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If you have any problem with gem shoulda-matcher after installation and start of gem Zeus, do not just roll back the entire development and say goodbye to Zeus.
Try the following:

In Gemfile:

gem 'shoulda-matchers', require: false

In file spec/rails_helper.rb if presents, or in spec/spec_helper.rb:

require 'rspec/rails'
require 'shoulda/matchers'

It should work. Good luck!