has_many dependent spec

active_record_base_spec.rb

# File: spec/models/base_spec.rb

require 'rails_helper'

RSpec.describe 'All ActiveRecord::Base models' do
  context 'has_many with :dependent key' do
    each_active_record_model do |model|
      has_many_relations(model).each do |has_many_relation|
        it "has :dependent defined on the #{model}##{has_many_relation.name} relation" do
          expect(has_many_relation.options[:dependent]).not_to be_nil
        end
      end
    end
  end
end

active_record_helper.rb

# File: spec/support/active_record_helper.rb

# Yields a block for each of our defined
# active record models
def each_active_record_model(&block)
  # eagerly require all the models in order to have them all available
  Dir["#{Rails.root}/app/models/**/*.rb"].each { |file| require file }

  ActiveRecord::Base.subclasses
    .reject { |type| type.to_s.include? '::' } # subclassed classes are not our own models
    .each(&block)
end

# Returns all `has_many` relations of the model, excluding
# the `has_many :through` ones.
def has_many_relations(model)
  model
    .reflect_on_all_associations(:has_many)
    .reject { |relation| relation.options[:through] }
end

output

# Console output of `rspec spec/models/base_spec.rb --format d`

All ActiveRecord::Base models
  has_many with :dependent key
    has :dependent defined on the User#comments relation
    has :dependent defined on the User#articles relation
    has :dependent defined on the User#likes relation
    has :dependent defined on the User#votes relation (FAILED - 1)

Failures:

  1) All ActiveRecord::Base models has_many with :dependent key has :dependent defined on the User#votes relation
     Failure/Error: expect(has_many_relation.options[:dependent]).not_to be_nil
     
       expected: not nil
            got: nil
     # ./spec/models/base_spec.rb:8:in `block (5 levels) in <top (required)>'
     # ./spec/rails_helper.rb:61:in `block (3 levels) in <top (required)>'
     # ./spec/rails_helper.rb:60:in `block (2 levels) in <top (required)>'

rails_helper.rb

# File: spec/rails_helper.rb

# ...

Dir[Rails.root.join('spec/support/**/*.rb')].each { |f| require f }

# ...