Minitest & Rails: Total BFFs

Rails 4 is switching to MiniTest from Test::Unit. What does this mean for you? MiniTest is more than an exercise in minimalism, it’s a full-featured testing framework. Using MiniTest, we can change our approach to application design and build Rails apps that are more flexible, easier to refactor, and more maintainable.

We’ll get straight to the good stuff: How to test validations. When to stub and when to mock. How to use fixtures, and when you should skip them. Can your model tests be faster? What about controller tests? And why you’d choose it over RSpec.

Have you worked on apps where the tests are mocked to the hilt and impossible to change when refactoring? Or wasted time hunting through dozens of files to find all the downstream methods called from one controller action? Or simply thrown tests away because your team can no longer maintain them? Then this session is for you.

Transcript

1. Minitest & Rails
   

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2. Minitest & Rails
   

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3. Minitest & Rails
   Total BFFs
   

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4. Let me tell
   you a story...
   

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7. Minitest is replacing
   Test::Unit in Rails 4
   

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9. How does
   minitest work?
   

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11. I’ll show you!
    

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12. Example Test
    

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13. class Pony
    def friendship
    "magic"
    end
    end
    test/pony_test.rb
    

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14. # class Pony
    # def friendship
    # "magic"
    # end
    # end
    test/pony_test.rb
    

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15. require "minitest/autorun"
    # class Pony
    # def friendship
    # "magic"
    # end
    # end
    test/pony_test.rb
    

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16. require "minitest/autorun"
    # class Pony
    # def friendship
    # "magic"
    # end
    # end
    class PonyTest < Minitest::Test
    end
    test/pony_test.rb
    

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17. require "minitest/autorun"
    # class Pony
    # def friendship
    # "magic"
    # end
    # end
    class PonyTest < Minitest::Test
    def test_friendship
    end
    end
    test/pony_test.rb
    

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18. require "minitest/autorun"
    # class Pony
    # def friendship
    # "magic"
    # end
    # end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    

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19. require "minitest/autorun"
    # class Pony
    # def friendship
    # "magic"
    # end
    # end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 49523
    # Running:
    E
    Finished in 0.000875s, 1142.8571 runs/s, 0.0000 assertions/s.
    1) Error:
    PonyTest#test_friendship:
    NameError: uninitialized constant PonyTest::Pony
    test/pony_test.rb:11:in `test_friendship'
    1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
    

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20. require "minitest/autorun"
    # class Pony
    # def friendship
    # "magic"
    # end
    # end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 49523
    # Running:
    E
    Finished in 0.000875s, 1142.8571 runs/s, 0.0000 assertions/s.
    1) Error:
    PonyTest#test_friendship:
    NameError: uninitialized constant PonyTest::Pony
    test/pony_test.rb:11:in `test_friendship'
    1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
    

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21. require "minitest/autorun"
    class Pony
    # def friendship
    # "magic"
    # end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    

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22. require "minitest/autorun"
    class Pony
    # def friendship
    # "magic"
    # end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 58892
    # Running:
    E
    Finished in 0.000793s, 1261.0340 runs/s, 0.0000 assertions/s.
    1) Error:
    PonyTest#test_friendship:
    NoMethodError: undefined method `friendship' for #
    test/pony_test.rb:11:in `test_friendship'
    1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
    

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23. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    

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24. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 17894
    # Running:
    F
    Finished in 0.000805s, 1242.2360 runs/s, 1242.2360 assertions/s.
    1) Failure:
    PonyTest#test_friendship [test/pony_test.rb:11]:
    Failed assertion, no message given.
    1 runs, 1 assertions, 1 failures, 0 errors, 0 skips
    

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25. require "minitest/autorun"
    class Pony
    def friendship
    "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    

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26. require "minitest/autorun"
    class Pony
    def friendship
    "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 3512
    # Running:
    .
    Finished in 0.000799s, 1251.5645 runs/s, 1251.5645 assertions/s.
    1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
    

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27. require "minitest/autorun"
    class Pony
    def friendship
    "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 3512
    # Running:
    .
    Finished in 0.000799s, 1251.5645 runs/s, 1251.5645 assertions/s.
    1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
    

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28. But Pinkie!
    

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29. But Pinkie!
    That assertion
    message was
    kinda ugly, right?
    

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30. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    

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31. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 17894
    # Running:
    F
    Finished in 0.000805s, 1242.2360 runs/s, 1242.2360 assertions/s.
    1) Failure:
    PonyTest#test_friendship [test/pony_test.rb:11]:
    Failed assertion, no message given.
    1 runs, 1 assertions, 1 failures, 0 errors, 0 skips
    

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32. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert(Pony.new.friendship == "magic")
    end
    end
    test/pony_test.rb
    

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33. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert((Pony.new.friendship == "magic"),
    "Friendship expected to be magic")
    end
    end
    test/pony_test.rb
    

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34. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert((Pony.new.friendship == "magic"),
    "Friendship expected to be magic")
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 28853
    # Running:
    F
    Finished in 0.000787s, 1270.6480 runs/s, 1270.6480 assertions/s.
    1) Failure:
    PonyTest#test_friendship [test/pony_test.rb:11]:
    Friendship expected to be magic
    1 runs, 1 assertions, 1 failures, 0 errors, 0 skips
    

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35. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    test/pony_test.rb
    

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36. require "minitest/autorun"
    class Pony
    def friendship
    # "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 53489
    # Running:
    F
    Finished in 0.028344s, 35.2808 runs/s, 35.2808 assertions/s.
    1) Failure:
    PonyTest#test_friendship [test/pony_test.rb:11]:
    Expected: "magic"
    Actual: nil
    1 runs, 1 assertions, 1 failures, 0 errors, 0 skips
    

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37. require "minitest/autorun"
    class Pony
    def friendship
    "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    test/pony_test.rb
    

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38. require "minitest/autorun"
    class Pony
    def friendship
    "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 13305
    # Running:
    .
    Finished in 0.000884s, 1131.2217 runs/s, 1131.2217 assertions/s.
    1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
    

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39. require "minitest/autorun"
    class Pony
    def friendship
    "magic"
    end
    end
    class PonyTest < Minitest::Test
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    test/pony_test.rb
    $ ruby test/pony_test.rb
    Run options: --seed 13305
    # Running:
    .
    Finished in 0.000884s, 1131.2217 runs/s, 1131.2217 assertions/s.
    1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
    

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40. TDD Process
    

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41. TDD Process
    •Test Class
    

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42. TDD Process
    •Test Class
    •Test Method
    

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43. TDD Process
    •Test Class
    •Test Method
    •Assertion
    

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44. TDD Process
    •Test Class
    •Test Method
    •Assertion
    •Error
    

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45. TDD Process
    •Test Class
    •Test Method
    •Assertion
    •Error
    •Failure
    

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46. TDD Process
    •Test Class
    •Test Method
    •Assertion
    •Error
    •Failure
    •Pass
    

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47. TDD Process
    •Test Class
    •Test Method
    •Assertion
    •Error
    •Failure
    •Pass
    •Refactor
    

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48. Testing Models
    

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49. class Pony
    def friendship
    "magic"
    end
    end
    app/models/pony.rb
    

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50. class Pony < ActiveRecord::Base
    def friendship
    "magic"
    end
    end
    app/models/pony.rb
    

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51. require "minitest/autorun"
    class PonyTest < Minitest::Test
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    test/pony_test.rb
    

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52. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def test_friendship
    assert_equal "magic", Pony.new.friendship
    end
    end
    app/models/pony.rb
    

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53. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= Pony.new name: "Twilight Sparkle"
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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54. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= Pony.new name: "Twilight Sparkle"
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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55. ActiveSupport::TestCase
    

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56. ActiveSupport::TestCase
    •Per-test
    database
    transactions
    

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57. ActiveSupport::TestCase
    •Per-test
    database
    transactions
    •Fixtures
    

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58. ActiveSupport::TestCase
    •Per-test
    database
    transactions
    •Fixtures
    •assert_blank
    

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59. ActiveSupport::TestCase
    •Per-test
    database
    transactions
    •Fixtures
    •assert_blank
    •assert_present
    

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60. ActiveSupport::TestCase
    •Per-test
    database
    transactions
    •Fixtures
    •assert_blank
    •assert_present
    •assert_difference
    

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61. ActiveSupport::TestCase
    •Per-test
    database
    transactions
    •Fixtures
    •assert_blank
    •assert_present
    •assert_difference
    •assert_no_difference
    

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62. But Pinkie!
    

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63. But Pinkie!
    What are
    fixtures?
    

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64. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= Pony.new name: "Twilight Sparkle"
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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65. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= Pony.new name: "Twilight Sparkle"
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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66. twilight:
    name: Twilight Sparkle
    email: twilight@ponyville.com
    pinkie:
    name: Pinkie Pie
    email: pinkie@ponyville.com
    test/fixtures/ponies.yml
    

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67. sprinkle:
    name: Twinkle Sprinkle
    fluffy:
    name: Fluffy Top
    test/fixtures/cupcakes.yml
    

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68. twilight_sprinkle:
    pony: twilight
    cupcake: sprinkle
    pinkie_fluffy:
    pony: pinkie
    cupcake: fluffy
    test/fixtures/favorites.yml
    

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69. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= Pony.new name: "Twilight Sparkle"
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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70. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= Pony.new name: "Twilight Sparkle"
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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71. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= ponies(:twilight)
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    

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72. require 'test_helper'
    class PonyTest < ActiveSupport::TestCase
    def twilight
    @twilight ||= ponies(:twilight)
    end
    def test_name
    assert_equal "Twilight Sparkle", twilight.name
    end
    def test_friendship
    assert_equal "magic", twilight.friendship
    end
    end
    app/models/pony.rb
    $ ruby test/pony_test.rb
    Run options: --seed 13305
    # Running:
    .
    Finished in 0.000884s, 1131.2217 runs/s, 1131.2217 assertions/s.
    1 runs, 1 assertions, 0 failures, 0 errors, 0 skips
    

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73. Testing Controllers
    

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74. test/controllers/cupcakes_test.rb
    require "test_helper"
    class CupcakesControllerTest < ActionController::TestCase
    def test_index
    get :index
    assert_response :success
    end
    def test_show
    get :show, id: cupcakes(:sprinkle)
    assert_response :success
    end
    end
    

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75. test/controllers/cupcakes_test.rb
    require "test_helper"
    class CupcakesControllerTest < ActionController::TestCase
    def test_index
    get :index
    assert_response :success
    end
    def test_show
    get :show, id: cupcakes(:sprinkle)
    assert_response :success
    end
    end
    $ rake test:controllers
    Run options: --seed 22699
    # Running tests:
    ..
    Finished tests in 0.124348s, 16.0839 tests/s, 16.0839 assertions/s.
    2 tests, 2 assertions, 0 failures, 0 errors, 0 skips
    

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76. ActionController::TestCase
    

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77. ActionController::TestCase
    •request
    

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78. ActionController::TestCase
    •request
    •response
    

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79. ActionController::TestCase
    •request
    •response
    •session
    

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80. ActionController::TestCase
    •request
    •response
    •session
    •flash
    

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81. ActionController::TestCase
    •request
    •response
    •session
    •flash
    •assert_response
    

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82. ActionController::TestCase
    •request
    •response
    •session
    •flash
    •assert_response
    •assert_redirected_to
    

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83. ActionController::TestCase
    •request
    •response
    •session
    •flash
    •assert_response
    •assert_redirected_to
    •assert_template
    

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84. Testing Helpers
    

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85. module CupcakesHelper
    def cupcake_image_tag cupcake
    image_tag cupcake.image_url, alt: cupcake.name
    end
    end
    app/helpers/cupcakes_helper.rb
    

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86. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.name, image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.image_url, image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    

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87. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.name, image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.image_url, image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    $ rake test:helpers
    Run options: --seed 59089
    # Running tests:
    ..
    Finished tests in 0.051314s, 38.9757 tests/s, 77.9514 assertions/s.
    2 tests, 4 assertions, 0 failures, 0 errors, 0 skips
    

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88. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.name, image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.image_url, image_tag_html
    end
    def test_blank_image_url
    @cupcake.image_url = nil
    image_tag_html = cupcake_image_tag @cupcake
    assert_match Cupcake::DEFAULT_IMAGE_URL, image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    

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89. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.name, image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.image_url, image_tag_html
    end
    def test_blank_image_url
    @cupcake.image_url = nil
    image_tag_html = cupcake_image_tag @cupcake
    assert_match Cupcake::DEFAULT_IMAGE_URL, image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    $ rake test:helpers
    Run options: --seed 23417
    # Running tests:
    .E.
    Finished tests in 0.050823s, 59.0284 tests/s, 78.7045 assertions/s.
    1) Error:
    CupcakesHelperTest#test_blank_image_url:
    NameError: uninitialized constant Cupcake::DEFAULT_IMAGE_URL
    app/helpers/cupcakes_helper.rb:5:in `cupcake_image_tag'
    test/helpers/cupcakes_helper_test.rb:22:in `test_blank_image_url'
    3 tests, 4 assertions, 0 failures, 1 errors, 0 skips
    

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90. class Cupcake < ActiveRecord::Base
    has_many :favorites
    has_many :ponies, through: :favorites
    end
    app/models/cupcake.rb
    

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91. class Cupcake < ActiveRecord::Base
    DEFAULT_IMAGE_URL = "/images/cupcake.png"
    has_many :favorites
    has_many :ponies, through: :favorites
    end
    app/models/cupcake.rb
    

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92. class Cupcake < ActiveRecord::Base
    DEFAULT_IMAGE_URL = "/images/cupcake.png"
    has_many :favorites
    has_many :ponies, through: :favorites
    end
    app/models/cupcake.rb
    $ rake test:helpers
    Run options: --seed 52680
    # Running tests:
    .F.
    Finished tests in 0.028242s, 106.2248 tests/s, 212.4495 assertions/s.
    1) Failure:
    CupcakesHelperTest#test_blank_image_url [~/pinkie_shop/test/helpers/
    cupcakes_helper_test.rb:23]:
    Expected /\/images\/cupcake\.png/ to match "\"\" />".
    3 tests, 6 assertions, 1 failures, 0 errors, 0 skips
    

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93. module CupcakesHelper
    def cupcake_image_tag cupcake
    image_tag cupcake.image_url, alt: cupcake.name
    end
    end
    app/helpers/cupcakes_helper.rb
    

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94. module CupcakesHelper
    def cupcake_image_tag cupcake
    url = cupcake.image_url
    url = Cupcake::DEFAULT_IMAGE_URL if url.blank?
    image_tag url, alt: cupcake.name
    end
    end
    app/helpers/
    

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95. module CupcakesHelper
    def cupcake_image_tag cupcake
    url = cupcake.image_url
    url = Cupcake::DEFAULT_IMAGE_URL if url.blank?
    image_tag url, alt: cupcake.name
    end
    end
    app/helpers/
    $ rake test:helpers
    Run options: --seed 32226
    # Running tests:
    ...
    Finished tests in 0.049226s, 60.9434 tests/s, 121.8868 assertions/s.
    3 tests, 6 assertions, 0 failures, 0 errors, 0 skips
    

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96. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.name, image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match @cupcake.image_url, image_tag_html
    end
    def test_blank_image_url
    @cupcake.image_url = nil
    image_tag_html = cupcake_image_tag @cupcake
    assert_match Cupcake::DEFAULT_IMAGE_URL, image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    

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97. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match "alt=\"#{@cupcake.name}\"", image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match "src=\"#{@cupcake.image_url}\"", image_tag_html
    end
    def test_blank_image_url
    @cupcake.image_url = nil
    image_tag_html = cupcake_image_tag @cupcake
    assert_match "src=\"#{Cupcake::DEFAULT_IMAGE_URL}\"", image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    

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98. require 'test_helper'
    class CupcakesHelperTest < ActionView::TestCase
    def setup
    @cupcake = Cupcake.new name: "Icy McIcerson",
    image_url: "http://i.imgur.com/mbWH1gM.png"
    end
    def test_alt_text
    image_tag_html = cupcake_image_tag @cupcake
    assert_match "alt=\"#{@cupcake.name}\"", image_tag_html
    end
    def test_image_url
    image_tag_html = cupcake_image_tag @cupcake
    assert_match "src=\"#{@cupcake.image_url}\"", image_tag_html
    end
    def test_blank_image_url
    @cupcake.image_url = nil
    image_tag_html = cupcake_image_tag @cupcake
    assert_match "src=\"#{Cupcake::DEFAULT_IMAGE_URL}\"", image_tag_html
    end
    end
    test/helpers/cupcakes_helper_test.rb
    $ rake test:helpers
    Run options: --seed 63012
    # Running tests:
    ...
    Finished tests in 0.048934s, 61.3071 tests/s, 122.6141 assertions/s.
    3 tests, 6 assertions, 0 failures, 0 errors, 0 skips
    

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99. Integration/Acceptance
    Tests
    

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100. View Slide

101. But Pinkie!
     

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102. But Pinkie!
     I really like the
     spec DSL...
     Can I still use it?
     

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103. app/models/pony.rb
     class Pony < ActiveRecord::Base
     has_many :favorites
     has_many :cupcakes, through: :favorites
     has_many :orders
     def friendship
     "magic"
     end
     end
     

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104. test/models/pony_test.rb
     require "test_helper"
     class PonyTest < ActiveSupport::TestCase
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     def test_name
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     def test_friendship
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     

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105. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     end
     

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106. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/spec"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     extend Minitest::Spec::DSL
     register_spec_type(self) do |desc|
     desc < ActiveRecord::Base if desc.is_a?(Class)
     end
     end
     

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107. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/spec"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     extend Minitest::Spec::DSL
     register_spec_type(self) do |desc|
     desc < ActiveRecord::Base if desc.is_a?(Class)
     end
     end
     

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108. require "test_helper"
     class PonyTest < ActiveSupport::TestCase
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     def test_name
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     def test_friendship
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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109. require "test_helper"
     describe Pony do
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     def test_name
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     def test_friendship
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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110. require "test_helper"
     describe Pony do
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     def test_name
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     def test_friendship
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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111. require "test_helper"
     describe Pony do
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     it "knows it's name" do
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     it "knows about friendship" do
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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112. require "test_helper"
     describe Pony do
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     it "knows it's name" do
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     it "knows about friendship" do
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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113. require "test_helper"
     describe Pony do
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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114. require "test_helper"
     describe Pony do
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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115. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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116. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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117. require "test_helper"
     class PonyTest < ActiveSupport::TestCase
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     def test_name
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     def test_friendship
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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118. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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119. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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120. test/controllers/cupcakes_test.rb
     require "test_helper"
     class CupcakesControllerTest < ActionController::TestCase
     def test_index
     get :index
     assert_response :success
     end
     def test_show
     get :show, id: cupcakes(:sprinkle)
     assert_response :success
     end
     end
     

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121. test/controllers/cupcakes_test.rb
     require "test_helper"
     describe CupcakesController do
     it 'shows a list of cupcakes' do
     get :index
     assert_response :success
     end
     it 'shows a cupcake' do
     get :show, id: cupcakes(:sprinkle)
     assert_response :success
     end
     end
     

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122. require 'test_helper'
     class CupcakesHelperTest < ActionView::TestCase
     def setup
     @cupcake = Cupcake.new name: "Icy McIcerson",
     image_url: "http://i.imgur.com/mbWH1gM.png"
     end
     def test_alt_text
     image_tag_html = cupcake_image_tag @cupcake
     assert_match "alt=\"#{@cupcake.name}\"", image_tag_html
     end
     def test_image_url
     image_tag_html = cupcake_image_tag @cupcake
     assert_match "src=\"#{@cupcake.image_url}\"", image_tag_html
     end
     def test_blank_image_url
     @cupcake.image_url = nil
     image_tag_html = cupcake_image_tag @cupcake
     assert_match "src=\"#{Cupcake::DEFAULT_IMAGE_URL}\"", image_tag_html
     end
     end
     test/helpers/cupcakes_helper_test.rb
     

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123. require 'test_helper'
     describe CupcakeHelper do
     let(:cupcake) { Cupcake.new name: "Icy McIcerson",
     image_url: "http://i.imgur.com/mbWH1gM.png" }
     let(:image_tag_html) { cupcake_image_tag cupcake }
     it "sets the alt text" do
     image_tag_html.must_match "alt=\"#{cupcake.name}\""
     end
     it "uses the image_url" do
     image_tag_html.must_match "src=\"#{cupcake.image_url}\""
     end
     it "uses a default image url if needed" do
     cupcake.image_url = nil
     image_tag_html.must_match "src=\"#{Cupcake::DEFAULT_IMAGE_URL}\""
     end
     end
     test/helpers/cupcakes_helper_test.rb
     

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124. But Pinkie!
     

     View Slide

125. But Pinkie!
     Can I use nested
     context blocks?
     

     View Slide

126. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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127. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     $ rake test:models
     Run options: --seed 43295
     # Running tests:
     ...
     Finished tests in 0.057017s, 52.6159 tests/s, 70.1545 assertions/s.
     3 tests, 4 assertions, 0 failures, 0 errors, 0 skips
     

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128. test/models/pony_test.rb
     require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     context do
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     end
     

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129. test/models/pony_test.rb
     require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     context do
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     end
     $ rake test:models
     rake aborted!
     undefined method `context' for #
     ~/pinkie_shop/test/models/pony_test.rb:10:in `block in '
     ~/pinkie_shop/test/models/pony_test.rb:3:in `'
     Tasks: TOP => test:models
     (See full trace by running task with --trace)
     Run options: --seed 55683
     # Running tests:
     ..
     Finished tests in 0.057922s, 34.5292 tests/s, 51.7938 assertions/s.
     2 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     

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130. test/models/pony_test.rb
     require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     describe :friendship do
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     end
     

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131. test/models/pony_test.rb
     require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     describe :friendship do
     it "knows about friendship" do
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     end
     $ rake test:models
     Run options: --seed 31855
     # Running tests:
     ..
     Finished tests in 0.076128s, 26.2715 tests/s, 39.4073 assertions/s.
     2 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     

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132. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/spec"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     class << self
     remove_method :describe
     end if self.respond_to? :describe
     extend Minitest::Spec::DSL
     register_spec_type(self) do |desc|
     desc < ActiveRecord::Base if desc.is_a?(Class)
     end
     end
     

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133. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/spec"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     class << self
     remove_method :describe
     end if self.respond_to? :describe
     extend Minitest::Spec::DSL
     register_spec_type(self) do |desc|
     desc < ActiveRecord::Base if desc.is_a?(Class)
     end
     end
     $ rake test:models
     Run options: --seed 24
     # Running tests:
     ...
     Finished tests in 0.054639s, 54.9058 tests/s, 73.2078 assertions/s.
     3 tests, 4 assertions, 0 failures, 0 errors, 0 skips
     

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134. But Pinkie!
     

     View Slide

135. But Pinkie!
     That’s a lot of
     test_helper config.
     Can it be simpler?
     

     View Slide

136. minitest-rails
     

     View Slide

137. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/spec"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     class << self
     remove_method :describe
     end if self.respond_to? :describe
     extend Minitest::Spec::DSL
     register_spec_type(self) do |desc|
     desc < ActiveRecord::Base if desc.is_a?(Class)
     end
     end
     

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138. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/rails"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in...
     #
     # Note: You'll currently still have to declare fixtures explicitly...
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     end
     

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139. But Pinkie!
     

     View Slide

140. But Pinkie!
     How do I turn my
     custom Assertions
     into Expectations?
     

     View Slide

141. test/pony_assertions.rb
     module PonyAssertions
     def assert_favorite cupcake, pony
     assert pony.cupcakes.include?(cupcake),
     "Expected #{pony.name} to have favorited #{cupcake.name}"
     end
     end
     class ActiveSupport::TestCase
     include PonyAssertions
     end
     

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142. test/pony_expectations.rb
     module PonyExpectations
     # assert_favorite apple_cupcake, apple_jack
     # apple_jack.must_have_favorited apple_cupcake
     infect_an_assertion :assert_favorite, :must_have_favorited
     end
     class Object
     include PonyExpectations
     end
     

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143. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/rails"
     require "pony_assertions"
     require "pony_expectations"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in
     alphabetical order.
     #
     # Note: You'll currently still have to declare fixtures explicitly in
     integration tests
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     end
     

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144. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/rails"
     require "pony_assertions"
     require "pony_expectations"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in
     alphabetical order.
     #
     # Note: You'll currently still have to declare fixtures explicitly in
     integration tests
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     end
     

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145. test/models/favorite_test.rb
     require "test_helper"
     class FavoriteTest < ActiveSupport::TestCase
     def test_favorite
     assert_favorite cupcakes(:sprinkle), ponies(:twilight)
     end
     end
     

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146. test/models/favorite_test.rb
     require "test_helper"
     describe Favorite do
     it "allows ponies to favorite cupcakes" do
     ponies(:twilight).must_have_favorited cupcakes(:sprinkle)
     end
     end
     

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147. But Pinkie!
     

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148. But Pinkie!
     Can I use
     describe/it blocks
     with assertions?
     

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149. require "test_helper"
     describe Pony do
     let(:twilight_sparkle) { Pony.new name: "Twilight Sparkle" }
     it "knows it's name" do
     assert_equal "Twilight Sparkle", twilight_sparkle.name
     end
     it "knows about friendship" do
     assert_equal "magic", twilight_sparkle.friendship
     end
     end
     test/models/pony_test.rb
     

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150. require "test_helper"
     class PonyTest < ActiveSupport::TestCase
     def twilight_sparkle
     @twilight_sparkle ||= Pony.new name: "Twilight Sparkle"
     end
     def test_name
     twilight_sparkle.name.must_equal "Twilight Sparkle"
     end
     def test_friendship
     twilight_sparkle.friendship.must_equal "magic"
     end
     end
     test/models/pony_test.rb
     

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151. But Pinkie!
     

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152. But Pinkie!
     I want to test
     my app using
     Capybara. Can I?
     

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153. minitest-rails-capybara
     

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154. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/rails"
     require "minitest/rails/capybara"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in
     alphabetical order.
     #
     # Note: You'll currently still have to declare fixtures explicitly in
     integration tests
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     end
     

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155. test/test_helper.rb
     ENV["RAILS_ENV"] ||= "test"
     require File.expand_path('../../config/environment', __FILE__)
     require 'rails/test_help'
     require "minitest/rails"
     require "minitest/rails/capybara"
     class ActiveSupport::TestCase
     ActiveRecord::Migration.check_pending!
     # Setup all fixtures in test/fixtures/*.yml for all tests in
     alphabetical order.
     #
     # Note: You'll currently still have to declare fixtures explicitly in
     integration tests
     # -- they do not yet inherit this setting
     fixtures :all
     # Add more helper methods to be used by all tests here...
     end
     

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156. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup
     @pinkie_password = "pinkiepie"
     @pinkie = ponies :pinkie
     @pinkie.password = @pinkie_password
     @pinkie.save
     end
     end
     

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157. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup
     @pinkie_password = "pinkiepie"
     @pinkie = ponies :pinkie
     @pinkie.password = @pinkie_password
     @pinkie.save
     end
     end
     

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158. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     assert_have_content page, "login"
     assert_have_content page, "signup"
     refute_have_content page, "logout"
     end
     end
     $ rake minitest:features
     Run options: --seed 65422
     # Running tests:
     .
     Finished tests in 0.179815s, 5.5613 tests/s, 16.6838 assertions/s.
     1 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     

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159. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     assert_have_content page, "login"
     assert_have_content page, "signup"
     refute_have_content page, "logout"
     end
     end
     $ rake minitest:features
     Run options: --seed 65422
     # Running tests:
     .
     Finished tests in 0.179815s, 5.5613 tests/s, 16.6838 assertions/s.
     1 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     $ rake minitest:features
     Run options: --seed 65422
     # Running tests:
     .
     Finished tests in 0.179815s, 5.5613 tests/s, 16.6838 assertions/s.
     1 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     

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160. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     assert_have_content page, "login"
     assert_have_content page, "signup"
     refute_have_content page, "logout"
     end
     end
     $ rake minitest:features
     Run options: --seed 65422
     # Running tests:
     .
     Finished tests in 0.179815s, 5.5613 tests/s, 16.6838 assertions/s.
     1 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     $ rake minitest:features
     Run options: --seed 65422
     # Running tests:
     .
     Finished tests in 0.179815s, 5.5613 tests/s, 16.6838 assertions/s.
     1 tests, 3 assertions, 0 failures, 0 errors, 0 skips
     

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161. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     assert_have_content page, "login"
     assert_have_content page, "signup"
     refute_have_content page, "logout"
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_have_content page, "logout"
     assert_have_content page, @pinkie.email
     refute_have_content page, "login"
     refute_have_content page, "signup"
     end
     end
     

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162. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     assert_have_content page, "login"
     assert_have_content page, "signup"
     refute_have_content page, "logout"
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_have_content page, "logout"
     assert_have_content page, @pinkie.email
     refute_have_content page, "login"
     refute_have_content page, "signup"
     end
     end
     $ rake minitest:features
     Run options: --seed 27176
     # Running tests:
     .
     Finished tests in 0.318181s, 3.1429 tests/s, 22.0001 assertions/s.
     1 tests, 7 assertions, 0 failures, 0 errors, 0 skips
     

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163. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     end
     def test_login_as_pinkie_pie ...
     end
     def assert_nav_links_logged_in pony
     page.must_have_content "logout"
     page.must_have_content pony.email
     page.wont_have_content "login"
     page.wont_have_content "signup"
     end
     def refute_nav_links_logged_in pony = nil
     page.must_have_content "login"
     page.must_have_content "signup"
     page.wont_have_content "logout"
     end
     end
     

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164. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     end
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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165. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     end
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     $ rake minitest:features
     Run options: --seed 51819
     # Running tests:
     .
     Finished tests in 0.285183s, 3.5065 tests/s, 24.5456 assertions/s.
     1 tests, 7 assertions, 0 failures, 0 errors, 0 skips
     

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166. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     end
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     $ rake minitest:features
     Run options: --seed 51819
     # Running tests:
     .
     Finished tests in 0.285183s, 3.5065 tests/s, 24.5456 assertions/s.
     1 tests, 7 assertions, 0 failures, 0 errors, 0 skips
     

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167. But Pinkie!
     

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168. But Pinkie!
     What about
     Capybara’s DSL?
     I really like it...
     

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169. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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170. test/features/login_test.rb
     require "test_helper"
     class LoginTest < Capybara::Rails::TestCase
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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171. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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172. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     def setup ...
     def test_login_as_pinkie_pie
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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173. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     def setup ...
     scenario "logging in as Pinkie Pie" do
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: @pinkie.email
     fill_in "Password", with: @pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in @pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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174. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     def setup
     @pinkie_password = "pinkiepie"
     @pinkie = ponies :pinkie
     @pinkie.password = @pinkie_password
     @pinkie.save
     end
     scenario "logging in as Pinkie Pie" do ...
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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175. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     given(:pinkie_password) { "pinkiepie" }
     def setup
     @pinkie = ponies :pinkie
     @pinkie.password = pinkie_password
     @pinkie.save
     end
     scenario "logging in as Pinkie Pie" do ...
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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176. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     given(:pinkie_password) { "pinkiepie" }
     given(:pinkie) { p = ponies :pinkie
     p.password = pinkie_password
     p.save
     p }
     scenario "logging in as Pinkie Pie" do ...
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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177. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     given(:pinkie_password) { "pinkiepie" }
     given(:pinkie) { p = ponies :pinkie ... }
     scenario "logging in as Pinkie Pie" do
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: pinkie.email
     fill_in "Password", with: pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     

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178. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     given(:pinkie_password) { "pinkiepie" }
     given(:pinkie) { p = ponies :pinkie ... }
     scenario "logging in as Pinkie Pie" do
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: pinkie.email
     fill_in "Password", with: pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     $ rake minitest:features
     Run options: --seed 51819
     # Running tests:
     .
     Finished tests in 0.285183s, 3.5065 tests/s, 24.5456 assertions/s.
     1 tests, 7 assertions, 0 failures, 0 errors, 0 skips
     

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179. test/features/login_test.rb
     require "test_helper"
     feature "Login Feature" do
     given(:pinkie_password) { "pinkiepie" }
     given(:pinkie) { p = ponies :pinkie ... }
     scenario "logging in as Pinkie Pie" do
     visit root_path
     refute_nav_links_logged_in
     click_link "login"
     fill_in "Email", with: pinkie.email
     fill_in "Password", with: pinkie_password
     click_button "Sign in"
     assert_nav_links_logged_in pinkie
     end
     def assert_nav_links_logged_in pony ...
     def refute_nav_links_logged_in pony = nil ...
     end
     $ rake minitest:features
     Run options: --seed 51819
     # Running tests:
     .
     Finished tests in 0.285183s, 3.5065 tests/s, 24.5456 assertions/s.
     1 tests, 7 assertions, 0 failures, 0 errors, 0 skips
     

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180. But Pinkie!
     

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181. But Pinkie!
     What about
     mocks?
     Or matchers?
     

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182. View Slide

183. View Slide

184. View Slide

185. View Slide

186. I’m sorry
     

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187. View Slide

188. Mike Moore
     @blowmage
     blowmage.com
     

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189. Questions/Comments?
     

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190. Twilight Sparkle Image Credits
     • Twilight Sparkle is Curious by Alixey
     http://alixey.deviantart.com/art/Twilight-Sparkle-is-Curious-335163906
     • Skeptical, annoyed Twilight by MrHavre
     http://mrhavre.deviantart.com/art/Skeptical-annoyed-Twilight-333256895
     • Twilight memories by HankOfficer
     http://hankofficer.deviantart.com/art/Twilight-memories-316846734
     • Twilight Sparkle's Transformation by Sairoch
     http://sairoch.deviantart.com/art/Twilight-Sparkle-s-Transformation-356096575
     • Twilight Sparkle Alicorn Vector by Kamyk962
     http://kamyk962.deviantart.com/art/Twilight-Sparkle-Alicorn-Vector-355000137
     

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191. Pinkie Pie Image Credits
     •Pinkie Pie by KyssS by KyssS90
     http://kysss90.deviantart.com/art/Pinkie-Pie-by-KyssS-353498032
     •Sly Pinkie Pie by Sairoch
     http://sairoch.deviantart.com/art/Sly-Pinkie-Pie-353454194
     •Season 2 Poster Pinkie Pie by VladimirMacHolzraum
     http://vladimirmacholzraum.deviantart.com/art/Season-2-Poster-
     Pinkie-Pie-333531305
     •Pinkie Pie by CrusierPL
     http://crusierpl.deviantart.com/art/Pinkie-Pie-279503261
     

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192. Pinkie Pie Image Credits
     •Pinkie Glasses by J-Brony
     http://j-brony.deviantart.com/art/Pinkie-Glasses-264170145
     •Extremely Surprised Pinkie by IamthegreatLyra
     http://iamthegreatlyra.deviantart.com/art/Extremely-Surprised-
     Pinkie-279356130
     •Haters Gonna' Hate by binaryNinj4
     http://binaryninj4.deviantart.com/art/Haters-Gonna-Hate-201850847
     •Pinkie Pie Overwrought by Sairoch
     http://sairoch.deviantart.com/art/Pinkie-Pie-Overwrought-363028991
     

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193. View Slide