[refactor] adjust Vue node fixtures to not be coupled to Litegraph (#6033)

## Summary

Changes the Vue node test fixture to not rely on Litegraph internal
objects (which should eventually be fully decoupled from Vue nodes) and
instead interact with nodes using black-box approach that emulates user
actions (preferred appraoch for e2e tests).

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6033-refactor-adjust-Vue-node-fixtures-to-not-be-coupled-to-Litegraph-28a6d73d3650817b8152d27dc4fe0017)
by [Unito](https://www.unito.io)

browser_tests/fixtures/VueNodeHelpers.ts

@@ -3,6 +3,8 @@
  */
 import type { Locator, Page } from '@playwright/test'
 
+import { VueNodeFixture } from './utils/vueNodeFixtures'
+
 export class VueNodeHelpers {
   constructor(private page: Page) {}
 
@@ -106,6 +108,24 @@ export class VueNodeHelpers {
     await this.page.keyboard.press('Backspace')
   }
 
+  /**
+   * Return a DOM-focused VueNodeFixture for the first node matching the title.
+   * Resolves the node id up front so subsequent interactions survive title changes.
+   */
+  async getFixtureByTitle(title: string): Promise<VueNodeFixture> {
+    const node = this.getNodeByTitle(title).first()
+    await node.waitFor({ state: 'visible' })
+
+    const nodeId = await node.evaluate((el) => el.getAttribute('data-node-id'))
+    if (!nodeId) {
+      throw new Error(
+        `Vue node titled "${title}" is missing its data-node-id attribute`
+      )
+    }
+
+    return new VueNodeFixture(this.getNodeLocator(nodeId))
+  }
+
   /**
    * Wait for Vue nodes to be rendered
    */

browser_tests/fixtures/utils/vueNodeFixtures.ts

@@ -1,131 +1,66 @@
-import type { Locator, Page } from '@playwright/test'
+import { expect } from '@playwright/test'
+import type { Locator } from '@playwright/test'
 
-import type { NodeReference } from './litegraphUtils'
-
-/**
- * VueNodeFixture provides Vue-specific testing utilities for interacting with
- * Vue node components. It bridges the gap between litegraph node references
- * and Vue UI components.
- */
+/** DOM-centric helper for a single Vue-rendered node on the canvas. */
 export class VueNodeFixture {
-  constructor(
-    private readonly nodeRef: NodeReference,
-    private readonly page: Page
-  ) {}
+  constructor(private readonly locator: Locator) {}
 
-  /**
-   * Get the node's header element using data-testid
-   */
-  async getHeader(): Promise<Locator> {
-    const nodeId = this.nodeRef.id
-    return this.page.locator(`[data-testid="node-header-${nodeId}"]`)
+  get header(): Locator {
+    return this.locator.locator('[data-testid^="node-header-"]')
   }
 
-  /**
-   * Get the node's title element
-   */
-  async getTitleElement(): Promise<Locator> {
-    const header = await this.getHeader()
-    return header.locator('[data-testid="node-title"]')
+  get title(): Locator {
+    return this.locator.locator('[data-testid="node-title"]')
+  }
+
+  get titleInput(): Locator {
+    return this.locator.locator('[data-testid="node-title-input"]')
+  }
+
+  get body(): Locator {
+    return this.locator.locator('[data-testid^="node-body-"]')
+  }
+
+  get collapseButton(): Locator {
+    return this.locator.locator('[data-testid="node-collapse-button"]')
+  }
+
+  get collapseIcon(): Locator {
+    return this.collapseButton.locator('i')
+  }
+
+  get root(): Locator {
+    return this.locator
   }
 
-  /**
-   * Get the current title text
-   */
   async getTitle(): Promise<string> {
-    const titleElement = await this.getTitleElement()
-    return (await titleElement.textContent()) || ''
+    return (await this.title.textContent()) ?? ''
   }
 
-  /**
-   * Set a new title by double-clicking and entering text
-   */
-  async setTitle(newTitle: string): Promise<void> {
-    const titleElement = await this.getTitleElement()
-    await titleElement.dblclick()
-
-    const input = (await this.getHeader()).locator(
-      '[data-testid="node-title-input"]'
-    )
-    await input.fill(newTitle)
+  async setTitle(value: string): Promise<void> {
+    await this.header.dblclick()
+    const input = this.titleInput
+    await expect(input).toBeVisible()
+    await input.fill(value)
     await input.press('Enter')
   }
 
-  /**
-   * Cancel title editing
-   */
   async cancelTitleEdit(): Promise<void> {
-    const titleElement = await this.getTitleElement()
-    await titleElement.dblclick()
-
-    const input = (await this.getHeader()).locator(
-      '[data-testid="node-title-input"]'
-    )
+    await this.header.dblclick()
+    const input = this.titleInput
+    await expect(input).toBeVisible()
     await input.press('Escape')
   }
 
-  /**
-   * Check if the title is currently being edited
-   */
-  async isEditingTitle(): Promise<boolean> {
-    const header = await this.getHeader()
-    const input = header.locator('[data-testid="node-title-input"]')
-    return await input.isVisible()
-  }
-
-  /**
-   * Get the collapse/expand button
-   */
-  async getCollapseButton(): Promise<Locator> {
-    const header = await this.getHeader()
-    return header.locator('[data-testid="node-collapse-button"]')
-  }
-
-  /**
-   * Toggle the node's collapsed state
-   */
   async toggleCollapse(): Promise<void> {
-    const button = await this.getCollapseButton()
-    await button.click()
+    await this.collapseButton.click()
   }
 
-  /**
-   * Get the collapse icon element
-   */
-  async getCollapseIcon(): Promise<Locator> {
-    const button = await this.getCollapseButton()
-    return button.locator('i')
-  }
-
-  /**
-   * Get the collapse icon's CSS classes
-   */
   async getCollapseIconClass(): Promise<string> {
-    const icon = await this.getCollapseIcon()
-    return (await icon.getAttribute('class')) || ''
+    return (await this.collapseIcon.getAttribute('class')) ?? ''
   }
 
-  /**
-   * Check if the collapse button is visible
-   */
-  async isCollapseButtonVisible(): Promise<boolean> {
-    const button = await this.getCollapseButton()
-    return await button.isVisible()
-  }
-
-  /**
-   * Get the node's body/content element
-   */
-  async getBody(): Promise<Locator> {
-    const nodeId = this.nodeRef.id
-    return this.page.locator(`[data-testid="node-body-${nodeId}"]`)
-  }
-
-  /**
-   * Check if the node body is visible (not collapsed)
-   */
-  async isBodyVisible(): Promise<boolean> {
-    const body = await this.getBody()
-    return await body.isVisible()
+  boundingBox(): ReturnType<Locator['boundingBox']> {
+    return this.locator.boundingBox()
   }
 }