Current progress

koans/about_modules.rb

@@ -0,0 +1,63 @@
+require File.expand_path(File.dirname(__FILE__) + '/neo')
+
+class AboutModules < Neo::Koan
+  module Nameable
+    def set_name(new_name)
+      @name = new_name
+    end
+
+    def here
+      :in_module
+    end
+  end
+
+  def test_cant_instantiate_modules
+    assert_raise(___) do
+      Nameable.new
+    end
+  end
+
+  # ------------------------------------------------------------------
+
+  class Dog
+    include Nameable
+
+    attr_reader :name
+
+    def initialize
+      @name = "Fido"
+    end
+
+    def bark
+      "WOOF"
+    end
+
+    def here
+      :in_object
+    end
+  end
+
+  def test_normal_methods_are_available_in_the_object
+    fido = Dog.new
+    assert_equal __, fido.bark
+  end
+
+  def test_module_methods_are_also_available_in_the_object
+    fido = Dog.new
+    assert_nothing_raised do
+      fido.set_name("Rover")
+    end
+  end
+
+  def test_module_methods_can_affect_instance_variables_in_the_object
+    fido = Dog.new
+    assert_equal __, fido.name
+    fido.set_name("Rover")
+    assert_equal __, fido.name
+  end
+
+  def test_classes_can_override_module_methods
+    fido = Dog.new
+    assert_equal __, fido.here
+  end
+end