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# frozen_string_literal: true
require "spec/spec_helper"
RSpec.describe Equatable, '#==' do
let(:name) { 'Value' }
let(:value) { 11 }
let(:super_klass) {
::Class.new do
include Equatable
attr_reader :value
def initialize(value)
@value = value
end
end
}
let(:klass) { Class.new(super_klass) }
let(:object) { klass.new(value) }
subject { object == other }
context 'with the same object' do
let(:other) { object }
it { is_expected.to eql(true) }
it 'is symmetric' do
is_expected.to eql(other == object)
end
end
context 'with an equivalent object' do
let(:other) { object.dup }
it { is_expected.to eql(true) }
it 'is symmetric' do
is_expected.to eql(other == object)
end
end
context 'with an equivalent object of a subclass' do
let(:other) { ::Class.new(klass).new(value) }
it { is_expected.to eql(true) }
it 'is not symmetric' do
# LSP, any equality for type should work for subtype but
# not the other way
is_expected.not_to eql(other == object)
end
end
context 'with an equivalent object of a superclass' do
let(:other) { super_klass.new(value) }
it { is_expected.to eql(false) }
it 'is not symmetric' do
is_expected.not_to eql(other == object)
end
end
context 'with an object with a different interface' do
let(:other) { Object.new }
it { is_expected.to eql(false) }
end
context 'with an object of another class' do
let(:other) { Class.new.new }
it { is_expected.to eql(false) }
it 'is symmetric' do
is_expected.to eql(other == object)
end
end
end
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