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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 | |
| ###################################################################### | |
| # SOLUTION 2 - Using mocks | |
| ###################################################################### | |
| require 'rubygems' | |
| require 'test/unit' | |
| require 'shoulda' | |
| require 'flexmock/test_unit' | |
| class QuizTestWithMocks < Test::Unit::TestCase | |
| context "A Quiz" do | |
| setup do | |
| @mock_io = flexmock("IO") | |
| @mock_io.should_receive(:puts).with("What is 2 + 3?").once.ordered | |
| @quiz = Quiz.new(@mock_io, @mock_io) | |
| flexmock(@quiz).should_receive(:rand).and_return(2, 3) | |
| end | |
| context 'when given the correct answer' do | |
| setup do | |
| @mock_io.should_receive(:gets).and_return("5\n").once.ordered | |
| end | |
| should 'receive a Correct response' do | |
| @mock_io.should_receive(:puts).with("Correct!").once.ordered | |
| @quiz.problem | |
| end | |
| end | |
| context 'when given an incorrect answer' do | |
| setup do | |
| @mock_io.should_receive(:gets).and_return("6\n").once.ordered | |
| end | |
| should 'receive an Incorrect response' do | |
| @mock_io.should_receive(:puts).with("Incorrect!").once.ordered | |
| @quiz.problem | |
| end | |
| end | |
| end | |
| end |
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