[rubygems/rubygems] Fix error when gem specified twice in gemfile under different platforms

https://github.com/rubygems/rubygems/commit/83bc87ca98

1 files changed, 16 insertions, 0 deletions

diff --git a/spec/bundler/commands/install_spec.rb b/spec/bundler/commands/install_spec.rb
index 918dc28acb..dd4d31a1ad 100644
--- a/spec/bundler/commands/install_spec.rb
+++ b/spec/bundler/commands/install_spec.rb
@@ -391,6 +391,22 @@ RSpec.describe "bundle install with gem sources" do
       expect(err).to include("While it's not a problem now, it could cause errors if you change the version of one of them later.")
     end
 
+    it "throws a warning if a gem is added twice under different platforms and does not crash when using the generated lockfile" do
+      build_repo2
+
+      install_gemfile <<-G
+        source "#{file_uri_for(gem_repo2)}"
+        gem "rack", :platform => :jruby
+        gem "rack"
+      G
+
+      bundle "install"
+
+      expect(err).to include("Your Gemfile lists the gem rack (>= 0) more than once.")
+      expect(err).to include("Remove any duplicate entries and specify the gem only once.")
+      expect(err).to include("While it's not a problem now, it could cause errors if you change the version of one of them later.")
+    end
+
     it "does not throw a warning if a gem is added once in Gemfile and also inside a gemspec as a development dependency" do
       build_lib "my-gem", :path => bundled_app do |s|
         s.add_development_dependency "my-private-gem"