TypeError: Cannot read property 'toBeA' of undefined

Question

I am trying to test my code using expect in nodejs. I required expect in code and I wanted to use a feature of expect called toBeA(). But unfortunately I am receiving error and unable to solve it. So,I am posting it here.

const utils = require('./utils');
const expect = require('expect');
it('should add two numbers', () => {
    var result = utils.add(33,17);
    
    expect(result).toBe(50).toBeA('number');
}); 

   

This is my utils.js file

module.exports.add = (a,b) => {
    return a+b;
};

When I run the code I receive this error

 TypeError: Cannot read property 'toBeA' of undefined

Answer 1

You cannot chain tests. toBe doesn't return anything, hence the error. You want

expect(result).toBe(50);
expect(result).toBeA('number');

(although the first one implies the other so you might as well omit it)