tests: add test for multiple config in dotfolder

[anshumanv]

What kind of change does this PR introduce?

tests

Did you add tests for your changes?
Yes

If relevant, did you update the documentation?
NA

Summary

• Add tests when there are multiple configs present in dotfolder

Does this PR introduce a breaking change?
No

Other information

[anshumanv]

@evilebottnawi we presently only support reading .dev.js .prod.js files from .webpack folder, do we wish to support reading from root as well?

[anshumanv]

Presently root only supports webpack.config.*

[alexander-akait]

Yes, need support too

[anshumanv]

Will fix 👍

[alexander-akait]

@anshumanv Also webpack has none env, so I think we should support webpack.config.none.js, very rare case, but I think we should supports + I think we should support full naming like webpack.config.development.js and webpack.config.production.js

[anshumanv]

Sounds good, will fix 👍