Concurrent test in jest v29.7

concurrent.sample.test.ts

import { expect, test } from "@jest/globals";

function sum(...args: number[]): number {
  return args.reduce((acc, val) => acc + val, 0);
}

function isSumOddOrEven(...args: number[]): string {
  const total = sum(...args);

  if (total % 2 === 0) {
    return "even";
  } else {
    return "odd";
  }
}

describe("examples of running test concurrently", () => {
  test.concurrent.each`
  a    | b    | expected
  ${1} | ${1} | ${2}
  ${1} | ${2} | ${3}
  ${2} | ${1} | ${3}
`("returns $expected when $a is added to $b", async ({ a, b, expected }) => {
    expect(sum(a, b)).toBe(expected);
  });

  test.concurrent.each([
    [1, 1, 2],
    [1, 2, 3],
    [2, 1, 3]
  ])(`adding %i and %i returns %p`, async (a, b, expected) => {
    expect(sum(a, b)).toBe(expected);
  });

  test.concurrent.each<{
    a: number;
    b: number;
    result: string;
    isExpectedResult: boolean;
  }>`
    a    | b    | result    | isExpectedResult
    ${1} | ${2} | ${"odd"}  | ${true}
    ${3} | ${4} | ${"odd"}  | ${true}
    ${5} | ${5} | ${"even"} | ${true}
    ${2} | ${3} | ${"even"} | ${false}
  `(
    "Does adding $a and $b returns $result? $isExpectedResult",
    async ({ a, b, result, isExpectedResult }) => {
      expect(isSumOddOrEven(a, b) === result).toBe(isExpectedResult);
    }
  );

  test.concurrent.each([
    { nums: [1, 2, 3], result: "even", isExpectedResult: true },
    { nums: [1, 9, 4], result: "even" },
    { nums: [0, 2, 3], result: "even", isExpectedResult: false }
  ])(
    "Does adding $nums return $result? $isExpectedResult",
    async ({ nums, result, isExpectedResult = true }) => {
      expect(isSumOddOrEven(...nums) === result).toBe(isExpectedResult);
    }
  );

  test.concurrent.each([
    [[1, 2, 3], "even", true],
    [[1, 9, 4], "even"],
    [[0, 2, 3], "even", false]
  ])(
    "Does adding %o return %s? %p",
    async (nums, result, isExpectedResult = true) => {
      expect(isSumOddOrEven(...nums) === result).toBe(isExpectedResult);
    }
  );
});