expectError.ts

import { expect as baseExpect } from "@playwright/test";
import type { APIResponse } from "@playwright/test";

export const expect = baseExpect.extend({
  async responseToHaveErrorStatusCode(
    requestFunction: () => Promise<APIResponse>,
    expected: number
  ) {
    const assertionName = "responseToHaveErrorStatusCode";

    let pass: boolean;
    let message: string;
    let actual: number;

    try {
      const r = await requestFunction();
      pass = false;
      actual = r.status();
      message = `Expected request to to have error status code, but got: ${r.status()}`;
    } catch (e: any) {
      actual = e.response.status() as number;
      pass = actual === expected;
      message = `Expected request to have status code: ${expected}, but got: ${actual}`;
      pass = false;
    }

    return {
      message,
      pass,
      name: assertionName,
      expected,
      actual,
    };
  },
});