diff --git a/spec/bundler/support/helpers.rb b/spec/bundler/support/helpers.rb
index 4a0a07244c..a46292665b 100644
--- a/spec/bundler/support/helpers.rb
+++ b/spec/bundler/support/helpers.rb
@@ -314,14 +314,18 @@ module Spec
           "#{gem_repo}/gems/#{g}.gem"
         end
 
-        raise "OMG `#{path}` does not exist!" unless File.exist?(path)
-
-        gem_command! :install, "--no-document --ignore-dependencies '#{path}'"
+        install_gem(path)
 
         bundler_path && bundler_path.rmtree
       end
     end
 
+    def install_gem(path)
+      raise "OMG `#{path}` does not exist!" unless File.exist?(path)
+
+      gem_command! :install, "--no-document --ignore-dependencies '#{path}'"
+    end
+
     def with_gem_path_as(path)
       backup = ENV.to_hash
       ENV["GEM_HOME"] = path.to_s