Create Your Own Matchers Part 1

expect.extend({
  toBeLargerThan(received, target) {
    const pass = received > target;
    if (pass) {
      return {
        message: () => `Expected ${received} To Be Larger Than ${target}`,
        pass: true,
      };
    } else {
      return {
        message: () =>
          `Error: Expected ${received} To Be Larger Than ${target}`,
        pass: false,
      };
    }
  },
});

test("Check If Number Is Larger Than Other Number", () => {
  expect(10).toBeLargerThan(9);
});