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# COMMUNITY CHALLENGE | |
# | |
# How would you test this Quiz#problem method? Only two rules: | |
# | |
# 1. You must test the order the gets/puts happen. The tests should not | |
# still pass if "gets" happens before "puts", etc. | |
# | |
# 2. No changing the Quiz class implementation/structure. But you can | |
# use whatever framework you want for the tests. | |
# | |
# 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 "test/unit" | |
class Responder | |
attr_accessor :response, :result | |
def puts(message) | |
if message.match(/What is (\d+) \+ (\d+)\?/) | |
self.result = caculate($1.to_i, $2.to_i).to_s | |
else | |
self.response = message | |
end | |
end | |
alias :gets :result | |
end | |
class GoodResponder < Responder | |
def caculate(a, b) | |
a + b | |
end | |
end | |
class BadResponder < Responder | |
def caculate(a, b) | |
(a + b).next | |
end | |
end | |
class QuizTest < Test::Unit::TestCase | |
def test_correct | |
io = GoodResponder.new | |
quiz = Quiz.new(io, io) | |
quiz.problem | |
assert_equal 'Correct!', io.response | |
end | |
def test_incorrect | |
io = BadResponder.new | |
quiz = Quiz.new(io, io) | |
quiz.problem | |
assert_equal 'Incorrect!', io.response | |
end | |
end |
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