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| # COMMUNITY CHALLENGE | |
| # | |
| # How would you test this Quiz#problem method? Only two rules: | |
| # | |
| # 1. The tests should fail if any part of the application breaks. | |
| # For example: If "gets" is moved before "puts" then the tests should | |
| # fail since that breaks the application. | |
| # | |
| # 2. You cannot change the Quiz class. But you can use whatever framework | |
| # and tools you want for the tests. (RSpec, Cucumber, etc.) | |
| # | |
| # Note: The first rule used to be "no mocking" but I changed it. If you | |
| # can accomplish the first rule with mocks then go ahead. I'm looking | |
| # for the simplest/cleanest solution whatever that may be. | |
| # | |
| class Quiz | |
| def initialize(input = STDIN, output = STDOUT) | |
| @input = input | |
| @output = output | |
| end | |
| def problem | |
| first = rand(10) | |
| second = rand(10) | |
| @output.puts "What is #{first} + #{second}?" | |
| answer = @input.gets | |
| if answer.to_i == first + second | |
| @output.puts "Correct!" | |
| else | |
| @output.puts "Incorrect!" | |
| end | |
| end | |
| end | |
| require "rubygems" | |
| require "test/unit" | |
| require "shoulda" | |
| class QuizIO | |
| attr_accessor :response, :should_calculate | |
| def gets | |
| if @should_calculate && @response =~ /What is (\d+) \+ (\d+)\?/ | |
| return $1.to_i + $2.to_i | |
| else | |
| return -1 | |
| end | |
| end | |
| def puts(s) | |
| @response = s | |
| end | |
| end | |
| class QuizTest < Test::Unit::TestCase | |
| context "A Quiz" do | |
| setup do | |
| @io = QuizIO.new | |
| @quiz = Quiz.new(@io, @io) | |
| end | |
| context "given a correct answer" do | |
| setup { @io.should_calculate = true ; @quiz.problem } | |
| should "get a 'Correct!' response" do | |
| assert_equal 'Correct!', @io.response | |
| end | |
| end | |
| context "given an incorrect answer" do | |
| setup { @io.should_calculate = false ; @quiz.problem } | |
| should "get an 'Incorrect!' response" do | |
| assert_equal 'Incorrect!', @io.response | |
| end | |
| end | |
| end | |
| end |
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