comment_test.rb

require 'test_helper'

class CommentTest < ActiveSupport::TestCase
  test 'it is not valid without a post' do
    comment = Comment.new

    refute comment.valid?
    assert_equal ['must exist'], comment.errors.messages[:post]
  end

  test 'it is not valid without content' do
    comment = Comment.new

    refute comment.valid?
    assert_equal ["can't be blank"], comment.errors.messages[:content]
  end

  test 'it is valid with a post and content' do
    post = Post.new(title: 'My post', content: 'My new blog post')
    comment = Comment.new(post: post, content: 'Nice post!')

    assert comment.valid?
  end
end