Issues incrementing characters in a string (Javascript)-CodePudding

I have this code:

function shift(str) { let newStr = [];

    for (let i = 0; i < str.length; i  ) { 
    newStr[i] = String.fromCharCode(str[i].charCodeAt()   1 //numbers > 1 returns a successful unit test); 
}                                  
    newStr = newStr.join('');

    return newStr; 
}

console.log(shift('pie')); // returns qjf

module.exports = shift;

When I console.log my function it properly returns the expected string of qjf, however, when I try to run tests with Jest:


test('pie returns qjf', () => [ 
    expect(shift('pie)).toBe('qjf),
 ]);

Running tests returns: "test functions can only return Promise or undefined. Returned value: Array [undefined,]". Not sure what I'm doing wrong, thanks for any help!

CodePudding user response：

You are using square brackets instead of curly brackets in the test function. This should work:

test('pie returns qjf', () => { 
    expect(shift('pie')).toBe('qjf'),
});

CodePudding user response：

Your test function is wrapped in [] instead of {}. It also looks like you're missing a single quote in the shift() and tobe() functions parameters.