getNockPayloadCapturer.ts

getNockPayloadCapturer.sample.ts

const mockServer = nock("http://localhost", { allowUnmocked: false });

mockServer.put(`/api/clients/${client.id}/bills/bulk`).reply(200, bills);

const getCapturedPayload = getNockPayloadCapturer(mockServer);

await userEvent.click(screen.getByRole("button", { name: "Save" }));

const capturedPayload = await waitFor(getCapturedPayload);

expect(capturedPayload).toMatchInlineSnapshot()

getNockPayloadCapturer.ts

import type nock from "nock/types";

export function getNockPayloadCapturer(scope: nock.Scope) {
  const capturedPayloads: [string, unknown][] = [];

  const activeMocks = scope.activeMocks();

  const listener = (_req: unknown, _interceptorOptions: unknown, body: string) => {
    const capturedPayload = JSON.parse(body);
    capturedPayloads.push([activeMocks[capturedPayloads.length], capturedPayload]);
  };

  scope.on("request", listener);

  const getCapturedPayloads = () => {
    if (!scope.isDone() || capturedPayloads.length < activeMocks.length) {
      throw new Error("Not done capturing yet.");
    }
    scope.removeListener("request", listener);
    return capturedPayloads;
  };

  return getCapturedPayloads;
}