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֦অ

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Prathamesh Sonpatki @_cha1tanya

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Pune, India

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@deccanrubyconf

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papercall.io/ deccanrubyconf-2016

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deccanrubyconf.com

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Rails issues team

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CodeTriage.com

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Stickers collector

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Stickers

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Do you have stickers?

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T-Shirts are fine too

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I have something!

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Do you have a favourite Open source maintainer?

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Say Thanks!

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@Schneems

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Secrets of Testing Rails 5 apps

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Delete tests

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Delete tests

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Secrets of Testing Rails 5 apps

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Running tests

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rake test Rails 4

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Test output matters!

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Test output matters!

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Test output matters!

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$ be rake test test/controllers/users_controller_test.rb Run options: --seed 8322 1) Failure: UsersControllerTest#test_contact_info_successfully_renders_page [railsconf_talk/test/controllers/users_controller_test.rb:9]: # didn't change by 1. Expected: 20 Actual: 19 Rails 4

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$ be rake test test/controllers/users_controller_test.rb Run options: --seed 8322 1) Failure: UsersControllerTest#test_contact_info_successfully_renders_page [railsconf_talk/test/controllers/users_controller_test.rb:9]: # didn't change by 1. Expected: 20 Actual: 19 Rails 4

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$ be rake test test/controllers/users_controller_test.rb:9 Rails 4

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$ be rake test test/controllers/users_controller_test.rb:9 rake aborted! Don't know how to build task 'test/controllers/ users_controller_test.rb:9' (See full trace by running task with --trace) Rails 4

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Show me what failed?

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Show me quickly!

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Which tests were slow?

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But it’s possible

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Because minitest!

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Discoverability ?

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Documentation ?

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$ bin/rake -T test rake test # Runs all tests in test folder rake test:all # Run tests quickly by merging all types and not resetting db rake test:all:db # Run tests quickly, but also reset db rake test:db # Run tests quickly, but also reset db Rails 4

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$ rails Usage: rails COMMAND [ARGS] The most common rails commands are: generate Generate new code (short-cut alias: "g") console Start the Rails console (short-cut alias: "c") server Start the Rails server (short-cut alias: "s") dbconsole Start a console for the database specified in config/database.yml (short-cut alias: "db") new Create a new Rails application. "rails new my_app" creates a new application called MyApp in "./my_app" In addition to those, there are: destroy Undo code generated with "generate" (short-cut alias: "d") plugin new Generates skeleton for developing a Rails plugin runner Run a piece of code in the application environment (short-cut alias: "r") All commands can be run with -h (or --help) for more information. Rails 4

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Many libraries trying to solve same problem

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Let’s make runing tests in Rails great again

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https://github.com/rails/rails/pull/18596

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Test Runner

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bin/rails test Rails 5

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$ bin/rails test Run options: --seed 34502 # Running: ....... Finished in 2.437723s, 2.8715 runs/s, 4.9226 assertions/s. 7 runs, 12 assertions, 0 failures, 0 errors, 0 skips Rails 5

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Documentation

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$ bin/rails t -h minitest options: -h, --help Display this help. -s, --seed SEED Sets random seed. Also via env. Eg: SEED=n rake -v, --verbose Verbose. Show progress processing files. -n, --name PATTERN Filter run on /regexp/ or string. Known extensions: rails, pride Usage: bin/rails test [options] [files or directories] You can run a single test by appending a line number to a filename: bin/rails test test/models/user_test.rb:27 You can run multiple files and directories at the same time: bin/rails test test/controllers test/integration/login_test.rb By default test failures and errors are reported inline during a run. Rails options: -e, --environment ENV Run tests in the ENV environment -b, --backtrace Show the complete backtrace -d, --defer-output Output test failures and errors after the test run -f, --fail-fast Abort test run on first failure or error -c, --[no-]color Enable color in the output Rails 5

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$ bin/rails t -h minitest options: -h, --help Display this help. -s, --seed SEED Sets random seed. Also via env. Eg: SEED=n rake -v, --verbose Verbose. Show progress processing files. -n, --name PATTERN Filter run on /regexp/ or string. Known extensions: rails, pride Usage: bin/rails test [options] [files or directories] You can run a single test by appending a line number to a filename: bin/rails test test/models/user_test.rb:27 You can run multiple files and directories at the same time: bin/rails test test/controllers test/integration/login_test.rb By default test failures and errors are reported inline during a run. Rails options: -e, --environment ENV Run tests in the ENV environment -b, --backtrace Show the complete backtrace -d, --defer-output Output test failures and errors after the test run -f, --fail-fast Abort test run on first failure or error -c, --[no-]color Enable color in the output Rails 5

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$ bin/rails t -h minitest options: -h, --help Display this help. -s, --seed SEED Sets random seed. Also via env. Eg: SEED=n rake -v, --verbose Verbose. Show progress processing files. -n, --name PATTERN Filter run on /regexp/ or string. Known extensions: rails, pride Usage: bin/rails test [options] [files or directories] You can run a single test by appending a line number to a filename: bin/rails test test/models/user_test.rb:27 You can run multiple files and directories at the same time: bin/rails test test/controllers test/integration/login_test.rb By default test failures and errors are reported inline during a run. Rails options: -e, --environment ENV Run tests in the ENV environment -b, --backtrace Show the complete backtrace -d, --defer-output Output test failures and errors after the test run -f, --fail-fast Abort test run on first failure or error -c, --[no-]color Enable color in the output Rails 5

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Improved filtering of tests

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Rerun snippets

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$ bin/rails test test/controllers/posts_controller_test.rb:18 Run options: --seed 5361 # Running: F Failure: PostsControllerTest#test_should_create_post [railsconf_talk/test/ controllers/posts_controller_test.rb:19]: "Post.count" didn't change by 2. Expected: 4 Actual: 3 bin/rails test test/controllers/posts_controller_test.rb:18 Finished in 0.456947s, 2.1884 runs/s, 2.1884 assertions/s. 1 runs, 1 assertions, 1 failures, 0 errors, 0 skips Rails 5

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$ bin/rails test test/controllers/posts_controller_test.rb:18 Run options: --seed 5361 # Running: F Failure: PostsControllerTest#test_should_create_post [railsconf_talk/test/ controllers/posts_controller_test.rb:19]: "Post.count" didn't change by 2. Expected: 4 Actual: 3 bin/rails test test/controllers/posts_controller_test.rb:18 Finished in 0.456947s, 2.1884 runs/s, 2.1884 assertions/s. 1 runs, 1 assertions, 1 failures, 0 errors, 0 skips Rails 5

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Running multiple tests

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$ bin/rails test test/models/user_test.rb:27 test/models/ post_test.rb:42 Rails 5

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$ bin/rails test test/controllers test/integration Rails 5

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Improved reporting of failures

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Fail fast

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Backtrace

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Deferred output

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Colored output

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$ bin/rails t Run options: --seed 16545 # Running: ...F Failure: PostsControllerTest#test_should_create_post [/Users/ prathamesh/Projects/reproductions/railsconf_talk/test/ controllers/posts_controller_test.rb:19]: "Post.count" didn't change by 2. Expected: 4 Actual: 3 ✨ Rails 5

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Powered by Minitest 5

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Rails minitest plugin + Custom reporter

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Inspirations

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RSpec mintiest-reporters maxitest m and others &

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✅Durian ✅ Stinky tofu ✅ Other food that can't fit in

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Writing tests

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Unit tests Functional tests Integration tests

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Unit tests Functional tests Integration tests

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Controller tests

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What to test in a controller test

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req —> res

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req —> res

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class ArticlesControllerTest < ActionController::TestCase test "should create article" do assert_difference('Article.count') do post :create, article: { title: @article.title } end assert_redirected_to article_path(assigns(:article)) end end Rails 4

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class ArticlesControllerTest < ActionController::TestCase test "should create article" do assert_difference('Article.count') do post :create, article: { title: @article.title } end assert_redirected_to article_path(assigns(:article)) end end Rails 4

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class ArticlesControllerTest < ActionController::TestCase test "should create article" do assert_difference('Article.count') do post :create, article: { title: @article.title } end assert_redirected_to article_path(assigns(:article)) end end Rails 4

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req —> current state

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Easy

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But they Lie

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class ArticlesControllerTest < ActionController::TestCase test "should create article" do assert_difference('Article.count') do assert assigns(:article) post :create, article: { title: @article.title } end assert_redirected_to article_path(assigns(:article)) end end Rails 4

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Integration tests

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class ArticlesIntegrationTest < ActionDispatch::IntegrationTest test "should create article" do assert_difference('Article.count') do post articles_url, params: { article: { title: @article.title } } end assert_redirected_to article_path(Article.last) end end

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Almost same as controller test

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And it’s close to real world

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Slow!!

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Integration controller tests in Rails 5

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require 'test_helper' class UsersControllerTest < ActionDispatch::IntegrationTest setup do @user = users(:one) end test "should get index" do get users_url assert_response :success end test "should get new" do get new_user_url assert_response :success end test "should create user" do assert_difference('User.count') do post users_url, params: { user: { name: @user.name } } end assert_redirected_to user_path(User.last) end end Rails 5

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Functional controller tests soft deprecated

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Old functional tests will continue to work

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ActionController:: TestCase

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Might be extracted to a gem in Rails 5.1

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Implications

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class ArticlesControllerTest < ActionController::TestCase setup do john = users(:john) session[:user_id] = john.id end end Rails 4

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class ArticlesControllerTest < ActionController::TestCase setup do john = users(:john) session[:user_id] = john.id end end Rails 4

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class ArticlesControllerTest < ActionDispatch::IntegrationTest setup do john = users(:john) post login_url, params: {} end end Rails 5

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class ArticlesControllerTest < ActionDispatch::IntegrationTest setup do john = users(:john) post login_url, params: {} end end Rails 5

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class ArticlesControllerTest < ActionController::TestCase test ‘index’ do @request.headers["Accept"] = "text/plain, text/html” get :index end end Rails 4

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class ArticlesControllerTest < ActionDispatch::IntegrationTest test ‘index’ do @request.headers["Accept"] = "text/plain, text/html” get :index end end Rails 4

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class ArticlesControllerTest < ActionDispatch::IntegrationTest test ‘index’ do @request.headers["Accept"] = "text/plain, text/html” get :index end end # NoMethodError: undefined method `headers' for nil:NilClass Rails 5

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class ArticlesControllerTest < ActionDispatch::IntegrationTest test ‘index’ do get :index, headers: { accept: "text/plain, text/html” } end end Rails 5

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Controller tests == Integration tests Rails 5

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What not to test in a controller test?

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Don’t test controller internals

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test "repos" do get :index assert_response :success, 'successfully renders index' assert_not_nil assigns(:repos), 'assigns to repos' assert_not_nil assigns(:repos_subs), 'assigns to repos_subs' assert_template :index, 'render index template' end Rails 4

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test "repos" do get :index assert_response :success, 'successfully renders index' assert_not_nil assigns(:repos), 'assigns to repos' assert_not_nil assigns(:repos_subs), 'assigns to repos_subs' assert_template :index, 'render index template' end Rails 4

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test "repos" do get :index assert_response :success, 'successfully renders index' assert_not_nil assigns(:repos), 'assigns to repos' assert_not_nil assigns(:repos_subs), 'assigns to repos_subs' assert_template :index, 'render index template' end Rails 4

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def index @repos = Repo.all @repo_subs = Repo.first.repo_subs end Rails 4

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Scratching the surface

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test "repos" do get :index assert_response :success, 'successfully renders index' assert_select ".repo-item-title", text: 'issue_triage_sandbox' end Rails 5

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test "repos" do get :index assert_response :success, 'successfully renders index' assert_select ".repo-item-title", text: 'issue_triage_sandbox' end #=> Repo.first.name = ‘issue_triage_sandbox’ Rails 5

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gem ‘rails-dom-testing’

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Not just testing controller action in isolation

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End to end testing

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Controller View interface

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Controller View interface

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Just an implementation detail

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Deprecated assert_template assigns

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BUT

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Testing controller isolated from views

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gem ‘rails-controller-testing’

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Testing Rails 5 apps

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End to end testing

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We should talk more about it

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Much more than this

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Want to know more about Rails 5?

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Rails 5 Blog Series blog.bigbinary.com /categories/Rails-5

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This Week in Rails rails-weekly. ongoodbits.com

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拽拽 @_cha1tanya