fix .toThrow for promises #4884

lstkz · 2017-11-13T16:19:25Z

From docs

return expect(Promise.reject('octopus')).rejects.toBe('octopus');

In real app, an Error object must be rejected.
Fixed to

return expect(Promise.reject(new Error('octopus'))).rejects.toThrow('octopus');

fixes #3601 Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

codecov-io · 2017-11-13T16:36:41Z

Codecov Report

Merging #4884 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
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  Coverage   59.75%   59.75%           
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  Files         195      195           
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SimenB

This is awesome! Thanks for tackling it.

Could you update the changelog as well?

SimenB · 2017-11-13T20:25:54Z

docs/ExpectAPI.md

@@ -416,15 +416,15 @@ For example, this code tests that the promise rejects with reason `'octopus'`:
 ```js
 test('rejects to octopus', () => {
  // make sure to add a return statement
-  return expect(Promise.reject('octopus')).rejects.toBe('octopus');
+  return expect(Promise.reject(new Error('octopus'))).rejects.toThrow('octopus');


This old example is still valid, right?

(although it's not recommended to reject with a non-error)

yes, it still works

Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

lstkz · 2017-11-14T07:12:09Z

@SimenB
changelog updated

SimenB · 2017-11-14T07:29:35Z

docs/ExpectAPI.md

 });
 ```

 Alternatively, you can use `async/await` in combination with `.rejects`.

 ```js
 test('rejects to octopus', async () => {
-  await expect(Promise.reject('octopus')).rejects.toBe('octopus');
+  await expect(Promise.reject(new Error('octopus'))).rejects.toThrow('octopus');


I'm wondering if we should say that toThrow only works in jest 21.3.0+. People copy-paste examples, and having them not working is not a good UX

currently, it mentions

### `.rejects` ##### available in Jest **20.0.0+**

Change it to 21.3.0+?

Or a separate line describing rejecting promises and toThrow.

@lsentkiewicz this came up in #4945, mind sending a PR with clarification? 🙂

really painful way to discover why rejects.toThrow was not working on my jest@21.2 setup

@SimenB you were right, it is probably a good idea to have a mention to it in the docs

Can you send a PR fixing the docs?

cpojer · 2017-11-14T12:52:55Z

Nice!

Turbo87 · 2017-11-22T13:06:23Z

is there a new release planned including this fix? it seems impossible currently to correctly test for Promise rejections 🤔

rraziel · 2017-11-22T16:36:22Z

Shouldn't it be toThrowError rather than toThrow?
Or would both work with this pull request?

lstkz · 2017-11-22T20:02:34Z

both methods work

SimenB · 2017-11-22T21:01:27Z

@Turbo87 it's out as jest@test (beta 9, I believe)

* Beta version because it has a bug fix for testing rejected promises: * jestjs/jest#4884 * Needed for upcoming unit tests for events/schedules API

According to jestjs#4884

github-actions · 2021-05-12T23:07:22Z

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lstkz added 2 commits November 13, 2017 17:00

fix .toThrow for promises

5915f91

fixes #3601 Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

keep original matcherName

4bbccfd

Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

facebook-github-bot added the CLA Signed ✔️ label Nov 13, 2017

fix flow

b778d5d

Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

SimenB approved these changes Nov 13, 2017

View reviewed changes

SimenB reviewed Nov 13, 2017

View reviewed changes

update changelog

b492b59

Signed-off-by: Łukasz Sentkiewicz <sirmims@gmail.com>

SimenB reviewed Nov 14, 2017

View reviewed changes

cpojer merged commit 38c2cf7 into jestjs:master Nov 14, 2017

eric4545 mentioned this pull request Nov 24, 2017

example expect().rejects.toThrow not working as expected #4945

Closed

SimenB mentioned this pull request Nov 24, 2017

toThrowErrorMatchingSnapshot does not work with promises #4946

Closed

sdunster added a commit to NSWSESMembers/availability-poc that referenced this pull request Dec 3, 2017

Upgrade jest

d2c4884

* Beta version because it has a bug fix for testing rejected promises: * jestjs/jest#4884 * Needed for upcoming unit tests for events/schedules API

sdunster mentioned this pull request Dec 3, 2017

Upgrade jest NSWSESMembers/availability-poc#100

Merged

sdunster added a commit to NSWSESMembers/availability-poc that referenced this pull request Dec 3, 2017

Upgrade jest

eafd13c

* Beta version because it has a bug fix for testing rejected promises: * jestjs/jest#4884 * Needed for upcoming unit tests for events/schedules API

julienw mentioned this pull request Dec 5, 2017

rejects.toThrowError #3601

Closed

SimenB mentioned this pull request Dec 13, 2017

Expect rejects async/await documentation example fails #5076

Closed

reficul31 mentioned this pull request Dec 22, 2017

Tests for Util Module WorldBrain/Memex#233

Merged

kimjoar mentioned this pull request Jan 15, 2018

Remove syncify elastic/eui#306

Merged

renovate-tests mentioned this pull request Feb 6, 2018

Update dependency jest to v22 - autoclosed renovate-tests/changelog-md#3

Closed

renovate bot mentioned this pull request Feb 14, 2018

fix(deps): update dependency jest to ^22.0.0 manekinekko/devoxx-assistant#3

Open

peterdanis mentioned this pull request Feb 26, 2018

[WIP] Make toThrow matcher pass only if Error-like object is returned from promises #5670

Merged

SimenB mentioned this pull request Jun 16, 2018

Correct erroneous rejects test example #6421

Closed

nodkz added a commit to nodkz/jest that referenced this pull request Sep 19, 2018

docs: fix rejects.toMatch on rejects.toThrow

ddb0c26

According to jestjs#4884

nodkz mentioned this pull request Sep 19, 2018

docs: fix rejects.toMatch on rejects.toThrow #6999

Merged

SimenB mentioned this pull request Nov 29, 2018

Correct example usage of expect().rejects #7431

Closed

nshaikhinurov mentioned this pull request Mar 17, 2019

rejects.toThrowError again #8140

Closed

outofambit mentioned this pull request May 1, 2019

Standardize on awaiting expect statements for functions that throw errors in tests desktop/desktop#7442

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fix .toThrow for promises #4884

fix .toThrow for promises #4884

lstkz commented Nov 13, 2017

codecov-io commented Nov 13, 2017 •

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fix .toThrow for promises #4884

fix .toThrow for promises #4884

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lstkz commented Nov 13, 2017

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cpojer commented Nov 14, 2017

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rraziel commented Nov 22, 2017

lstkz commented Nov 22, 2017

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