tests: Use Parser to parse args

[GauthamGoli]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

#1860

This is a backwards incompatible change for --seed

[MikeMcQuaid]

This is a backwards incompatible change for --seed

@GauthamGoli We'll need to support the --key=value format for some other commands. Why is it not posssible for --seed but is for --only?

[GauthamGoli]

@MikeMcQuaid --seed was of --key value format, now it is of --key=value format

[MikeMcQuaid]

@GauthamGoli Ah, gotcha, yes, misread! Thanks again!

[ilovezfs]

It would be nice if, in general, --key val and --key=val both worked for Homebrew commands. I think it's a common error for people to

brew bump-formula-pr --url https://github.com/macvim-dev/macvim/archive/snapshot-146.tar.gz --version=8.0-146 macvim

when they mean

brew bump-formula-pr --url=https://github.com/macvim-dev/macvim/archive/snapshot-146.tar.gz --version=8.0-146 macvim

and the error message is about as strange as you could imagine

Josephs-MacBook-Pro:Formula joe$ brew bump-formula-pr --url https://github.com/macvim-dev/macvim/archive/snapshot-146.tar.gz --version=8.0-146 macvim
##################################################################################################################################################################################################### 100.0%
Error: snapshot-146.tar.gz: /Users/joe/Library/Caches/Homebrew/Formula/snapshot-146.tar.gz:1: Invalid char `\x1F' in expression
/Users/joe/Library/Caches/Homebrew/Formula/snapshot-146.tar.gz:1: invalid multibyte char (UTF-8)
Josephs-MacBook-Pro:Formula joe$ 

[GauthamGoli]

@ilovezfs Actually, OptionParser supports both, so both ways would work for Homebrew and I was wrong in saying this is a backwards incompatible change

[GauthamGoli]

And no more weird errors once I add Parser support in bump-formula-pr 👍