【RSpec】described_classの小さなサンプルメモ

サンプルクラス

person.rb

class Person
  attr_accessor :name
  def initialize
    @name = "kure"
  end
end

class Person2
  attr_accessor :name
  def initialize
    @name = "kure2"
  end
end

サンプルRSpec

require 'person'

RSpec.describe Person do

  subject(:kure){ Person.new }
  # ★described_class で describeで宣言されたクラス（=Person）を取ってくる
  subject(:kure_by_described_class){ described_class.new }
  subject{ Person2.new }

  # オーソドックスな書き方
  it "name is kure" do
    person = Person.new
    expect(person.name).to eq("kure")
  end

  it "name is kure(described_class)" do
    expect(kure_by_described_class.name).to eq("kure")
  end

  it "name is kure(subject)" do
    expect(kure.name).to eq("kure")
  end

  it "name is kure2(subject)" do
    expect(subject.name).to eq("kure2")
  end
end