Current progress

koans/about_proxy_object_project.rb

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