How to use bejs

describe('hasHash', function () {
  it('should be return true', function () {
    let result = cryptor.hasHash('sha512');
    console.log(result);
    be.err.true(result);
  });
  it('should be return false', function () {
    let result = cryptor.hasHash('foooo');
    console.log(result);
    be.err.false(result);
  });
});

    let result = helper.is('hello', 'string');
    console.log(result);
    be.err.true(result);
  });
  it('should be return false', () => {
    let result = helper.is([], 'string');
    console.log(result);
    be.err.false(result);
  });
});
    let result = helper.defaults({a: 4, b: 5}, {a: 1, b: 2, c: 3});
    console.log(result);
    be.err.equal(result, {a: 4, b: 5, c: 3});
  });
  it('should be return false', () => {
    let result = helper.defaults({a: 4, b: 5}, {a: 1, b: 2, c: 3});
    console.log(result);
    be.err.not.equal(result, {a: 4, b: 5});
  });
});
    let result = helper.defaults({a: 4, b: 5, d: {a: 1}}, {a: 1, b: 2, c: 3, d: {a: 5, b: 2}});
    console.log(result);
    be.err.equal(result, {a: 4, b: 5, c: 3, d: {a: 1, b: 2}});
  });
});

describe('hash', function () {
  it('should be return true', function () {
    let hash = cryptor.hash('hello', 'sha512');
    console.log(hash);
    be.err.sha512(hash);
  });
  it('should be return false', function () {
    let hash = cryptor.hash('hello', 'sha256');
    console.log(hash);
    be.err.not.sha512(hash);
  });
  it('should be return error', function (done) {
    try {
      cryptor.hash('hello', 'sha256444');
    } catch (e) {
      console.log(e.message);
      done()
    }
  });
});