post_controller_test.rb

require 'test_helper'

class PostsControllerTest < ActionDispatch::IntegrationTest
  test '#index returns a list of all available posts' do
    get posts_path

    assert_response :success
  end

  test '#new returns a posts form' do
    get new_post_path

    assert_response :success
  end

  test '#create stores a post record' do
    post posts_path, params: { post: { title: 'My post', content: 'Lorem impsum' } }

    assert_redirected_to posts_path
    assert_equal 'Post created!', flash[:notice]
  end

  test '#show returns a post' do
    post = Post.create(title: 'My post', content: 'Lorm impsum')

    get post_path(post)

    assert_response :success
  end

  test '#edit returns a form for given post' do
    post = Post.create(title: 'My post', content: 'Lorm impsum')

    get edit_post_path(post)

    assert_response :success
  end

  test '#update changes attribute to given post' do
    post = Post.create(title: 'My post', content: 'Lorm impsum')

    patch post_path(post), params: { post: { title: 'Updated poast' } }

    assert_redirected_to posts_path
    assert_equal 'Post updated!', flash[:notice]
  end

  test '#destroy gets rid of given post' do
    post = Post.create(title: 'My post', content: 'Lorm impsum')

    delete post_path(post)

    assert_redirected_to posts_path
    assert_equal 'Post deleted!', flash[:notice]
  end
end