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# encoding: utf-8
require 'spec_helper'
describe Equalizer, '.new' do
let(:object) { described_class }
let(:name) { 'User' }
let(:klass) { ::Class.new }
context 'with no keys' do
subject { object.new }
before do
# specify the class #name method
allow(klass).to receive(:name).and_return(name)
klass.send(:include, subject)
end
let(:instance) { klass.new }
it { should be_instance_of(object) }
it { should be_frozen }
it 'defines #hash and #inspect methods dynamically' do
expect(subject.public_instance_methods(false).map(&:to_s).sort)
.to eql(%w[hash inspect])
end
describe '#eql?' do
context 'when the objects are similar' do
let(:other) { instance.dup }
it { expect(instance.eql?(other)).to be(true) }
end
context 'when the objects are different' do
let(:other) { double('other') }
it { expect(instance.eql?(other)).to be(false) }
end
end
describe '#==' do
context 'when the objects are similar' do
let(:other) { instance.dup }
it { expect(instance == other).to be(true) }
end
context 'when the objects are different' do
let(:other) { double('other') }
it { expect(instance == other).to be(false) }
end
end
describe '#hash' do
it 'has the expected arity' do
expect(klass.instance_method(:hash).arity).to be(0)
end
it { expect(instance.hash).to eql([klass].hash) }
end
describe '#inspect' do
it 'has the expected arity' do
expect(klass.instance_method(:inspect).arity).to be(0)
end
it { expect(instance.inspect).to eql('#<User>') }
end
end
context 'with keys' do
subject { object.new(*keys) }
let(:keys) { %i[firstname lastname].freeze }
let(:firstname) { 'John' }
let(:lastname) { 'Doe' }
let(:instance) { klass.new(firstname, lastname) }
let(:klass) do
::Class.new do
attr_reader :firstname, :lastname
private :firstname, :lastname
def initialize(firstname, lastname)
@firstname, @lastname = firstname, lastname
end
end
end
before do
# specify the class #inspect method
allow(klass).to receive_messages(name: nil, inspect: name)
klass.send(:include, subject)
end
it { should be_instance_of(object) }
it { should be_frozen }
it 'defines #hash and #inspect methods dynamically' do
expect(subject.public_instance_methods(false).map(&:to_s).sort)
.to eql(%w[hash inspect])
end
describe '#eql?' do
context 'when the objects are similar' do
let(:other) { instance.dup }
it { expect(instance.eql?(other)).to be(true) }
end
context 'when the objects are different' do
let(:other) { double('other') }
it { expect(instance.eql?(other)).to be(false) }
end
end
describe '#==' do
context 'when the objects are similar' do
let(:other) { instance.dup }
it { expect(instance == other).to be(true) }
end
context 'when the objects are different type' do
let(:other) { klass.new('Foo', 'Bar') }
it { expect(instance == other).to be(false) }
end
context 'when the objects are from different type' do
let(:other) { double('other') }
it { expect(instance == other).to be(false) }
end
end
describe '#hash' do
it 'returns the expected hash' do
expect(instance.hash)
.to eql([firstname, lastname, klass].hash)
end
end
describe '#inspect' do
it 'returns the expected string' do
expect(instance.inspect)
.to eql('#<User firstname="John" lastname="Doe">')
end
end
end
end
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