Add Jest 23 Blog Post #6332

rickhanlonii · 2018-05-28T23:03:55Z

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##           master    #6332   +/-   ##
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  Coverage   63.89%   63.89%           
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  Files         228      228           
  Lines        8705     8705           
  Branches        3        4    +1     
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  Hits         5562     5562           
  Misses       3142     3142           
  Partials        1        1

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thymikee

Nice post! Left some minor nits to fix

thymikee · 2018-05-29T05:02:15Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+* **Require test descriptions**: We're now failing tests that do not include a description.
+* **Remove undefined props from React snapshots:** Smaller snapshots and proper React behavior.
+* **Remove deprecations**: We've removed mapCoverage since it's no longer needed. Additionally, we removed `jest.genMockFunction` and `jest.genMockFn` since these are the same `jest.fn`.


The same as jest.fn

thymikee · 2018-05-29T05:03:48Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+Today we are excited to announce Jest 23, our largest major release to date! Together with over 100 contributors, we've shipped a ton of features and bug fixes. Thank you to everyone in the community for helping make JavaScript Testing Delightful.
+
+We would also like to welcome Webpack to the Jest community! After converting from Mocha to Jest 23 Beta, their total test suite time was reduced 6x from over 13 minutes to 2 minutes 20 seconds. #blazingmeansgood


A link to the tweet for the blazing tag maybe :D

thymikee · 2018-05-29T05:06:43Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+## Jest Each
+
+[@mattphillipsio](https://twitter.com/mattphillipsio) has donated the `jest-each` package to Jest Core (thanks Matt!). jest-each is a library inspired by [mocha-each](https://yarnpkg.com/en/package/mocha-each) and [Spock Data Tables](http://spockframework.org/spock/docs/1.1/data_driven_testing.html#data-tables) which allows you to define a table of test cases, and then run a test for each row with the specified column values. We support both array types and template literals for all flavors of `describe` and `test`. Docs are available [here](https://facebook.github.io/jest/docs/en/api.html#testeachtable-name-fn), and for those not on Jest 23 yet, we're still publishing [jest-each](https://yarnpkg.com/en/package/jest-each) separately!


Add backticks to library name

thymikee · 2018-05-29T05:09:13Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+## Debug Hanging Tests
+
+A common issue we see on the issue tracker relates to “Jest” hanging after a test run. This is usually due to app code leaving handles open, preventing Jest from exiting. In the past, users have resorted to `—forceExit` to fix (not recommended).
+


Double dash in flag

thymikee · 2018-05-29T05:24:03Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+* **Require test descriptions**: We're now failing tests that do not include a description.
+* **Remove undefined props from React snapshots:** Smaller snapshots and proper React behavior.
+* **Remove deprecations**: We've removed mapCoverage since it's no longer needed. Additionally, we removed `jest.genMockFunction` and `jest.genMockFn` since these are the same `jest.fn`.
+* **Add snapshot names to failures: **We added the snapshot name (if provided) to the snapshot failure message so it's easier to find the snapshot that's failing.


There need to be a space between ** and We, otherwise it breaks styling

thymikee · 2018-05-29T05:24:46Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+* **Watch mode coverage**: Coverage is now limited to only the files tested in watch mode or when using `—onlyChanged` and `—findRelatedTests`.
+* **Version documentation:** We added docs for each minor release back to Jest 22, and have removed all of the “Requires Jest X.X+” from the docs.
+* **Better snapshot summaries: **We overhauled the Snapshot Summary output to make obsolete snapshots more informative.


Same thing with **

thymikee · 2018-05-29T05:27:30Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+## Other Improvements
+
+* **Watch mode coverage**: Coverage is now limited to only the files tested in watch mode or when using `—onlyChanged` and `—findRelatedTests`.


Make sure all the flags are double dashed

thymikee · 2018-05-29T05:30:10Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+As with every major release, we are making a few breaking changes to make larger changes in the future possible and to push the testing experience to a new level. Here's a list of the biggest changes you may see:
+
+* **Require test descriptions**: We're now failing tests that do not include a description.


Wasn't it test callbacks? Or is it something else than #5558

we need 2 args always, so both 🙂

I think it's both @SimenB can you confirm?

SimenB · 2018-05-29T06:37:36Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+As with every major release, we are making a few breaking changes to make larger changes in the future possible and to push the testing experience to a new level. Here's a list of the biggest changes you may see:
+
+* **Require test descriptions**: We're now failing tests that do not include a description.
+* **Remove undefined props from React snapshots:** Smaller snapshots and proper React behavior.


inconsistent ** before or after the :

SimenB · 2018-05-29T06:38:29Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+## Jest Summit
+
+Last week, the Jest Core Team met for the Jest Summit at Facebook London where worked on and released Jest 23, announced the Jest Open Collective, and gave a number of talks:


mention they'll be posted soon:tm:?

the videos, that is

Hoping to update this with the links before go-live

SimenB · 2018-05-29T06:39:21Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+We have completely rewritten the watch mode system to allow adding custom plugins to watch mode. Watch Mode Plugins now make it possible to hook into Jest events and provide custom menu options in the Watch Mode Menu. All of the default Watch Mode prompts are implemented as plugins in this system, and the docs to create your own are available [here](https://facebook.github.io/jest/docs/en/watch-plugins.html).
+
+With this change, we're also now able to bring back typeahead support as a Watch Mode Plugin via [](https://github.com/rogeliog/jest-plugin-filename)[jest-plugin-filename](https://github.com/jest-community/jest-plugin-filename)!


link here looks weird

SimenB · 2018-05-29T06:40:19Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+We only add matchers to core if we believe they will be useful to a large amount of people in the Jest community, and leave the majority of matchers to the community (see [jest-extended](https://yarnpkg.com/en/package/jest-extended)). Some matchers make the cut into core, and Jest 23 adds:
+
+* nthCalledWith


something about the fact that mocks now track returned and thrown values would be nice

SimenB · 2018-05-29T06:42:18Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+## Snapshot Property Matchers
+
+Often times, objects you're snapshotting contain generated values like Dates and IDs. Jest now allows you to pass properties to the snapshot matcher which specify the structure of the data instead of the specific values. These property matchers are then verified before serializing the matcher type (instead of the value), giving you consistent snapshot results across test runs.


not a native speaker, but

SimenB · 2018-05-29T06:42:51Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

@@ -0,0 +1,124 @@
+---
+title: Jest 23: 🚀 Blazing Fast Delightful Testing


replace 🚀 with 🔥?

SimenB · 2018-05-29T09:26:56Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+
+See [jest-plugin-filename](https://github.com/jest-community/jest-plugin-filename) for documentation and install instructions. Huge thank you to [@rogeliog](https://twitter.com/rogeliog) for the new watch mode plugin system and the jest-plugin-filename plugin!
+
+## Breaking Changes


also #6244 (comment)

mattphillips · 2018-05-29T11:23:23Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+* **Aaaron Abramov** – Writing Meaningful Tests
+* **Rick Hanlon II** – Blazing Fast Snapshot Testing in Jest 23
+* **Simen Bekkhus** – Jest's Delightful Error Messages
+* **Matt Philips** – Level up your Jest experience with community packages


Two ls in Phillips 😛

rickhanlonii · 2018-05-29T14:28:29Z

Thanks all, fixes pushed!

SimenB · 2018-05-29T14:28:33Z

website/blog/2018-05-29-jest-23-blazing-fast-delightful-testing.md

+* **Better stack traces**: We added stack traces to asynchronous errors, timeout errors, expect.assertions, and thrown non-errors. We're also indicating the column in the code frame!
+* **Better React 16 support**: Adds snapshot support for `React.Fragment`, `React.forwardRef`, and `React.createContext`.
+* **Track mock return and throw values**: Adds `mock.results` that contains the return value or thrown value for each mock call.
+* **Blazing 🔥**: We've added a blazing badge to the README to indicate that Jest is blazing good.


SimenB

Would be awesome to have links to the summit video(s) before publish, but the post LGTM

github-actions · 2021-05-12T13:15:23Z

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Add Jest 23 Blog Post

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Add Jest 23 Blog Post #6332

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		Today we are excited to announce Jest 23, our largest major release to date! Together with over 100 contributors, we've shipped a ton of features and bug fixes. Thank you to everyone in the community for helping make JavaScript Testing Delightful.

		We would also like to welcome Webpack to the Jest community! After converting from Mocha to Jest 23 Beta, their total test suite time was reduced 6x from over 13 minutes to 2 minutes 20 seconds. #blazingmeansgood


		## Jest Each

		[@mattphillipsio](https://twitter.com/mattphillipsio) has donated the `jest-each` package to Jest Core (thanks Matt!). jest-each is a library inspired by [mocha-each](https://yarnpkg.com/en/package/mocha-each) and [Spock Data Tables](http://spockframework.org/spock/docs/1.1/data_driven_testing.html#data-tables) which allows you to define a table of test cases, and then run a test for each row with the specified column values. We support both array types and template literals for all flavors of `describe` and `test`. Docs are available [here](https://facebook.github.io/jest/docs/en/api.html#testeachtable-name-fn), and for those not on Jest 23 yet, we're still publishing [jest-each](https://yarnpkg.com/en/package/jest-each) separately!

		## Debug Hanging Tests

		A common issue we see on the issue tracker relates to “Jest” hanging after a test run. This is usually due to app code leaving handles open, preventing Jest from exiting. In the past, users have resorted to `—forceExit` to fix (not recommended).


		## Other Improvements

		* Watch mode coverage: Coverage is now limited to only the files tested in watch mode or when using `—onlyChanged` and `—findRelatedTests`.


		As with every major release, we are making a few breaking changes to make larger changes in the future possible and to push the testing experience to a new level. Here's a list of the biggest changes you may see:

		* Require test descriptions: We're now failing tests that do not include a description.


		## Jest Summit

		Last week, the Jest Core Team met for the Jest Summit at Facebook London where worked on and released Jest 23, announced the Jest Open Collective, and gave a number of talks:


		We have completely rewritten the watch mode system to allow adding custom plugins to watch mode. Watch Mode Plugins now make it possible to hook into Jest events and provide custom menu options in the Watch Mode Menu. All of the default Watch Mode prompts are implemented as plugins in this system, and the docs to create your own are available [here](https://facebook.github.io/jest/docs/en/watch-plugins.html).

		With this change, we're also now able to bring back typeahead support as a Watch Mode Plugin via [](https://github.com/rogeliog/jest-plugin-filename)[jest-plugin-filename](https://github.com/jest-community/jest-plugin-filename)!


		We only add matchers to core if we believe they will be useful to a large amount of people in the Jest community, and leave the majority of matchers to the community (see [jest-extended](https://yarnpkg.com/en/package/jest-extended)). Some matchers make the cut into core, and Jest 23 adds:

		* nthCalledWith


		## Snapshot Property Matchers

		Often times, objects you're snapshotting contain generated values like Dates and IDs. Jest now allows you to pass properties to the snapshot matcher which specify the structure of the data instead of the specific values. These property matchers are then verified before serializing the matcher type (instead of the value), giving you consistent snapshot results across test runs.

		@@ -0,0 +1,124 @@
		---
		title: Jest 23: 🚀 Blazing Fast Delightful Testing


		See [jest-plugin-filename](https://github.com/jest-community/jest-plugin-filename) for documentation and install instructions. Huge thank you to [@rogeliog](https://twitter.com/rogeliog) for the new watch mode plugin system and the jest-plugin-filename plugin!

		## Breaking Changes

Add Jest 23 Blog Post #6332

Add Jest 23 Blog Post #6332

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