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|
# frozen_string_literal: true
require "spec/spec_helper"
RSpec.describe Equatable, "#include" do
let(:name) { "Value" }
let(:object) { described_class }
context "without attributes" do
let(:klass) { ::Class.new }
subject { klass.new }
before {
allow(klass).to receive(:name).and_return(name)
klass.send(:include, object)
}
it { is_expected.to respond_to(:compare?) }
it { is_expected.to be_instance_of(klass) }
it "has no attribute names" do
expect(klass.comparison_attrs).to eq([])
end
describe "#inspect" do
it { expect(subject.inspect).to eql("#<Value>") }
end
describe "#hash" do
it { expect(subject.hash).to eql([klass].hash) }
end
describe "#eql?" do
context "when objects are similar" do
let(:other) { subject.dup }
it { expect(subject.eql?(other)).to eql(true) }
end
context "when objects are different" do
let(:other) { double("other") }
it { expect(subject.eql?(other)).to eql(false) }
end
end
describe "#==" do
context "when objects are similar" do
let(:other) { subject.dup }
it { expect(subject == other).to eql(true) }
end
context "when objects are different" do
let(:other) { double("other") }
it { expect(subject == other).to eql(false) }
end
end
context "equivalence relation" do
let(:other) { subject.dup }
let(:another) { other.dup }
it "is not equal to nil reference" do
expect(subject.eql?(nil)).to eql(false)
end
it "is reflexive" do
expect(subject.eql?(subject)).to eql(true)
end
it "is symmetric" do
expect(subject.eql?(other)).to eql(other.eql?(subject))
end
it "is transitive" do
expect(subject.eql?(other) && other.eql?(another))
.to eql(subject.eql?(another))
end
end
end
context "with attributes" do
let(:value) { 11 }
let(:klass) {
::Class.new do
include Equatable
attr_reader :value
def initialize(value)
@value = value
end
end
}
before { allow(klass).to receive(:name).and_return(name) }
subject { klass.new(value) }
it "dynamically defines #hash method" do
expect(klass.method_defined?(:hash)).to eql(true)
end
it "dynamically defines #inspect method" do
expect(klass.method_defined?(:inspect)).to eql(true)
end
it { is_expected.to respond_to(:compare?) }
it { is_expected.to respond_to(:eql?) }
it "has comparison attribute names" do
expect(klass.comparison_attrs).to eq([:value])
end
describe "#eql?" do
context "when objects are similar" do
let(:other) { subject.dup }
it { expect(subject.eql?(other)).to eql(true) }
end
context "when objects are different" do
let(:other) { double("other") }
it { expect(subject.eql?(other)).to eql(false) }
end
end
describe "#==" do
context "when objects are similar" do
let(:other) { subject.dup }
it { expect(subject == other).to eql(true) }
end
context "when objects are different" do
let(:other) { double("other") }
it { expect(subject == other).to eql(false) }
end
end
describe "#inspect" do
it { expect(subject.inspect).to eql("#<Value value=11>") }
end
describe "#hash" do
it { expect(subject.hash).to eql(([klass] + [value]).hash) }
end
context "equivalence relation" do
let(:other) { subject.dup }
let(:another) { other.dup }
it "is not equal to nil reference" do
expect(subject.eql?(nil)).to eql(false)
end
it "is reflexive" do
expect(subject.eql?(subject)).to eql(true)
end
it "is symmetric" do
expect(subject.eql?(other)).to eql(other.eql?(subject))
end
it "is transitive" do
expect(subject.eql?(other) && other.eql?(another))
.to eql(subject.eql?(another))
end
end
end
end
|
