README of Unit Testing section refers to something that doesn't exist

[mjkrause]

Description

Check line Back to the Jest config, you can see the next option is testRegex. This is the pattern telling Jest which files contain tests. The pattern above matches any .js file inside a __tests__ directory,... in gatsby/docs/docs/unit-testing.md.
There is no variable named testRegex in the above example of jest.config.js. I have seen somewhere below in that file, though. In any case, that reference doesn't seem to be correct.

Steps to reproduce

see description

Expected result

Remove that reference, or put testRegex = ... into the example.

[kakadiadarpan]

@mjkrause the best way of going through the Gatsby documentation would be through www.gatsbyjs.org, the links would not work as expected in the Github's README.md

For unit testing, please check the following link on gatsbyjs.org: https://www.gatsbyjs.org/docs/unit-testing/

[LekoArts]

No, you’re misunderstanding something here @kakadiadarpan
The text mentions a testRegex that was there before but @DSchau removed that from the config file with his last commit

[kakadiadarpan]

I can see the testRegex in the jest config file. Please check the attached screenshot below:

[DSchau]

Yeah, whoops! Easy fix to remove and re-arrange that paragraph. I did remove the option from jest.config.js because it wasn't necessary for JS files, but is still necessary for Typescript.

Someone want to tackle this? If not, one of us will get to it as soon as we can!

[RobinCsl]

I believe this issue can be closed now, since my PR was merged.
cc @DSchau @LekoArts @shannonbux