Add Axe accessibility E2E tests (#2)

Reviewed-on: #2

e2e/models/ThreadPage.ts

@@ -0,0 +1,17 @@
+import type { Locator, Page } from '@playwright/test'
+import { Base } from './Base'
+
+export class ThreadPage extends Base {
+  readonly headingLocator: Locator
+  readonly selectedPostLabelLocator: Locator
+
+  constructor(page: Page) {
+    super(page)
+    this.headingLocator = page.getByRole('heading', { name: '会話' })
+    this.selectedPostLabelLocator = page.getByText('表示中の投稿')
+  }
+
+  async goTo(handle: string, tweetId: string) {
+    await this.navigateTo(`/${handle}/status/${tweetId}`)
+  }
+}