ensure_inclusion_of_spec.rb

ensure_inclusion_of_spec.rb

require 'rspec'
require 'rails'
require 'shoulda-matchers'


CORRECT_ARRAY = %w(one two three)

WRONG_ARRAY = %w(wrong array)

class Nothing
  include ActiveModel::Validations
  attr_accessor :array_to_test
end


class Something
  include ActiveModel::Validations
  attr_accessor :array_to_test
  validates :array_to_test, :inclusion => { :in => CORRECT_ARRAY }
end

describe Nothing do
  it { should_not ensure_inclusion_of(:array_to_test).in_array(CORRECT_ARRAY) } #=> this should pass. There is no validation.
  it { should_not ensure_inclusion_of(:array_to_test).in_array(WRONG_ARRAY) } #=> this should pass. There is no validation.
end

describe Something do
  it { should ensure_inclusion_of(:array_to_test).in_array(CORRECT_ARRAY) } #=> this does pass. but will not fail if validation is removed. 
  it { should_not ensure_inclusion_of(:array_to_test).in_array(WRONG_ARRAY) } #=> this does pass, but only verifies a small subset of invalid values. 
end

# $ bundle exec rspec ensure_inclusion_spec.rb 
# 
# Nothing
#   should not ensure inclusion of array_to_test in ["one", "two", "three"] (FAILED - 1)
#   should not ensure inclusion of array_to_test in ["wrong", "array"] (FAILED - 2)
# 
# Something
#   should ensure inclusion of array_to_test in ["one", "two", "three"]
#   should not ensure inclusion of array_to_test in ["wrong", "array"]
# 
# Failures:
# 
#   1) Nothing 
#      Failure/Error: it { should_not ensure_inclusion_of(:array_to_test).in_array(CORRECT_ARRAY) } #=> this should pass. There is no validation.
#        Did not expect errors  when array_to_test is set to "three", got error: 
#      # ./test_spec.rb:23:in `block (2 levels) in <top (required)>'
# 
#   2) Nothing 
#      Failure/Error: it { should_not ensure_inclusion_of(:array_to_test).in_array(WRONG_ARRAY) } #=> this should pass. There is no validation.
#        Did not expect errors  when array_to_test is set to "array", got error: 
#      # ./test_spec.rb:24:in `block (2 levels) in <top (required)>'
# 
# Finished in 0.09288 seconds
# 4 examples, 2 failures
# 
# Failed examples:
# 
# rspec ./test_spec.rb:23 # Nothing 
# rspec ./test_spec.rb:24 # Nothing