I am using Jest to test my Node.JS application and when I run my tests, some built-in functions don't work, it seems like they are not defined. For instance, toContainEqual
and toBeInstanceOf
.
Here is example of my code:
it('should delete DB entry', () => query(url, queryString)
.then(res => res.json()
.then(() => db.collection('exercises').find({}).toArray()))
.then(res => expect(res).toContainEqual(originalExercise)))
And the error I'm getting:
TypeError: expect(...).toContainEqual is not a function
But the other functions (like toEqual
, toBeTruthy
) work fine though.
I am using Jest v15.1.1 (according to jest -v
).
How can I deal with it?
toContainEqual
and toBeInstanceOf
is NOT included in v15.1.1 yet. To use these 2 matchers, you need to install [email protected], or just wait for the next release.
According to the Jest code history, toContainEqual
was merged on Sep. 20th (https://github.com/facebook/jest/pull/1706) and toBeInstanceOf
was merged on Sep. 7th (https://github.com/facebook/jest/pull/1625). However, v15.1.1 was released on Sep. 2th.
It seems the API page of Jest should be changed, so that un-released API won't be included.
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