fix: add runtime.events regression tests (#16044) (thanks @scifantastic)

src/sessions/transcript-events.test.ts

@@ -0,0 +1,35 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { emitSessionTranscriptUpdate, onSessionTranscriptUpdate } from "./transcript-events.js";
+
+const cleanup: Array<() => void> = [];
+
+afterEach(() => {
+  while (cleanup.length > 0) {
+    cleanup.pop()?.();
+  }
+});
+
+describe("transcript events", () => {
+  it("emits trimmed session file updates", () => {
+    const listener = vi.fn();
+    cleanup.push(onSessionTranscriptUpdate(listener));
+
+    emitSessionTranscriptUpdate("  /tmp/session.jsonl  ");
+
+    expect(listener).toHaveBeenCalledTimes(1);
+    expect(listener).toHaveBeenCalledWith({ sessionFile: "/tmp/session.jsonl" });
+  });
+
+  it("continues notifying other listeners when one throws", () => {
+    const first = vi.fn(() => {
+      throw new Error("boom");
+    });
+    const second = vi.fn();
+    cleanup.push(onSessionTranscriptUpdate(first));
+    cleanup.push(onSessionTranscriptUpdate(second));
+
+    expect(() => emitSessionTranscriptUpdate("/tmp/session.jsonl")).not.toThrow();
+    expect(first).toHaveBeenCalledTimes(1);
+    expect(second).toHaveBeenCalledTimes(1);
+  });
+});