test(playwright): additional dataset list playwright tests (#36684)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

superset-frontend/playwright/components/core/Textarea.ts

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+/**
+ * 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 { Locator, Page } from '@playwright/test';
+
+/**
+ * Playwright helper for interacting with HTML {@link HTMLTextAreaElement | `<textarea>`} elements.
+ *
+ * This component wraps a Playwright {@link Locator} and provides convenience methods for
+ * filling, clearing, and reading the value of a textarea without having to work with
+ * locators directly.
+ *
+ * Typical usage:
+ * ```ts
+ * const textarea = new Textarea(page, 'textarea[name="description"]');
+ * await textarea.fill('Some multi-line text');
+ * const value = await textarea.getValue();
+ * ```
+ *
+ * You can also construct an instance from the `name` attribute:
+ * ```ts
+ * const textarea = Textarea.fromName(page, 'description');
+ * await textarea.clear();
+ * ```
+ */
+export class Textarea {
+  readonly page: Page;
+  private readonly locator: Locator;
+
+  constructor(page: Page, selector: string);
+  constructor(page: Page, locator: Locator);
+  constructor(page: Page, selectorOrLocator: string | Locator) {
+    this.page = page;
+    if (typeof selectorOrLocator === 'string') {
+      this.locator = page.locator(selectorOrLocator);
+    } else {
+      this.locator = selectorOrLocator;
+    }
+  }
+
+  /**
+   * Creates a Textarea from a name attribute
+   * @param page - The Playwright page
+   * @param name - The name attribute value
+   */
+  static fromName(page: Page, name: string): Textarea {
+    const locator = page.locator(`textarea[name="${name}"]`);
+    return new Textarea(page, locator);
+  }
+
+  /**
+   * Gets the textarea element locator
+   */
+  get element(): Locator {
+    return this.locator;
+  }
+
+  /**
+   * Fills the textarea with text (clears existing content)
+   * @param text - The text to fill
+   */
+  async fill(text: string): Promise<void> {
+    await this.locator.fill(text);
+  }
+
+  /**
+   * Clears the textarea content
+   */
+  async clear(): Promise<void> {
+    await this.locator.clear();
+  }
+
+  /**
+   * Gets the current value of the textarea
+   */
+  async getValue(): Promise<string> {
+    return this.locator.inputValue();
+  }
+
+  /**
+   * Checks if the textarea is visible
+   */
+  async isVisible(): Promise<boolean> {
+    return this.locator.isVisible();
+  }
+
+  /**
+   * Checks if the textarea is enabled
+   */
+  async isEnabled(): Promise<boolean> {
+    return this.locator.isEnabled();
+  }
+}