mikebridge commented on code in PR #45103:
URL: https://github.com/apache/superset/pull/45103#discussion_r4249669656


##########
superset-frontend/playwright/helpers/api/semanticLayer.ts:
##########
@@ -0,0 +1,125 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { APIResponse, Page, test } from '@playwright/test';
+import rison from 'rison';
+import { apiDelete, apiGet, apiPost, ApiRequestOptions } from './requests';
+
+/**
+ * Layer type of the in-memory provider in tests/e2e_extensions/semantic_stub.
+ * The prefix comes from the extension loader, so a stub that registered
+ * outside the extension mechanism would not match.
+ */
+export const STUB_SEMANTIC_LAYER_TYPE =
+  'extensions.superset-e2e.semantic-stub.stub';
+
+/** The stub's only view, with dimensions `category`/`region`. */
+export const STUB_VIEW_NAME = 'orders';
+
+const ENDPOINTS = {
+  SEMANTIC_LAYER: 'api/v1/semantic_layer/',
+  SEMANTIC_VIEW: 'api/v1/semantic_view/',
+  DATASOURCE: 'api/v1/datasource/',
+} as const;
+
+export interface StubSemanticView {
+  layerUuid: string;
+  viewId: number;
+  /** `<id>__semantic_view`, the form-data datasource key. */
+  datasource: string;
+}
+
+/**
+ * Stand down unless the stub provider is registered on this instance.
+ *
+ * The stub loads only under `superset_test_config_semantic`, so the required
+ * run collects and skips these specs. The dedicated CI step sets
+ * `PLAYWRIGHT_REQUIRE_SEMANTIC_STUB=true`, which turns a missing stub into a
+ * failure: a broken extension load must not pass as an empty run.
+ */
+export async function skipUnlessSemanticStub(page: Page): Promise<void> {
+  const response = await apiGet(page, `${ENDPOINTS.SEMANTIC_LAYER}types`, {
+    failOnStatusCode: false,
+  });
+  const types: Array<{ id: string }> = response.ok()
+    ? (await response.json()).result
+    : [];
+  const registered = types.some(type => type.id === STUB_SEMANTIC_LAYER_TYPE);
+  if (process.env.PLAYWRIGHT_REQUIRE_SEMANTIC_STUB?.toLowerCase() === 'true') {
+    if (!registered) {
+      throw new Error(
+        `${STUB_SEMANTIC_LAYER_TYPE} is not registered; check LOCAL_EXTENSIONS 
` +
+          'and ENABLE_EXTENSIONS in superset_test_config_semantic.',
+      );
+    }
+    return;
+  }
+  test.skip(
+    !registered,
+    'The E2E semantic stub is not loaded on this instance.',
+  );
+}
+
+/**
+ * Create a stub semantic layer and its `orders` view. Track the returned
+ * layer for cleanup; deleting a layer deletes its views.
+ */
+export async function apiCreateStubSemanticView(
+  page: Page,
+  uniqueSuffix: string,
+): Promise<StubSemanticView> {
+  const layerResp = await apiPost(page, ENDPOINTS.SEMANTIC_LAYER, {
+    name: `e2e_semantic_stub_${uniqueSuffix}`,
+    type: STUB_SEMANTIC_LAYER_TYPE,
+    configuration: {},
+  });
+  const layerUuid: string = (await layerResp.json()).result.uuid;
+
+  const viewResp = await apiPost(page, ENDPOINTS.SEMANTIC_VIEW, {

Review Comment:
   Good catch — the layer was created before either operation, and the caller 
could not track it until this helper returned. I added cleanup around view 
creation and datasource lookup, preserving the original failure if cleanup also 
fails. A red-first Jest test covered both failure paths and now passes, with a 
third case for cleanup failure.
   
   Implemented in 9cf0b7a26a. Reviewed independently by Claude Sonnet 5.5; 
implementation and reply drafted with Codex assistance.



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