Disable unit test generation

g.test_framework = :testunit (or test_unit) does not work
out of the box.

https://stackoverflow.com/questions/12148611/rails-generators-not-
generating-the-proper-test-templates

config/application.rb

@@ -60,7 +60,7 @@ module Registry
       g.helper false
       g.template_engine :erb
       g.jbuilder false
-      g.test_framework :minitest, fixture: false
+      g.test_framework nil
     end
 
     registrant_portal_uri = URI.parse(ENV['registrant_url'])