[rubygems/rubygems] Fix a couple of specs that were loading an incorrect bundler

We have a check on an `at_exit` hook that checks that system bundler is
never loaded instead of our development copy. The check was failing in
these cases, but in a silent way because the errors were being swallowed.

This commit changes these specs to make sure they load the right
bundler.

https://github.com/rubygems/rubygems/commit/cd1c1bc297

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/bundler/lock/lockfile_spec.rb b/spec/bundler/lock/lockfile_spec.rb
index ea2cad29e2..f79bc8add4 100644
--- a/spec/bundler/lock/lockfile_spec.rb
+++ b/spec/bundler/lock/lockfile_spec.rb
@@ -1438,7 +1438,7 @@ RSpec.describe "the lockfile format" do
 
         expect do
           ruby <<-RUBY
-                   require 'bundler'
+                   require '#{lib_dir}/bundler'
                    Bundler.setup
                  RUBY
         end.not_to change { File.mtime(bundled_app_lock) }