Run tests with prism parser

[viralpraxis]

See https://metaredux.com/posts/2024/03/09/rubocop-1-62-introduces-experimental-support-for-prism.html and https://bugs.ruby-lang.org/issues/20564

[mikegee]

This will make RSpec skip it on prism and let us know when it starts working because RSpec enforces pending specs must fail.

https://rspec.info/features/3-12/rspec-core/pending-and-skipped-examples/

Suggested change

	context 'when the frozen_string_literal comment is true', unsupported_on: :prism do
	context 'when the frozen_string_literal comment is true' do
	pending 'Unsupported on prism' if ENV['PARSER_ENGINE'] == 'parser_prism'

We could consider extracting a helper:

def prism?
  ENV['PARSER_ENGINE'] == 'parser_prism'
end

[viralpraxis]

Thanks, I didn't know about this feature. However, is this case it's not a prism-related issue, this spec only passes with Ruby 2.7 parser (dynamic strings are not frozen by default since 3.0), and while all the specs run with 2.7 parser, setting PARSER_ENGINE to parser_prism automatically promotes the parser to 3.3. So this spec will never pass on prism.

[viralpraxis]

I added specs for default parser that run at Ruby 3.0 (it now covers this line).