source: node_modules/node-abort-controller/__tests__/abort-controller.js

const { AbortController } = require("../index.js");

describe("AbortController", function () {
  it("should call abort handlers once", function () {
    const controller = new AbortController();
    const signal = controller.signal;
    const handler = jest.fn();

    expect(signal.onabort).toBeNull();
    expect(signal.aborted).toBe(false);
    expect(signal.reason).toBeUndefined();

    signal.onabort = jest.fn();
    signal.addEventListener("abort", handler);

    controller.abort();

    expect(signal.aborted).toBe(true);
    expect(signal.reason).toEqual(new Error("AbortError"));
    expect(handler).toBeCalledTimes(1);
    expect(handler).toBeCalledWith({ type: "abort", target: signal });
    expect(signal.onabort).toBeCalledTimes(1);
    expect(signal.onabort).toBeCalledWith({ type: "abort", target: signal });

    jest.clearAllMocks();
    controller.abort();

    expect(signal.aborted).toBe(true);
    expect(signal.reason).toEqual(new Error("AbortError"));
    expect(handler).not.toBeCalled();
    expect(signal.onabort).not.toBeCalled();
  });

  it("should use custom abort reason", () => {
    const controller = new AbortController();
    const signal = controller.signal;
    expect(signal.aborted).toBe(false);
    expect(signal.reason).toBeUndefined();

    const customReason = new Error("Custom Reason");
    controller.abort(customReason);

    expect(signal.aborted).toBe(true);
    expect(signal.reason).toBe(customReason);
  });
});