feat(simulation): add literal screen text matching (#36085)

packages/simulation/src/frontend/actions.ts

@@ -104,6 +104,10 @@ export function state(harness: Harness) {
   }
 }
 
+export function matches(harness: Pick<Harness, "screen">, text: string) {
+  return harness.screen().includes(text)
+}
+
 export async function screenshot(harness: Harness, name?: string) {
   await harness.renderOnce()
   const image = SimulationPng.screenshot(harness.renderer)

packages/simulation/src/frontend/server.ts

@@ -21,6 +21,8 @@ async function handle(
     case "ui.state": {
       return SimulationActions.state(harness)
     }
+    case "ui.matches":
+      return SimulationActions.matches(harness, request.params.text)
     case "ui.recording.finish":
       if (!finishRecording) throw new Error("UI recording is not available")
       return finishRecording()