Implement variable length argument
Add specs for variable length argument
Use shared_examples
Nest describe blocks
Use context instead of describe
Refactoring
Add ng_word accessor
Use predicate matcher
Use rspec-its
Move its-example to shared_example
Add example for ng_words size
Use rspec-collection_matchers
Use rspec-its
Use have(n).named_collection syntax
Add example for 2 ng_words