1 files changed, 13 insertions, 0 deletions
diff --git a/lib/bundler/shared_helpers.rb b/lib/bundler/shared_helpers.rb
index da2a384d29..d259f20e6b 100644
--- a/lib/bundler/shared_helpers.rb
+++ b/lib/bundler/shared_helpers.rb
@@ -253,6 +253,19 @@ module Bundler
       current  = File.expand_path(SharedHelpers.pwd).untaint
 
       until !File.directory?(current) || current == previous
+        if ENV["BUNDLE_SPEC_RUN"]
+          # avoid stepping above the tmp directory when testing
+          gemspec = if ENV["BUNDLE_RUBY"] && ENV["BUNDLE_GEM"]
+            # for Ruby Core
+            "lib/bundler/bundler.gemspec"
+          else
+            "bundler.gemspec"
+          end
+
+          # avoid stepping above the tmp directory when testing
+          return nil if File.file?(File.join(current, gemspec))
+        end
+
         names.each do |name|
           filename = File.join(current, name)
           yield filename