test(boardwalk): cover the build id, the reload banner and the chunk reload guard (quick-261028-rqb)

admin/tests/app/runtime.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { DEFAULT_BASE, readBase, runtime } from '../../src/app/runtime'
+import { DEFAULT_BASE, readBase, readBuild, runtime } from '../../src/app/runtime'
 
 function docWith(content: string | null): Document {
   const doc = document.implementation.createHTMLDocument('test')
@@ -39,3 +39,36 @@ describe('runtime base', () => {
     expect(DEFAULT_BASE).toBe('/backend')
   })
 })
+
+function docWithBuild(content: string | null): Document {
+  const doc = document.implementation.createHTMLDocument('test')
+  if (content !== null) {
+    const meta = doc.createElement('meta')
+    meta.setAttribute('name', 'summer-admin-build')
+    meta.setAttribute('content', content)
+    doc.head.appendChild(meta)
+  }
+  return doc
+}
+
+describe('runtime build', () => {
+  it('reads a hex build id from the served meta', () => {
+    expect(readBuild(docWithBuild('0123456789ab'))).toBe('0123456789ab')
+    expect(readBuild(docWithBuild(' 0123456789ab '))).toBe('0123456789ab')
+  })
+
+  it.each([
+    ['a missing meta', null],
+    ['an empty value', ''],
+    ['the unreplaced build token', '__SUMMER_ADMIN_BUILD__'],
+    ['uppercase hex', '0123456789AB'],
+    ['a value with markup', '<b>0123456789ab</b>'],
+    ['a 65-character hex value', 'a'.repeat(65)],
+  ])('is empty for %s', (_label, content) => {
+    expect(readBuild(docWithBuild(content))).toBe('')
+  })
+
+  it('is empty in the test document, which carries no build', () => {
+    expect(runtime.build).toBe('')
+  })
+})