Function wrapReadTextWithError

packages/agent-core/test/session/init.test.ts:757–777

* Wrap a Kaos so every `readText` (and `readLines`, which reads via * `readText` in the ACP bridge) rejects with `cause`. Used to simulate the * Zed ACP `fs/readTextFile` "Internal error" path that broke session bootstrap * before AGENTS.md loading was rerouted onto the persistence kaos.

(inner: Kaos, cause: Error)

 * before AGENTS.md loading was rerouted onto the persistence kaos.
 */
function wrapReadTextWithError(inner: Kaos, cause: Error): Kaos {
  return new Proxy(inner, {
    get(target, prop, receiver) {
      if (prop === 'readText') {
        return async () => {
          throw cause;
        };
      }
      if (prop === 'readLines') {
        return async function* () {
          yield* [];
          throw cause;
        };
      }
      if (prop === 'withCwd') {
        return (cwd: string) => wrapReadTextWithError(target.withCwd(cwd), cause);
      }
      return Reflect.get(target, prop, receiver);
    },
  });
}