comments_controller_test.rb

require 'test_helper'

class CommentsControllerTest < ActionDispatch::IntegrationTest
  test '#create stores a comment for a given post' do
    my_post = Post.create(title: 'My post', content: 'My new blog post')

    post post_comments_path(my_post), params: { comment: { content: 'Nice post!' } }

    assert_redirected_to post_path(my_post)
    assert_equal 'Comment created!', flash[:notice]
  end
end