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Testing Should Be Fun Noel Rappin @noelrap Saturday, November 3, 12

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Who is this guy? Saturday, November 3, 12

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Kent Beck Saturday, November 3, 12

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Saturday, November 3, 12

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Saturday, November 3, 12

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In 2001, this was my RSpec Saturday, November 3, 12

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Saturday, November 3, 12

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Avdi Grimm, "Confident Ruby" Saturday, November 3, 12

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"This talk is fundamentally about joy." Saturday, November 3, 12

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Do we still love writing tests? Saturday, November 3, 12

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Or do we just love having written tests? Saturday, November 3, 12

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Or do we just love saying that we've written tests? Saturday, November 3, 12

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What makes testing fun? Saturday, November 3, 12

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Feedback Saturday, November 3, 12

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Communication Saturday, November 3, 12

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What makes testing painful? Saturday, November 3, 12

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Long run times Flakey Behavior Impentrable Saturday, November 3, 12

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Big Test Suites Saturday, November 3, 12

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Red. Green. Refactor. Saturday, November 3, 12

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The Real TDD Cycle: Saturday, November 3, 12

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Red. Green. Refactor.... Saturday, November 3, 12

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Green. Green. Green. Green. Green. Green. Green. Green. Green. Green. Green. Green. Green. Green. Green. Saturday, November 3, 12

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Tests are run way, way more than they are written Saturday, November 3, 12

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How many times does a test suite run per day? Saturday, November 3, 12

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What does it mean to add an extra test? Saturday, November 3, 12

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Time Clarity Error Rate Saturday, November 3, 12

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Tests can be legacy too Saturday, November 3, 12

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The uncanny testing valley Saturday, November 3, 12

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Too much testing to abandon, not enough testing to be confident Saturday, November 3, 12

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Details Matter Saturday, November 3, 12

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Why is refactoring part of the TDD cycle? Saturday, November 3, 12

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Refactor Tests Saturday, November 3, 12

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Some Test Refactorings Saturday, November 3, 12

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Given When Then Setup Run Saturday, November 3, 12

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Setup Saturday, November 3, 12

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Apply Behavioral Name Saturday, November 3, 12

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describe User do it "handles true input" do # ... end it "handles false input" do # ... end end Bad: Lazy Saturday, November 3, 12

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describe User do describe "check_permissions" do it "validates permissions" do # ... end it "invalidates no permissions" do # ... end end end Better: Structure by Method Saturday, November 3, 12

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describe User do describe "when checking for validations" do it "allows an admin user access" do # ... end it "denies a regular user access" do # ... end end end Best: Name by Behavior Saturday, November 3, 12

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Extract test Saturday, November 3, 12

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describe User do it "checks for validations" do user = User.new(:role => "admin") post = Post.new(:author => user) user.should be_able_to_see_post(post) user.role = "user" user.should be_able_to_see_post(post) post.author = User.new user.should_not be_able_to_see_post(post) end end Bad: Trying to do too much Saturday, November 3, 12

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describe User do it "allows an admin to see a post" do user = User.new(:role => "admin") post = Post.new(:author => user) user.should be_able_to_see_post(post) end it "allows a user to see their own post" user = User.new(:role => "user") post = Post.new(:author => user) user.should be_able_to_see_post(post) end end Better: one at a time Saturday, November 3, 12

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Extract setup Saturday, November 3, 12

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describe User do it "allows an admin to see a post" do user = User.new(:role => "admin") post = Post.new(:author => user) user.should be_able_to_see_post(post) end it "allows a user to see their own post" user = User.new(:role => "user") post = Post.new(:author => user) user.should be_able_to_see_post(post) end end Bad: Duplicate Setup Saturday, November 3, 12

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describe User do before(:each) do user = User.new(:role => "admin") post = Post.new(:author => user) end it "allows an admin to see a post" do user.should be_able_to_see_post(post) end it "allows a user to see their own post" user.should be_able_to_see_post(post) end end Better: Common setup Saturday, November 3, 12

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Given Saturday, November 3, 12

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Remove Extraneous Object Saturday, November 3, 12

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describe User do it "finds users who have high ratings" do (1 .. 10).each do |rating| User.create(:rating => rating, :name => "User #{rating}") end User.high_rating.map(&:name).should =~ ["User 9", "User 10"] end end Bad: Too many objects Saturday, November 3, 12

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Better: Just enough objects describe User do it "finds users who have high ratings" do high = User.create(:rating => 9) low = User.create(:rating => 8) User.high_rating.should =~ [high] end end Saturday, November 3, 12

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Remove Database Creation Saturday, November 3, 12

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Bad: Unnecessary DB hit describe User do it "finds users who have high ratings" do high = User.create(:rating => 9) low = User.create(:rating => 8) User.high_rating.should =~ [high] end end Saturday, November 3, 12

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Better: No DB Hit describe User do it "finds users who have high ratings" do high = User.new(:rating => 9) low = User.new(:rating => 8) User.high_rating.should =~ [high] end end Saturday, November 3, 12

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Remove default values Saturday, November 3, 12

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describe User do it "finds users who have high ratings" do high = User.new(:rating => 9, :password => "test", :password_confirmation => "test", :username => "test", :email => "[email protected]") low = User.new(:rating => 8, :password => "test", :password_confirmation => "test", :username => "test", :email => "[email protected]") User.high_rating.should =~ [high] end end Bad: Lots of noise Saturday, November 3, 12

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Better: Important stuff visible describe User do it "finds users who have high ratings" do high = Factory.build(:user, :rating => 9) low = Factory.build(:user, :rating => 8) User.high_rating.map(&:name).should =~ [high] end end Saturday, November 3, 12

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When Saturday, November 3, 12

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Separate actions Saturday, November 3, 12

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Scenario: User logs in Given I am a logged in user When I hit my home page Then I see my profile When I go to edit my profile Then my profile is updated When I go to see my content Then my content is available Saturday, November 3, 12

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Background: Given I am a logged in user Scenario: User logs in When I hit my home page Then I see my profile Scenario: User edits profile When I go to edit my profile Then my profile is updated Saturday, November 3, 12

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Invoke the action at the right level Saturday, November 3, 12

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Cucumber makes a lousy unit test framework Saturday, November 3, 12

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Then Saturday, November 3, 12

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Single Assertion Saturday, November 3, 12

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describe "historical type behavior" do before(:each) do user.deals_for(:restaurant, 2, 5) deal.types << :restaurant end it "knows the pct of types for restaurant" do user.pct_bought_for(:restaurant).should == 0.4 end it "knows the score for each restaurant type" do user.history_score_for(:restaurant).should == 90 end end Single assertion Saturday, November 3, 12

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Single test describe "historical type behavior" do it "calculates deal percentages" user.deals_seen_for(:restaurant, 2, 5) deal.types << :restaurant user.pct_bought_for(:restaurant).should == 0.4 user.history_score_for(:restaurant).should == 90 end end Saturday, November 3, 12

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Test the right thing Saturday, November 3, 12

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describe UserController do describe "get index" do it "searches properly" do @fred = User.create(:name => "Fred") @barney = User.create(:name => "Barney") get :index, :search => "Fred" assigns(:user).should == [@fred] end end end Saturday, November 3, 12

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Assert Primitive Object Saturday, November 3, 12

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describe User do it "searches properly" do @fred = User.create(:name => "Fred") @barney = User.create(:name => "Barney") result = User.search("Fred") result.should == [@fred] end end Using ActiveRecord in check Saturday, November 3, 12

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describe User do it "searches properly" do @fred = User.create(:name => "Fred") @barney = User.create(:name => "Barney") result = User.search("Fred") result.map(&:name).should == ["Fred"] end end Using literal in check Saturday, November 3, 12

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Switch to Spy Saturday, November 3, 12

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var cheeseburger = { cheeses: function() { // Ajax call to cheese server }; }; it('spies on the cheese server', function() { spyOn(cheeseburger, 'cheeses'); cheeseburger.cheeses(); expect(cheeseburger.cheeses).toHaveBeenCalled(); }); Saturday, November 3, 12

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Don't Assert Magic Literal Saturday, November 3, 12

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it "averages ratings" do vendor.add_ratings(3) deal.regular_price = 16.00 deal.sale_price = 12.00 user.relevance_of(deal).should == 42.5 end Saturday, November 3, 12

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it "averages ratings" do vendor.add_ratings(3) deal.regular_price = 16.00 deal.sale_price = 12.00 user.relevance_of(deal).should == (60 + (12.0 / 16)) / 2 end Saturday, November 3, 12

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Complement Boolean Test Saturday, November 3, 12

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Running Saturday, November 3, 12

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Reduce Friction Saturday, November 3, 12

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Display clearly Saturday, November 3, 12

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After Saturday, November 3, 12

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Listen to your tests Saturday, November 3, 12

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Are all these tests still needed? Saturday, November 3, 12

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Refactor Your Tests Saturday, November 3, 12

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Don't Shortcut the Process Saturday, November 3, 12

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Avoid the Uncanny Testing Valley Saturday, November 3, 12

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What do programmers love? Saturday, November 3, 12

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Developer testing is a means to an end Saturday, November 3, 12

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@noelrap http://www.groupon.com/techjobs http://www.noelrappin.com/mstwjs RUBY_2012_25 Saturday, November 3, 12