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OO-style FuzzBuzz solution in Ruby
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class FuzzBuzz | |
attr_reader :n, :fuzzbuzzable | |
def initialize(n, fuzzbuzzable) | |
@n = n | |
@fuzzbuzzable = fuzzbuzzable | |
end | |
def do_it | |
n.times do |i| | |
fuzzbuzzable.fuzz(i) if i % 3 == 0 | |
fuzzbuzzable.buzz(i) if i % 5 == 0 | |
end | |
end | |
end | |
class PrintToStdoutFuzzBuzzable | |
def fuzz(i) | |
puts "#{i}: fuzz" | |
end | |
def buzz(i) | |
puts "#{i}: buzz" | |
end | |
end | |
if __FILE__ == $0 | |
fuzzbuzzable = PrintToStdoutFuzzBuzzable.new | |
fuzzbuzz = FuzzBuzz.new(100, fuzzbuzzable) | |
fuzzbuzz.do_it | |
end |
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require_relative 'fuzzbuzz' | |
shared_examples 'fuzzbuzz duck' do | |
let(:duck) { described_class.new } | |
it 'implements fuzzbuzz interface' do | |
expect(duck).to respond_to(:fuzz, :buzz) | |
end | |
end | |
describe PrintToStdoutFuzzBuzzable do | |
include_examples 'fuzzbuzz duck' | |
end | |
describe FuzzBuzz do | |
describe '#do_it' do | |
it 'performs main algorithm' do | |
fuzzbuzzable = instance_double('PrintToStdoutFuzzBuzzable') | |
fuzzbuzz = FuzzBuzz.new(16, fuzzbuzzable) | |
expect(fuzzbuzzable).to receive(:fuzz).exactly(5).times | |
expect(fuzzbuzzable).to receive(:buzz).exactly(3).times | |
expect(fuzzbuzzable).to receive(:fuzz).with(15).ordered | |
expect(fuzzbuzzable).to receive(:buzz).with(15).ordered | |
fuzzbuzz.do_it | |
end | |
end | |
end |
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