Bundler fail

cat > Gemfile.gemspec_dependency_error <<GEMFILE
  source 'https://rubygems.org'
  gemspec
GEMFILE

cat > gemspec_dependency_error.gemspec <<SPEC
Gem::Specification.new do |s|
  s.name = "gemspec_dependency_error"
  s.version = "0.0.1"
  s.add_dependency 'rails', ">= 3"
  s.add_dependency "rspec_junit_formatter"
end
SPEC

cat > Gemfile.no_error <<GEMFILE
source 'https://rubygems.org'
gem "rspec_junit_formatter"
gem "rails", ">= 3"
GEMFILE

bundle install --gemfile=Gemfile.gemspec_dependency_error
bundle install --gemfile=Gemfile.no_error