adding monkeytype

frontend/__tests__/hooks/createEvent.spec.ts

@@ -0,0 +1,81 @@
+import { createRoot } from "solid-js";
+import { describe, expect, it, vi } from "vitest";
+import { createEvent } from "../../src/ts/hooks/createEvent";
+
+describe("createEvent", () => {
+  it("dispatch notifies subscribers", () => {
+    const event = createEvent<string>();
+    const fn = vi.fn();
+    event.subscribe(fn);
+    event.dispatch("hello");
+    expect(fn).toHaveBeenCalledWith("hello");
+  });
+
+  it("dispatch notifies multiple subscribers", () => {
+    const event = createEvent<number>();
+    const fn1 = vi.fn();
+    const fn2 = vi.fn();
+    event.subscribe(fn1);
+    event.subscribe(fn2);
+    event.dispatch(42);
+    expect(fn1).toHaveBeenCalledWith(42);
+    expect(fn2).toHaveBeenCalledWith(42);
+  });
+
+  it("dispatch with no type arg requires no arguments", () => {
+    const event = createEvent();
+    const fn = vi.fn();
+    event.subscribe(fn);
+    event.dispatch();
+    expect(fn).toHaveBeenCalledTimes(1);
+  });
+
+  it("subscribe returns an unsubscribe function", () => {
+    const event = createEvent<string>();
+    const fn = vi.fn();
+    const unsub = event.subscribe(fn);
+    event.dispatch("a");
+    unsub();
+    event.dispatch("b");
+    expect(fn).toHaveBeenCalledTimes(1);
+    expect(fn).toHaveBeenCalledWith("a");
+  });
+
+  it("two independent events do not share state", () => {
+    const eventA = createEvent<string>();
+    const eventB = createEvent<string>();
+    const fnA = vi.fn();
+    const fnB = vi.fn();
+    eventA.subscribe(fnA);
+    eventB.subscribe(fnB);
+    eventA.dispatch("a");
+    expect(fnA).toHaveBeenCalledWith("a");
+    expect(fnB).not.toHaveBeenCalled();
+  });
+
+  it("useListener auto-unsubscribes on dispose", () => {
+    const event = createEvent<string>();
+    const fn = vi.fn();
+    createRoot((dispose) => {
+      event.useListener(fn);
+      event.dispatch("inside");
+      dispose();
+    });
+    event.dispatch("outside");
+    expect(fn).toHaveBeenCalledTimes(1);
+    expect(fn).toHaveBeenCalledWith("inside");
+  });
+
+  it("subscriber errors do not prevent other subscribers from running", () => {
+    const event = createEvent<string>();
+    const fn1 = vi.fn(() => {
+      throw new Error("oops");
+    });
+    const fn2 = vi.fn();
+    event.subscribe(fn1);
+    event.subscribe(fn2);
+    event.dispatch("test");
+    expect(fn1).toHaveBeenCalled();
+    expect(fn2).toHaveBeenCalled();
+  });
+});