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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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