[rubygems/rubygems] Implement Bundler::SourceList#implicit_global_source?

This method is created to tell whether any global source exist in the object or not and it will be used by `Bundler:Dsl` to print a warning if no global source has been defined in the Gemfile.

https://github.com/rubygems/rubygems/commit/422fec4438

1 files changed, 15 insertions, 0 deletions

diff --git a/spec/bundler/bundler/source_list_spec.rb b/spec/bundler/bundler/source_list_spec.rb
index c2d1978b29..f860e9ff58 100644
--- a/spec/bundler/bundler/source_list_spec.rb
+++ b/spec/bundler/bundler/source_list_spec.rb
@@ -441,4 +441,19 @@ RSpec.describe Bundler::SourceList do
       source_list.remote!
     end
   end
+
+  describe "implicit_global_source?" do
+    context "when a global rubygem source provided" do
+      it "returns a falsy value" do
+        source_list.add_global_rubygems_remote("https://rubygems.org")
+
+        expect(source_list.implicit_global_source?).to be_falsey
+      end
+    end
+    context "when no global rubygem source provided" do
+      it "returns a truthy value" do
+        expect(source_list.implicit_global_source?).to be_truthy
+      end
+    end
+  end
 end