[rubygems/rubygems] Only validate resolution info in Bundler

This commit switches out the full gemspec validation for a partial one
which only performs resolution related checks. This will allow gem
authors to run `bundle` commands immediately after creating a new gem
with Bundler, rather than having to fix metadata validation issues in
the default gemspec.

https://github.com/rubygems/rubygems/commit/d5aa9cae9d

lib/bundler/rubygems_integration.rb

@@ -52,7 +52,7 @@ module Bundler
     end
 
     def validate(spec)
-      Bundler.ui.silence { spec.validate(false) }
+      Bundler.ui.silence { spec.validate_for_resolution }
     rescue Gem::InvalidSpecificationException => e
       error_message = "The gemspec at #{spec.loaded_from} is not valid. Please fix this gemspec.\n" \
         "The validation error was '#{e.message}'\n"

spec/bundler/bundler/rubygems_integration_spec.rb

@@ -11,14 +11,14 @@ RSpec.describe Bundler::RubygemsIntegration do
     end
     subject { Bundler.rubygems.validate(spec) }
 
-    it "validates with packaging mode disabled" do
-      expect(spec).to receive(:validate).with(false)
+    it "validates for resolution" do
+      expect(spec).to receive(:validate_for_resolution)
       subject
     end
 
     context "with an invalid spec" do
       before do
-        expect(spec).to receive(:validate).with(false).
+        expect(spec).to receive(:validate_for_resolution).
           and_raise(Gem::InvalidSpecificationException.new("TODO is not an author"))
       end
 

spec/bundler/commands/exec_spec.rb

@@ -674,6 +674,7 @@ RSpec.describe "bundle exec" do
             s.version = '1.0'
             s.summary = 'TODO: Add summary'
             s.authors = 'Me'
+            s.rubygems_version = nil
           end
         G
       end
@@ -686,7 +687,7 @@ RSpec.describe "bundle exec" do
       bundle "exec irb", raise_on_error: false
 
       expect(err).to match("The gemspec at #{lib_path("foo-1.0").join("foo.gemspec")} is not valid")
-      expect(err).to match('"TODO" is not a summary')
+      expect(err).to match(/missing value for attribute rubygems_version|rubygems_version must not be nil/)
     end
   end