Use File.join() where possible

lib/compliance_engine/module_loader.rb

@@ -33,9 +33,9 @@ def initialize(path, fileclass: File, dirclass: Dir)
     # In this directory, we want to look for all yaml and json files
     # under SIMP/compliance_profiles and simp/compliance_profiles.
     globs = ['SIMP/compliance_profiles', 'simp/compliance_profiles']
-            .select { |dir| fileclass.directory?("#{path}/#{dir}") }
+            .select { |dir| fileclass.directory?(File.join(path, dir)) }
             .map { |dir|
-      ['yaml', 'json'].map { |type| "#{path}/#{dir}/**/*.#{type}" }
+      ['yaml', 'json'].map { |type| File.join(path, dir, '**', "*.#{type}") }
     }.flatten
     # debug "Globs: #{globs}"
     # Using .each here to make mocking with rspec easier.