rails generate rspec:install
bundle binstub rspec-core
bin/rspec
rails generate model user username:string
bin/rake db:migrate RAILS_ENV=test
bin/rspec

Pending:
  User add some examples to (or delete) /Users/ming/src/rails/rspec-rails-app/spec/models/user_spec.rb
    # Not yet implemented
    # ./spec/models/user_spec.rb:4

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1 example, 0 failures, 1 pending