[rubygems/rubygems] Extract a `next_ruby_minor` helper method for specs

https://github.com/rubygems/rubygems/commit/66eae0ef1d

spec/bundler/commands/lock_spec.rb

@@ -493,27 +493,25 @@ RSpec.describe "bundle lock" do
   end
 
   it "does not conflict on ruby requirements when adding new platforms" do
-    next_minor = Gem.ruby_version.segments[0..1].map.with_index {|s, i| i == 1 ? s + 1 : s }.join(".")
-
     build_repo4 do
       build_gem "raygun-apm", "1.0.78" do |s|
         s.platform = "x86_64-linux"
-        s.required_ruby_version = "< #{next_minor}.dev"
+        s.required_ruby_version = "< #{next_ruby_minor}.dev"
       end
 
       build_gem "raygun-apm", "1.0.78" do |s|
         s.platform = "universal-darwin"
-        s.required_ruby_version = "< #{next_minor}.dev"
+        s.required_ruby_version = "< #{next_ruby_minor}.dev"
       end
 
       build_gem "raygun-apm", "1.0.78" do |s|
         s.platform = "x64-mingw32"
-        s.required_ruby_version = "< #{next_minor}.dev"
+        s.required_ruby_version = "< #{next_ruby_minor}.dev"
       end
 
       build_gem "raygun-apm", "1.0.78" do |s|
         s.platform = "x64-mingw-ucrt"
-        s.required_ruby_version = "< #{next_minor}.dev"
+        s.required_ruby_version = "< #{next_ruby_minor}.dev"
       end
     end
 

spec/bundler/support/helpers.rb

@@ -471,6 +471,10 @@ module Spec
       end
     end
 
+    def next_ruby_minor
+      Gem.ruby_version.segments[0..1].map.with_index {|s, i| i == 1 ? s + 1 : s }.join(".")
+    end
+
     # versions providing a bundler version finder but not including
     # https://github.com/rubygems/rubygems/commit/929e92d752baad3a08f3ac92eaec162cb96aedd1
     def rubygems_version_failing_to_activate_bundler_prereleases