1beta3/test_messages_v1_beta3.py b/tests/unit/gapic/dataflow_v1beta3/test_messages_v1_beta3.py
index 94082a0..5473db6 100644
--- a/tests/unit/gapic/dataflow_v1beta3/test_messages_v1_beta3.py
+++ b/tests/unit/gapic/dataflow_v1beta3/test_messages_v1_beta3.py
@@ -1090,9 +1090,11 @@ async def test_list_job_messages_async_pages():
             RuntimeError,
         )
         pages = []
-        async for page_ in (
+        # Workaround issue in python 3.9 related to code coverage by adding `# pragma: no branch`
+        # See https://github.com/googleapis/gapic-generator-python/pull/1174#issuecomment-1025132372
+        async for page_ in (  # pragma: no branch
             await client.list_job_messages(request={})
-        ).pages:  # pragma: no branch
+        ).pages:
             pages.append(page_)
         for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
             assert page_.raw_page.next_page_token == token
diff --git a/tests/unit/gapic/dataflow_v1beta3/test_metrics_v1_beta3.py b/tests/unit/gapic/dataflow_v1beta3/test_metrics_v1_beta3.py
index 11345e5..a8b886c 100644
--- a/tests/unit/gapic/dataflow_v1beta3/test_metrics_v1_beta3.py
+++ b/tests/unit/gapic/dataflow_v1beta3/test_metrics_v1_beta3.py
@@ -1214,9 +1214,11 @@ async def test_get_job_execution_details_async_pages():
             RuntimeError,
         )
         pages = []
-        async for page_ in (
+        # Workaround issue in python 3.9 related to code coverage by adding `# pragma: no branch`
+        # See https://github.com/googleapis/gapic-generator-python/pull/1174#issuecomment-1025132372
+        async for page_ in (  # pragma: no branch
             await client.get_job_execution_details(request={})
-        ).pages:  # pragma: no branch
+        ).pages:
             pages.append(page_)
         for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
             assert page_.raw_page.next_page_token == token
@@ -1584,9 +1586,11 @@ async def test_get_stage_execution_details_async_pages():
             RuntimeError,
         )
         pages = []
-        async for page_ in (
+        # Workaround issue in python 3.9 related to code coverage by adding `# pragma: no branch`
+        # See https://github.com/googleapis/gapic-generator-python/pull/1174#issuecomment-1025132372
+        async for page_ in (  # pragma: no branch
             await client.get_stage_execution_details(request={})
-        ).pages:  # pragma: no branch
+        ).pages:
             pages.append(page_)
         for page_, token in zip(pages, ["abc", "def", "ghi", ""]):
             assert page_.raw_page.next_page_token == token