text: const checkEmail = require("./exercise39");
  
  test("Check if function checkEmail is define", () => {
    expect(checkEmail).toBeDefined();
  });
  
  test("Check the function checkEmail", () => {
    expect(checkEmail("hola@hotmail.com")).toEqual(true);
  });
  
  test("Check the function checkEmail", () => {
    expect(checkEmail("holahotmail.com")).toEqual(false);
  });
  