[rubygems/rubygems] Only add .rubocop.yml when --rubocop flag is passed

Signed-off-by: Utkarsh Gupta <utkarsh@debian.org>

https://github.com/rubygems/rubygems/commit/ef2dae4222

lib/bundler/cli/gem.rb

@@ -148,6 +148,7 @@ module Bundler
         "and the Ruby Style Guides (https://github.com/rubocop-hq/ruby-style-guide).")
         config[:rubocop] = true
         Bundler.ui.info "RuboCop enabled in config"
+        templates.merge!("rubocop.yml.tt" => ".rubocop.yml")
       end
 
       templates.merge!("exe/newgem.tt" => "exe/#{name}") if config[:exe]

spec/bundler/commands/newgem_spec.rb

@@ -169,6 +169,10 @@ RSpec.describe "bundle gem" do
       rubocop_dep = builder.dependencies.find {|d| d.name == "rubocop" }
       expect(rubocop_dep).not_to be_nil
     end
+
+    it "generates a default .rubocop.yml" do
+      expect(bundled_app("#{gem_name}/.rubocop.yml")).to exist
+    end
   end
 
   shared_examples_for "--no-rubocop flag" do
@@ -192,6 +196,10 @@ RSpec.describe "bundle gem" do
       rubocop_dep = builder.dependencies.find {|d| d.name == "rubocop" }
       expect(rubocop_dep).to be_nil
     end
+
+    it "doesn't generate a default .rubocop.yml" do
+      expect(bundled_app("#{gem_name}/.rubocop.yml")).to_not exist
+    end
   end
 
   shared_examples_for "CI config is absent" do