155 lines
3.3 KiB
Ruby
155 lines
3.3 KiB
Ruby
require File.expand_path(File.dirname(__FILE__) + '/edgecase')
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# Project: Create a Proxy Class
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#
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# In this assignment, create a proxy class (one is started for you
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# below). You should be able to initialize the proxy object with any
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# object. Any messages sent to the proxy object should be forwarded
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# to the target object. As each message is sent, the proxy should
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# record the name of the method send.
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#
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# The proxy class is started for you. You will need to add a method
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# missing handler and any other supporting methods. The specification
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# of the Proxy class is given in the AboutProxyObjectProject koan.
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class Proxy
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def initialize(target_object)
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@object = target_object
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# ADD MORE CODE HERE
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end
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# WRITE CODE HERE
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end
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# The proxy object should pass the following Koan:
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#
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class AboutProxyObjectProject < EdgeCase::Koan
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def test_proxy_method_returns_wrapped_object
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# NOTE: The Television class is defined below
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tv = Proxy.new(Television.new)
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assert tv.instance_of?(Proxy)
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end
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def test_tv_methods_still_perform_their_function
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tv = Proxy.new(Television.new)
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tv.channel = 10
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tv.power
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assert_equal 10, tv.channel
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assert tv.on?
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end
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def test_proxy_records_messages_sent_to_tv
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tv = Proxy.new(Television.new)
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tv.power
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tv.channel = 10
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assert_equal [:power, :channel=], tv.messages
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end
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def test_proxy_handles_invalid_messages
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tv = Proxy.new(Television.new)
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assert_raise(NoMethodError) do
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tv.no_such_method
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end
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end
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def test_proxy_reports_methods_have_been_called
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tv = Proxy.new(Television.new)
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tv.power
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tv.power
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assert tv.called?(:power)
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assert ! tv.called?(:channel)
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end
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def test_proxy_counts_method_calls
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tv = Proxy.new(Television.new)
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tv.power
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tv.channel = 48
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tv.power
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assert_equal 2, tv.number_of_times_called(:power)
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assert_equal 1, tv.number_of_times_called(:channel=)
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assert_equal 0, tv.number_of_times_called(:on?)
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end
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def test_proxy_can_record_more_than_just_tv_objects
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proxy = Proxy.new("Code Mash 2009")
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proxy.upcase!
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result = proxy.split
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assert_equal ["CODE", "MASH", "2009"], result
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assert_equal [:upcase!, :split], proxy.messages
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end
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end
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# ====================================================================
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# The following code is to support the testing of the Proxy class. No
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# changes should be necessary to anything below this comment.
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# Example class using in the proxy testing above.
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class Television
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attr_accessor :channel
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def power
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if @power == :on
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@power = :off
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else
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@power = :on
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end
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end
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def on?
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@power == :on
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end
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end
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# Tests for the Television class. All of theses tests should pass.
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class TelevisionTest < EdgeCase::Koan
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def test_it_turns_on
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tv = Television.new
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tv.power
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assert tv.on?
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end
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def test_it_also_turns_off
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tv = Television.new
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tv.power
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tv.power
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assert ! tv.on?
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end
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def test_edge_case_on_off
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tv = Television.new
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tv.power
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tv.power
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tv.power
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assert tv.on?
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tv.power
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assert ! tv.on?
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end
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def test_can_set_the_channel
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tv = Television.new
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tv.channel = 11
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assert_equal 11, tv.channel
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end
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end
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