Difference between describe() and test() in Jest

Question

I have found that expect() works within describe(). So the function test() is not necessary, if I see it right. Do I see it right?

In other words, is it enough to write that:

const sum = require('./sum'); describe('adds 1 + 2 to equal 3', () => { expect(sum(1, 2)).toBe(3); });

Or does that bring advantages:

 const sum = require('./sum'); describe('test sum', () => { test('adds 1 + 2 to equal 3', () => { expect(sum(1, 2)).toBe(3); }); });

Try a failing test and see where it gets you. A single test isn't a good example because you can just use test (or it) without describe. — jonrsharpe
– jonrsharpe, Commented Oct 16, 2021 at 21:38
Does this answer your question? What is the difference between describe and it in Jest? — jonrsharpe
– jonrsharpe, Commented Oct 16, 2021 at 21:41

jonrsharpe · Accepted Answer · 2021-10-16 21:40:06Z

4

describe(name, fn) creates a block that groups together several related tests.

Detail: https://jestjs.io/docs/api#describename-fn

edited Oct 16, 2021 at 21:40

jonrsharpe

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answered Oct 16, 2021 at 17:26

Tony Yip

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2 Comments

astridx Over a year ago

Thanks for your answer. But I want to know, if it is fine, to use my fist example without the test()-methode, because it works - it also show failing tests.

Tony Yip Over a year ago

@astridx I never try this before and I wouldn't do this. If you only want one layer, use test instead of describe. I think the test report might get wrong if you use your first example

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