test(mobile): structurally guard quick-command action mount

mobile/src/session/quick-commands-tab-stability-source.test.ts

@@ -1,11 +1,34 @@
 import { readFileSync } from 'node:fs'
+import ts from 'typescript'
 import { describe, expect, it } from 'vitest'
 
-const source = readFileSync(
-  new URL('../../app/h/[hostId]/session/[worktreeId].tsx', import.meta.url),
-  'utf8'
+const fileUrl = new URL('../../app/h/[hostId]/session/[worktreeId].tsx', import.meta.url)
+const source = readFileSync(fileUrl, 'utf8')
+const sourceFile = ts.createSourceFile(
+  fileUrl.href,
+  source,
+  ts.ScriptTarget.Latest,
+  true,
+  ts.ScriptKind.TSX
 )
 
+function findQuickCommandsTabButtons(): ts.JsxSelfClosingElement[] {
+  const matches: ts.JsxSelfClosingElement[] = []
+
+  function visit(node: ts.Node): void {
+    if (
+      ts.isJsxSelfClosingElement(node) &&
+      node.tagName.getText(sourceFile) === 'QuickCommandsTabButton'
+    ) {
+      matches.push(node)
+    }
+    ts.forEachChild(node, visit)
+  }
+
+  visit(sourceFile)
+  return matches
+}
+
 function getQuickCommandsTabSource(): string {
   const start = source.indexOf('accessibilityLabel="New tab"')
   expect(start).toBeGreaterThanOrEqual(0)
@@ -17,9 +40,20 @@ function getQuickCommandsTabSource(): string {
 describe('quick-commands tab stability', () => {
   it('keeps the button mounted while preserving the capability gate', () => {
     const tabSource = getQuickCommandsTabSource()
+    const buttons = findQuickCommandsTabButtons()
 
-    expect(tabSource).toContain('<QuickCommandsTabButton')
-    expect(tabSource).not.toContain('{quickCommandsSupported === true ?')
+    expect(buttons).toHaveLength(1)
+    const tabBar = buttons[0].parent
+    expect(ts.isJsxElement(tabBar)).toBe(true)
+    if (!ts.isJsxElement(tabBar)) {
+      return
+    }
+    expect(tabBar.openingElement.tagName.getText(sourceFile)).toBe('View')
+    const style = tabBar.openingElement.attributes.properties.find(
+      (attribute): attribute is ts.JsxAttribute =>
+        ts.isJsxAttribute(attribute) && attribute.name.getText(sourceFile) === 'style'
+    )
+    expect(style?.initializer?.getText(sourceFile)).toBe('{styles.tabBar}')
     expect(tabSource).toContain('if (quickCommandsSupported === true)')
     expect(tabSource).toContain('setShowQuickCommands(true)')
     expect(tabSource).toContain('Desktop update required for quick commands')