Rspec matcher for attr_accessor, attr_reader and attr_writer

attribute_spec_helper.rb

# `have_attr_reader` matcher for attr_reader
RSpec::Matchers.define :have_attr_reader do |field|
  match do |object_instance|
    object_instance.respond_to?(field)
  end

  failure_message do |object_instance|
    "expected attr_reader for #{ field } on #{ object_instance }"
  end

  failure_message_when_negated do |object_instance|
    "expected attr_reader for #{ field } not to be defined on #{ object_instance }"
  end

  description do
    'checks to see if there is an attr reader on the instance.'
  end
end

# `have_attr_writer` matcher for attr_writer
RSpec::Matchers.define :have_attr_writer do |field|
  match do |object_instance|
    object_instance.respond_to?("#{ field }=")
  end

  failure_message do |object_instance|
    "expected attr_writer for #{ field } on #{ object_instance }"
  end

  failure_message_when_negated do |object_instance|
    "expected attr_writer for #{ field } not to be defined on #{ object_instance }"
  end

  description do
    'checks to see if there is an attr writer on the instance.'
  end
end

# `have_attr_accessor` matcher for attr_accessor
RSpec::Matchers.define :have_attr_accessor do |field|
  match do |object_instance|
    object_instance.respond_to?(field) && object_instance.respond_to?("#{ field }=")
  end

  failure_message do |object_instance|
    "expected attr_accessor for #{ field } on #{ object_instance }"
  end

  failure_message_when_negated do |object_instance|
    "expected attr_accessor for #{ field } not to be defined on #{ object_instance }"
  end

  description do
    'checks to see if there is an attr accessor on the instance.'
  end
end