TDD sample

age_calc_spec.rb

# -*- coding: utf-8 -*-
require './age_calc'
require 'date'

describe AgeCalc do
  before do
    @age_calc = AgeCalc.new
  end

  it "birthdayで誕生日が設定できること" do
    @age_calc.birthday = Date.new(1989,2,25)
    @age_calc.birthday.should == Date.new(1989,2,25)
  end

  it "ageで年齢が返ること" do
    @age_calc.birthday = Date.new(1989,2,25)
    @age_calc.age.should == 23
  end

  it "birthdayが未設定の場合、ageでnilが返ること" do
    @age_calc.age.should be_nil
  end

  it "birthdayにDate以外の値を設定すると、ageで例外が返ること" do
    @age_calc.birthday = "23 years ago"
    lambda{@age_calc.age}.should raise_error
  end

  it "increment_ageでageが1増えること" do
    @age_calc.birthday = Date.new(1989,2,25)
    lambda {@age_calc.increment_age}.should change(@age_calc, :age).from(23).to(24)
  end
  it "ageが20から30の間にあること" do
    @age_calc.birthday = Date.new(1989,2,25)
    @age_calc.age.should be_close(20,30)
  end
  it "yearsが空になること" do
    @age_calc.years.should be_empty
  end
  it "ageがDateクラスのオブジェクトでないこと" do
    @age_calc.birthday = Date.new(1989,2,25)
    @age_calc.age.should_not be_is_a(Date)
  end
end