[rubygems/rubygems] Fix funding metadata not being printed in some situations

Namely, when a gem has not previously been installed, and Bundler is
using the compact index API, fund metadata was not getting printed
because the proper delegation was not implemented in the specification
class used by the compact index.

https://github.com/rubygems/rubygems/commit/9ef5139f60

lib/bundler/endpoint_specification.rb

@@ -92,6 +92,17 @@ module Bundler
       end
     end
 
+    # needed for `bundle fund`
+    def metadata
+      if @remote_specification
+        @remote_specification.metadata
+      elsif _local_specification
+        _local_specification.metadata
+      else
+        super
+      end
+    end
+
     def _local_specification
       return unless @loaded_from && File.exist?(local_specification_path)
       eval(File.read(local_specification_path), nil, local_specification_path).tap do |spec|

spec/bundler/install/gems/fund_spec.rb

@@ -31,8 +31,8 @@ RSpec.describe "bundle install" do
 
     context "when gems include a fund URI" do
       it "displays the plural fund message after installing" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo2)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo2"
           gem 'has_funding_and_other_metadata'
           gem 'has_funding'
           gem 'rack-obama'
@@ -42,8 +42,8 @@ RSpec.describe "bundle install" do
       end
 
       it "displays the singular fund message after installing" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo2)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo2"
           gem 'has_funding'
           gem 'rack-obama'
         G
@@ -58,8 +58,8 @@ RSpec.describe "bundle install" do
       end
 
       it "does not display the plural fund message after installing" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo2)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo2"
           gem 'has_funding_and_other_metadata'
           gem 'has_funding'
           gem 'rack-obama'
@@ -69,8 +69,8 @@ RSpec.describe "bundle install" do
       end
 
       it "does not display the singular fund message after installing" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo2)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo2"
           gem 'has_funding'
           gem 'rack-obama'
         G
@@ -81,8 +81,8 @@ RSpec.describe "bundle install" do
 
     context "when gems do not include fund messages" do
       it "does not display any fund messages" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo2)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo2"
           gem "activesupport"
         G
 
@@ -92,8 +92,8 @@ RSpec.describe "bundle install" do
 
     context "when a dependency includes a fund message" do
       it "does not display the fund message" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo2)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo2"
           gem 'gem_with_dependent_funding'
         G
 
@@ -110,8 +110,8 @@ RSpec.describe "bundle install" do
             "funding_uri" => "https://example.com/also_has_funding/funding",
           }
         end
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo1)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo1"
           gem 'also_has_funding', :git => '#{lib_path("also_has_funding-1.0")}'
         G
 
@@ -124,8 +124,8 @@ RSpec.describe "bundle install" do
             "funding_uri" => "https://example.com/also_has_funding/funding",
           }
         end
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo1)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo1"
           gem 'also_has_funding', :git => '#{lib_path("also_has_funding-1.0")}'
         G
 
@@ -134,8 +134,8 @@ RSpec.describe "bundle install" do
             "funding_uri" => "https://example.com/also_has_funding/funding",
           }
         end
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo1)}"
+        install_gemfile <<-G, artifice: "compact_index"
+          source "https://gem.repo1"
           gem 'also_has_funding', :git => '#{lib_path("also_has_funding-1.1")}'
         G
 
@@ -149,14 +149,14 @@ RSpec.describe "bundle install" do
           }
         end
         gemfile <<-G
-          source "#{file_uri_for(gem_repo1)}"
+          source "https://gem.repo1"
           gem 'also_has_funding', :git => '#{lib_path("also_has_funding-1.0")}'
         G
 
-        bundle :install
+        bundle :install, artifice: "compact_index"
         expect(out).to include("1 installed gem you directly depend on is looking for funding.")
 
-        bundle :install
+        bundle :install, artifice: "compact_index"
         expect(out).to include("1 installed gem you directly depend on is looking for funding.")
       end
     end