Regression in bundler 2.5.3

[jcoyne]

Bundler no longer bundles development dependencies listed in gemspec

I'm seeing:

Failure/Error: require 'simplecov'

LoadError:
  cannot load such file -- simplecov
# ./spec/spec_helper.rb:9:in `require'
# ./spec/spec_helper.rb:9:in `<top (required)>'
No examples found.

You can see that in this PR I have one commit using 2.5.2 where it works as expected and a commit where it fails using 2.5.3:
projectblacklight/blacklight#3117

I think this means #7319 is the culprit since it is the only change in 2.5.3 according to 9f9ba21

Curiously I do see the message:

A gemspec development dependency (rsolr, >= 1.0.6, < 3) is being overridden by a Gemfile dependency (rsolr, >= 1.0, < 3).

But there is nothing about simplecov.

[deivid-rodriguez]

Funny I had just discovered an issue that seems similar. Can you check if the change in #7358 fixes it?

[jcoyne]

@deivid-rodriguez I'm not quite certain how you can install bundler/rubygems from source in order to test it out.

[deivid-rodriguez]

You'd need to clone the repo, run rake install:bundler, and make sure your lockfile is locked to 2.6.0.dev.

[jcoyne]

@deivid-rodriguez yes, using that branch fixes the problem. Thanks for the help with the instructions.

[deivid-rodriguez]

Fixed by #7358.