ad-m commented on a change in pull request #8550:
URL: https://github.com/apache/airflow/pull/8550#discussion_r474665132



##########
File path: tests/providers/google/cloud/operators/test_dataflow_system.py
##########
@@ -26,4 +37,191 @@
 class CloudDataflowExampleDagsSystemTest(GoogleSystemTest):
     @provide_gcp_context(GCP_DATAFLOW_KEY)
     def test_run_example_dag_function(self):
-        self.run_dag('example_gcp_dataflow', CLOUD_DAG_FOLDER)
+        self.run_dag("example_gcp_dataflow", CLOUD_DAG_FOLDER)
+
+
+GCP_PROJECT_ID = os.environ.get("GCP_PROJECT_ID", "example-project")
+GCR_FLEX_TEMPLATE_IMAGE = 
f"gcr.io/{GCP_PROJECT_ID}/samples-dataflow-streaming-beam-sql:latest"
+
+# 
https://github.com/GoogleCloudPlatform/java-docs-samples/tree/954553c/dataflow/flex-templates/streaming_beam_sql
+GCS_TEMPLATE_PARTS = urlparse(GCS_FLEX_TEMPLATE_TEMPLATE_PATH)
+GCS_FLEX_TEMPLATE_BUCKET_NAME = GCS_TEMPLATE_PARTS.netloc
+
+
+EXAMPLE_FLEX_TEMPLATE_REPO = "GoogleCloudPlatform/java-docs-samples"
+EXAMPLE_FLEX_TEMPLATE_COMMIT = "deb0745be1d1ac1d133e1f0a7faa9413dbfbe5fe"
+EXAMPLE_FLEX_TEMPLATE_SUBDIR = "dataflow/flex-templates/streaming_beam_sql"
+
+
[email protected]("mysql", "postgres")
[email protected]_file(GCP_GCS_TRANSFER_KEY)
+class CloudDataflowExampleDagFlexTemplateJavagSystemTest(GoogleSystemTest):
+    @provide_gcp_context(GCP_GCS_TRANSFER_KEY, 
project_id=GoogleSystemTest._project_id())
+    def setUp(self) -> None:
+        # Create a Cloud Storage bucket
+        self.execute_cmd(["gsutil", "mb", 
f"gs://{GCS_FLEX_TEMPLATE_BUCKET_NAME}"])
+
+        # Build image with pipeline
+        with NamedTemporaryFile() as f:
+            f.write(
+                textwrap.dedent(
+                    """\
+                    steps:

Review comment:
       Have you considered use standard `dict` and use `json.dumps` to generate 
file content? You don't use any YAML specific syntax and JSON is subset of 
YAML. I believe that `dict` is easier to maintain long term than a hard-coded 
text block.




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