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Throw a descriptive error if the first argument supplied to a hook was not a function #6917

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merged 6 commits into from
Aug 30, 2018
Merged

Throw a descriptive error if the first argument supplied to a hook was not a function #6917

merged 6 commits into from
Aug 30, 2018

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ranyitz
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@ranyitz ranyitz commented Aug 29, 2018

Summary

This PR closes #6903 By adding validation for the first argument of the following hooks:

  • beforeEach
  • beforeAll
  • afterEach
  • afterAll

If the first argument was not a function Jest will throw a descriptive error:

image

Additional notes

  • I've upgraded flow-typed's Jest definition file to v23, because v21 didn't have support for jest.each.

Test plan

Verified that passing a string as first argument will throw an error, on both jasmine and circus runners.

@ranyitz ranyitz mentioned this pull request Aug 29, 2018
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codecov-io commented Aug 29, 2018 •
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Codecov Report

Merging #6917 into master will decrease coverage by <.01%.
The diff coverage is 20%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #6917      +/-   ##
==========================================
- Coverage   66.98%   66.97%   -0.01%     
==========================================
  Files         250      250              
  Lines       10365    10375      +10     
  Branches        4        3       -1     
==========================================
+ Hits         6943     6949       +6     
- Misses       3421     3425       +4     
  Partials        1        1
Impacted Files Coverage Δ
packages/jest-jasmine2/src/jasmine/Env.js 0% <0%> (ø) ⬆️
packages/jest-circus/src/index.js 66.66% <100%> (+8.97%) ⬆️

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@thymikee thymikee requested a review from SimenB August 30, 2018 07:27
SimenB
SimenB reviewed Aug 30, 2018
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packages/jest-circus/src/__tests__/hooks_error.test.js
const circus = require('../index.js');

describe('hooks error throwing', () => {
test.each([['beforeEach'], ['beforeAll'], ['afterEach'], ['afterAll']])(
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we don't need the nested arrays, can be just test.each(['beforeEach', 'beforeAll', 'afterEach', 'afterAll'])(

SimenB
SimenB reviewed Aug 30, 2018
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packages/jest-circus/src/__tests__/hooks_error.test.js Outdated
expect(() => {
circus[fn]('param');
}).toThrowError(
`Invalid first argument, param. It must be a callback function.`,
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single quotes?

SimenB
SimenB approved these changes Aug 30, 2018
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This is awesome, thanks!

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SimenB commented Aug 30, 2018 •
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Aww, the typing info is wrong :( (#6351)

@SimenB SimenB merged commit 66560c3 into jestjs:master Aug 30, 2018
@ranyitz ranyitz deleted the hooks-first-argument-validation branch August 30, 2018 08:44
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ranyitz commented Aug 30, 2018

Thanks @SimenB 👍

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@SimenB SimenB SimenB approved these changes

@thymikee thymikee thymikee approved these changes

@mattphillips mattphillips mattphillips approved these changes

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Successfully merging this pull request may close these issues.

Naming the beforeEach function produces imprecise error: fn.call is not a function
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@ranyitz @codecov-io @SimenB @thymikee @mattphillips @facebook-github-bot