Make more robust workflow tests (#1716)

tests/tests_integration/test_api/test_workflows.py

@@ -184,10 +184,12 @@ def add_multiply_workflow(
             ],
         ),
     )
-    # Delete existing workflow and versions
-    cognite_client.workflows.delete(workflow_id, ignore_unknown_ids=True)
-    yield cognite_client.workflows.versions.upsert(version)
-    cognite_client.workflows.delete(workflow_id, ignore_unknown_ids=True)
+
+    retrieved = cognite_client.workflows.versions.retrieve(version.workflow_external_id, version.version)
+    if retrieved is not None:
+        return retrieved
+    else:
+        return cognite_client.workflows.versions.upsert(version)
 
 
 @pytest.fixture(scope="session")
@@ -360,6 +362,7 @@ def test_list_workflow_executions(
     ) -> None:
         workflow_ids = set(w.as_workflow_id() for w in workflow_execution_list)
 
+        assert workflow_ids, "There should be at least one workflow execution to test list with"
         listed = cognite_client.workflows.executions.list(
             workflow_version_ids=list(workflow_ids), limit=len(workflow_execution_list)
         )
@@ -372,6 +375,7 @@ def test_retrieve_workflow_execution_detailed(
         cognite_client: CogniteClient,
         workflow_execution_list: WorkflowExecutionList,
     ) -> None:
+        assert workflow_execution_list, "There should be at least one workflow execution to test retrieve detailed with"
         retrieved = cognite_client.workflows.executions.retrieve_detailed(workflow_execution_list[0].id)
 
         assert retrieved.as_execution().dump() == workflow_execution_list[0].dump()