1 files changed, 34 insertions, 0 deletions
diff --git a/test/rubygems/test_gem_resolver_git_specification.rb b/test/rubygems/test_gem_resolver_git_specification.rb
index d724106f08..b0163bc782 100644
--- a/test/rubygems/test_gem_resolver_git_specification.rb
+++ b/test/rubygems/test_gem_resolver_git_specification.rb
@@ -46,5 +46,39 @@ class TestGemResolverGitSpecification < Gem::TestCase
     assert called
   end
 
+  # functional test for Gem::Ext::Builder
+
+  def test_install_extension
+    name, _, repository, = git_gem 'a', 1 do |s|
+      s.extensions << 'ext/extconf.rb'
+    end
+
+    Dir.chdir 'git/a' do
+      FileUtils.mkdir_p 'ext/lib'
+
+      open 'ext/extconf.rb', 'w' do |io|
+        io.puts 'require "mkmf"'
+        io.puts 'create_makefile "a"'
+      end
+
+      FileUtils.touch 'ext/lib/b.rb'
+
+      system @git, 'add', 'ext/extconf.rb'
+      system @git, 'add', 'ext/lib/b.rb'
+
+      system @git, 'commit', '--quiet', '-m', 'Add extension files'
+    end
+
+    source = Gem::Source::Git.new name, repository, 'master', true
+
+    spec = source.specs.first
+
+    git_spec = Gem::Resolver::GitSpecification.new @set, spec, source
+
+    git_spec.install({})
+
+    assert_path_exists File.join git_spec.spec.extension_install_dir, 'b.rb'
+  end
+
 end