Add test coverage of local rgloader creation

lib/vagrant/environment.rb

@@ -910,7 +910,7 @@ module Vagrant
         loader_file = @local_data_path.join("rgloader", "loader.rb")
         if !loader_file.file?
           source_loader = Vagrant.source_root.join("templates/rgloader.rb")
-          FileUtils.mkdir_p(@local_data_path.join("rgloader"))
+          FileUtils.mkdir_p(@local_data_path.join("rgloader").to_s)
           FileUtils.cp(source_loader.to_s, loader_file.to_s)
         end
       rescue Errno::EACCES

test/unit/vagrant/environment_test.rb

@@ -1513,4 +1513,21 @@ VF
       end
     end
   end
+
+  describe "#setup_local_data_path" do
+    before do
+      allow(FileUtils).to receive(:mkdir_p).and_call_original
+      allow(FileUtils).to receive(:cp).and_call_original
+    end
+
+    it "should create an rgloader path" do
+      expect(FileUtils).to receive(:mkdir_p).with(/(?!home)rgloader/)
+      instance
+    end
+
+    it "should write the rgloader file" do
+      expect(FileUtils).to receive(:cp).with(anything, /(?!home)rgloader.*rb$/)
+      instance
+    end
+  end
 end