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require 'minitest/reporters'
MiniTest::Unit.runner = MiniTest::SuiteRunner.new
MiniTest::Unit.runner.reporters << MiniTest::Reporters::SpecReporter.new
require 'minitest/autorun'
############## Page 215 ##############
class Gear
# ...
def gear_inches
ratio * wheel.diameter
end
end
############## Page 216 ##############
class Gear
attr_reader :chainring, :cog, :wheel, :observer
def initialize(args)
# ...
@observer = args[:observer]
end
# ...
def set_cog(new_cog)
@cog = new_cog
changed
end
def set_chainring(new_chainring)
@chainring = new_chainring
changed
end
def changed
observer.changed(chainring, cog)
end
# ...
end
############## Page ?? ##############
# Full listing for above
class Gear
attr_reader :chainring, :cog, :wheel, :observer
def initialize(args)
@chainring = args[:chainring]
@cog = args[:cog]
@wheel = args[:wheel]
@observer = args[:observer]
end
def gear_inches
ratio * wheel.diameter
end
def ratio
chainring / cog.to_f
end
def set_cog(new_cog)
@cog = new_cog
changed
end
def set_chainring(new_chainring)
@chainring = new_chainring
changed
end
def changed
observer.changed(chainring, cog)
end
end
############## Page 217 ##############
class GearTest < MiniTest::Unit::TestCase
def setup
@observer = MiniTest::Mock.new
@gear = Gear.new(
chainring: 52,
cog: 11,
observer: @observer)
end
def test_notifies_observers_when_cogs_change
@observer.expect(:changed, true, [52, 27])
@gear.set_cog(27)
@observer.verify
end
def test_notifies_observers_when_chainrings_change
@observer.expect(:changed, true, [42, 11])
@gear.set_chainring(42)
@observer.verify
end
end
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