[rubygems/rubygems] Introduce Spec::Path.sinatra_dependency_paths for sinatra mock server

https://github.com/rubygems/rubygems/commit/0a168156d5

spec/bundler/support/artifice/endpoint_500.rb

@@ -2,7 +2,7 @@
 
 require_relative "../path"
 
-$LOAD_PATH.unshift(*Dir[Spec::Path.base_system_gem_path.join("gems/{mustermann,rack,tilt,sinatra,ruby2_keywords,base64,logger}-*/lib")].map(&:to_s))
+$LOAD_PATH.unshift(*Spec::Path.sinatra_dependency_paths)
 
 require "sinatra/base"
 

spec/bundler/support/artifice/helpers/endpoint.rb

@@ -2,7 +2,7 @@
 
 require_relative "../../path"
 
-$LOAD_PATH.unshift(*Dir[Spec::Path.base_system_gem_path.join("gems/{mustermann,rack,tilt,sinatra,ruby2_keywords,base64,logger}-*/lib")].map(&:to_s))
+$LOAD_PATH.unshift(*Spec::Path.sinatra_dependency_paths)
 
 require "sinatra/base"
 

spec/bundler/support/artifice/windows.rb

@@ -2,7 +2,7 @@
 
 require_relative "../path"
 
-$LOAD_PATH.unshift(*Dir[Spec::Path.base_system_gem_path.join("gems/{mustermann,rack,tilt,sinatra,ruby2_keywords,base64,logger}-*/lib")].map(&:to_s))
+$LOAD_PATH.unshift(*Spec::Path.sinatra_dependency_paths)
 
 require "sinatra/base"
 

spec/bundler/support/path.rb

@@ -280,6 +280,19 @@ module Spec
       Dir["#{base_system_gems}/#{Bundler.ruby_scope}/**/rake*.gem"].first
     end
 
+    def sinatra_dependency_paths
+      deps = %w[
+        mustermann
+        rack
+        tilt
+        sinatra
+        ruby2_keywords
+        base64
+        logger
+      ]
+      Dir[base_system_gem_path.join("gems/{#{deps.join(",")}}-*/lib")].map(&:to_s)
+    end
+
     private
 
     def git_ls_files(glob)