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Just how to accelerate Jest trial run by splitting as well as parallelising them|by Chirag Swadia|Aug, 2023 

If you compose practical examinations making use of Jest as well as Respond screening collection for your internet applications as well as like composing them over device examinations, after that quickly you will certainly understand that as your application expands, the variety of examinations will certainly expand.

As well as quickly you will certainly end up in a circumstance that your trial runs is taking mins or hrs (if you application is substantial) which enhances your construct time.

Jest variation ≥ 28

If you are making use of Jest variation 28+, after that you can conveniently utilize the examination sharding attribute where you can divide your examinations right into as lots of blocks as you desire and after that run them in parallel making use of identical work in your CI configuration.

I check out an excellent post regarding just how to utilize the jest fragments include as well as incorporate with you CI configuration. You can discover it below

Jest variation < < 28

Nonetheless, this post is for those that can not move to Banter 28 as a result of the damaging modifications they have actually presented, as well as are stuck on older variations.

There is still a method to produce your very own fragment as well as run both of them in parallel.

Mean your internet application is structured in the listed below method

- attributes
- FeatureA
- elements/
- examinations/
- assistants/
- FeatureB
- comonents/
- examinations/
- assistants/
- FeatureC
- comonents/
- examinations/
- assistants/

The primary purpose below is to determine just how you can essentially split your trial run right into purposeful fragments. In the above easy instance, we can conveniently divide the entire trial run right into 2 (or perhaps 3) by running them for FeatureA individually as well as FeatureB as well as FeatureC individually

So we will certainly have 2 CI work runnig in parallel

CI work 1– Runs examinations for FeatureA

CI work 2– Runs examinations for all attributes other than FeatureA

Just how to accomplish it

For this, you will certainly require to modify some jest config specifications as revealed listed below


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