sadpandajoe commented on code in PR #40817:
URL: https://github.com/apache/superset/pull/40817#discussion_r3383807973


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superset-frontend/playwright/tests/chart/handlebars-format-date.spec.ts:
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@@ -0,0 +1,90 @@
+/**
+ * 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.
+ */
+
+/**
+ * Regression for #32960: the `formatDate` Handlebars helper renders a real
+ * formatted date instead of a "... is not a function" helper error. CI green
+ * closes #32960; CI red means the fix is still needed in the Handlebars plugin
+ * (superset-frontend/plugins/plugin-chart-handlebars).
+ */
+import { testWithAssets, expect } from '../../helpers/fixtures';
+import { apiPost } from '../../helpers/api/requests';
+import { getDatasetByName } from '../../helpers/api/dataset';
+import { TIMEOUT } from '../../utils/constants';
+
+const DATASET_NAME = 'birth_names';
+
+testWithAssets(
+  'Handlebars formatDate helper renders a formatted date (#32960)',
+  async ({ page, testAssets }) => {
+    testWithAssets.setTimeout(TIMEOUT.SLOW_TEST);
+
+    const dataset = await getDatasetByName(page, DATASET_NAME);
+    if (!dataset) {
+      throw new Error(`Dataset ${DATASET_NAME} not found`);
+    }
+    const datasetId = dataset.id;
+
+    const params = {
+      datasource: `${datasetId}__table`,
+      viz_type: 'handlebars',
+      query_mode: 'aggregate',
+      groupby: ['ds'],
+      metrics: ['count'],
+      adhoc_filters: [],
+      row_limit: 5,
+      handlebarsTemplate:
+        "<ul class='data-list'>{{#each data}}" +
+        "<li class='hb-item'>{{formatDate 'DD.MM.YYYY' ds}}</li>" +
+        '{{/each}}</ul>',
+      styleTemplate: '',
+    };
+
+    const chartResp = await apiPost(page, 'api/v1/chart/', {
+      slice_name: `handlebars_format_date_${Date.now()}`,
+      viz_type: 'handlebars',
+      datasource_id: datasetId,
+      datasource_type: 'table',
+      params: JSON.stringify(params),
+    });
+    expect(chartResp.ok()).toBe(true);
+    const chartId: number = (await chartResp.json()).id;
+    testAssets.trackChart(chartId);
+
+    await page.goto(`explore/?slice_id=${chartId}`);
+    await page.waitForSelector('[data-test="datasource-control"]', {
+      timeout: 30_000,
+    });

Review Comment:
   Nit: I think it's ok to not have an explore page object right now as we 
aren't doing too much with it, but we should probably not hardcode the timeout 
and instead set a timeout variable. Maybe the page load one?



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