Add instruction for running unit tests in parallel (#13928)

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Ashish Kumar 2022-09-28 16:44:35 +05:30 committed by GitHub
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Add instruction to contributing guide for running unit tests in parallel. Contributed by @ashfame.

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@ -167,6 +167,12 @@ was broken. They are slower than the linters but will typically catch more error
poetry run trial tests
```
You can run unit tests in parallel by specifying `-jX` argument to `trial` where `X` is the number of parallel runners you want. To use 4 cpu cores, you would run them like:
```sh
poetry run trial -j4 tests
```
If you wish to only run *some* unit tests, you may specify
another module instead of `tests` - or a test class or a method: