Use bundler for test gem dependencies.

Closes Homebrew/homebrew#31986.
References Homebrew/homebrew#31981.

1 files changed, 8 insertions, 1 deletions

diff --git a/Library/Homebrew/cmd/tests.rb b/Library/Homebrew/cmd/tests.rb
index 5e7445769..623c14f04 100644
--- a/Library/Homebrew/cmd/tests.rb
+++ b/Library/Homebrew/cmd/tests.rb
@@ -2,7 +2,14 @@ module Homebrew
   def tests
     (HOMEBREW_LIBRARY/'Homebrew/test').cd do
       ENV['TESTOPTS'] = '-v' if ARGV.verbose?
-      system "rake", "deps", "test"
+      quiet_system("gem", "list", "--installed", "bundler") || \
+        system("gem", "install", "--no-ri", "--no-rdoc",
+               "--user-install", "bundler")
+      require 'rubygems'
+      ENV["PATH"] = "#{Gem.user_dir}/bin:#{ENV["PATH"]}"
+      quiet_system("bundle", "check") || \
+        system("bundle", "install", "--path", "vendor/bundle")
+      system "bundle", "exec", "rake", "test"
       exit $?.exitstatus
     end
   end