Expect assertions type error -> expect(…).toExist is not a function

Question

I\'m testing a nodejs app. Where I find this error when I run the test. The test script is below:

.expect( (res) => {
    expect(res.headers[\'x-auth\']).toE         


        

Answer 1

The expect assertion library has changed ownership. It was handed over to the Jest team, who in their infinite wisdom, created a new API.

You must now use 'toBeTruthy()' instead of 'toExist()'. You can still install expect as before, "npm install expect --save-dev", which is currently at version 21.2.1.Most methods names will remain unchanged except for a few, including 'toExist()'.