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require 'minitest/reporters'
MiniTest::Unit.runner = MiniTest::SuiteRunner.new
MiniTest::Unit.runner.reporters << MiniTest::Reporters::SpecReporter.new
require 'minitest/autorun'
############## From previous example ##############
class Wheel
attr_reader :rim, :tire
def initialize(rim, tire)
@rim = rim
@tire = tire
end
def width
rim + (tire * 2)
end
# ...
end
############## From previous example ##############
class Gear
attr_reader :chainring, :cog, :wheel
def initialize(args)
@chainring = args[:chainring]
@cog = args[:cog]
@wheel = args[:wheel]
end
def gear_inches
ratio * wheel.diameter
end
def ratio
chainring / cog.to_f
end
# ...
end
############## From previous example ##############
module DiameterizableInterfaceTest
def test_implements_the_diameterizable_interface
assert_respond_to(@object, :width)
end
end
############## Page 228 ##############
# Full example is below.
class DiameterDouble
def width
10
end
end
############## Full example, so tests will run.
class DiameterDouble
def width
10
end
end
class DiameterDoubleTest < MiniTest::Unit::TestCase
include DiameterizableInterfaceTest
def setup
@object = DiameterDouble.new
end
end
class GearTest < MiniTest::Unit::TestCase
def test_calculates_gear_inches
gear = Gear.new(
chainring: 52,
cog: 11,
wheel: DiameterDouble.new)
assert_in_delta(47.27,
gear.gear_inches,
0.01)
end
end
############## Page 228 ##############
# Full listing is below
class Gear
def gear_inches
# finally, 'width' instead of 'diameter'
ratio * wheel.width
end
# ...
end
############## Page ??? ##############
class Gear
attr_reader :chainring, :cog, :wheel
def initialize(args)
@chainring = args[:chainring]
@cog = args[:cog]
@wheel = args[:wheel]
end
def gear_inches
ratio * wheel.width
end
def ratio
chainring / cog.to_f
end
# ...
end