* lib/rubygems: Update to RubyGems master 50a8210. Important changes

in this commit:

  RubyGems now automatically checks for gem.deps.rb or Gemfile when
  running ruby executables.  This behavior is similar to `bundle exec
  rake`.  This change may be reverted before Ruby 2.1.0 if too many bugs
  are found.

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43767 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rubygems/test_gem_resolver_git_set.rb

@@ -66,6 +66,24 @@ class TestGemResolverGitSet < Gem::TestCase
     refute_empty @set.specs
   end
 
+  def test_prefetch_cache
+    name, _, repository, = git_gem
+
+    @set.add_git_gem name, repository, 'master', false
+
+    dependency = dep name
+    req = Gem::Resolver::ActivationRequest.new dependency, nil
+    @reqs.add req
+
+    @set.prefetch @reqs
+
+    spec = @set.specs[name]
+
+    @set.prefetch @reqs
+
+    assert_same spec, @set.specs[name]
+  end
+
   def test_prefetch_filter
     name, _, repository, = git_gem
 
@@ -77,7 +95,7 @@ class TestGemResolverGitSet < Gem::TestCase
 
     @set.prefetch @reqs
 
-    assert_empty @set.specs
+    refute_empty @set.specs, 'the git source does not filter'
   end
 
 end