Test ActiveRecord #delete vs #destroy

post.rb

class Post < ActiveRecord::Base
  before_destroy :protect_from_destruction

  def protect_from_destruction
    if protected?
      errors.add(:base, "Whoa this one is important") 
      false
    end
  end

  def protected?
    true
  end
end

post_test.rb

require 'test_helper'

class PostTest < ActiveSupport::TestCase
  test "using delete deletes objects despite callbacks" do
    post = Post.create
    post.delete
    assert_equal Post.first, nil
  end

  test "using destroy respects callback" do
    post = Post.create
    post.destroy
    assert_equal post.errors[:base][0], "Whoa this one is important"
    assert_equal post, Post.first
  end
end