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# encoding: utf-8
require 'spec_helper'
describe Equalizer::Methods, '#==' do
subject { object == other }
let(:object) { described_class.new(true) }
let(:described_class) { Class.new(super_class) }
let(:super_class) do
Class.new do
include Equalizer::Methods
attr_reader :boolean
def initialize(boolean)
@boolean = boolean
end
def cmp?(comparator, other)
boolean.send(comparator, other.boolean)
end
end
end
context 'with the same object' do
let(:other) { object }
it { should be(true) }
it 'is symmetric' do
should eql(other == object)
end
end
context 'with an equivalent object' do
let(:other) { object.dup }
it { should be(true) }
it 'is symmetric' do
should eql(other == object)
end
end
context 'with a subclass instance having equivalent obervable state' do
let(:other) { Class.new(described_class).new(true) }
it { should be(true) }
it 'is not symmetric' do
# the subclass instance should maintain substitutability with the object
# (in the LSP sense) the reverse is not true.
should_not eql(other == object)
end
end
context 'with a superclass instance having equivalent observable state' do
let(:other) { super_class.new(true) }
it { should be(false) }
it 'is not symmetric' do
should_not eql(other == object)
end
end
context 'with an object of another class' do
let(:other) { Class.new.new }
it { should be(false) }
it 'is symmetric' do
should eql(other == object)
end
end
context 'with an equivalent object after coercion' do
let(:other) { Object.new }
before do
# declare a private #coerce method
described_class.class_eval do
def coerce(other)
[self.class.new(![nil, false].include?(other)), self]
end
private :coerce
end
end
it { should be(true) }
it 'is not symmetric' do
should_not eql(other == object)
end
end
context 'with a different object after coercion' do
let(:other) { nil }
before do
# declare a private #coerce method
described_class.class_eval do
def coerce(other)
[self.class.new(![nil, false].include?(other)), self]
end
private :coerce
end
end
it { should be(false) }
it 'is symmetric' do
should eql(other == object)
end
end
context 'with a different object' do
let(:other) { described_class.new(false) }
it { should be(false) }
it 'is symmetric' do
should eql(other == object)
end
end
end
|
