twitter-status-bot/.gems/gems/naught-1.0.0/spec/mimic_spec.rb

118 lines
2.6 KiB
Ruby

require 'spec_helper'
require 'logger'
describe 'null object mimicking a class' do
class User
def login
'bob'
end
end
module Authorizable
def authorized_for?(object)
true
end
end
class LibraryPatron < User
include Authorizable
def member?
true
end
def name
'Bob'
end
def notify_of_overdue_books(titles)
puts 'Notifying...'
end
end
subject(:null) { mimic_class.new }
let(:mimic_class) do
Naught.build do |b|
b.mimic LibraryPatron
end
end
it 'responds to all methods defined on the target class' do
expect(null.member?).to be_nil
expect(null.name).to be_nil
expect(null.notify_of_overdue_books(['The Grapes of Wrath'])).to be_nil
end
it 'does not respond to methods not defined on the target class' do
expect { null.foobar }.to raise_error(NoMethodError)
end
it 'reports which messages it does and does not respond to' do
expect(null).to respond_to(:member?)
expect(null).to respond_to(:name)
expect(null).to respond_to(:notify_of_overdue_books)
expect(null).not_to respond_to(:foobar)
end
it 'has an informative inspect string' do
expect(null.inspect).to eq('<null:LibraryPatron>')
end
it 'excludes Object methods from being mimicked' do
expect(null.object_id).not_to be_nil
expect(null.hash).not_to be_nil
end
it 'includes inherited methods' do
expect(null.authorized_for?('something')).to be_nil
expect(null.login).to be_nil
end
describe 'with include_super: false' do
let(:mimic_class) do
Naught.build do |b|
b.mimic LibraryPatron, :include_super => false
end
end
it 'excludes inherited methods' do
expect(null).to_not respond_to(:authorized_for?)
expect(null).to_not respond_to(:login)
end
end
end
describe 'using mimic with black_hole' do
subject(:null) { mimic_class.new }
let(:mimic_class) do
Naught.build do |b|
b.mimic Logger
b.black_hole
end
end
def self.it_behaves_like_a_black_hole_mimic
it 'returns self from mimicked methods' do
expect(null.info).to equal(null)
expect(null.error).to equal(null)
expect(null << 'test').to equal(null)
end
it 'does not respond to methods not defined on the target class' do
expect { null.foobar }.to raise_error(NoMethodError)
end
end
it_behaves_like_a_black_hole_mimic
describe '(reverse order)' do
let(:mimic_class) do
Naught.build do |b|
b.black_hole
b.mimic Logger
end
end
it_behaves_like_a_black_hole_mimic
end
end