Current progress

koans/about_scope.rb

@@ -0,0 +1,79 @@
+require File.expand_path(File.dirname(__FILE__) + '/neo')
+
+class AboutScope < Neo::Koan
+  module Jims
+    class Dog
+      def identify
+        :jims_dog
+      end
+    end
+  end
+
+  module Joes
+    class Dog
+      def identify
+        :joes_dog
+      end
+    end
+  end
+
+  def test_dog_is_not_available_in_the_current_scope
+    assert_raise(___) do
+      Dog.new
+    end
+  end
+
+  def test_you_can_reference_nested_classes_using_the_scope_operator
+    fido = Jims::Dog.new
+    rover = Joes::Dog.new
+    assert_equal __, fido.identify
+    assert_equal __, rover.identify
+
+    assert_equal __, fido.class != rover.class
+    assert_equal __, Jims::Dog != Joes::Dog
+  end
+
+  # ------------------------------------------------------------------
+
+  class String
+  end
+
+  def test_bare_bones_class_names_assume_the_current_scope
+    assert_equal __, AboutScope::String == String
+  end
+
+  def test_nested_string_is_not_the_same_as_the_system_string
+    assert_equal __, String == "HI".class
+  end
+
+  def test_use_the_prefix_scope_operator_to_force_the_global_scope
+    assert_equal __, ::String == "HI".class
+  end
+
+  # ------------------------------------------------------------------
+
+  PI = 3.1416
+
+  def test_constants_are_defined_with_an_initial_uppercase_letter
+    assert_equal __, PI
+  end
+
+  # ------------------------------------------------------------------
+
+  MyString = ::String
+
+  def test_class_names_are_just_constants
+    assert_equal __, MyString == ::String
+    assert_equal __, MyString == "HI".class
+  end
+
+  def test_constants_can_be_looked_up_explicitly
+    assert_equal __, PI == AboutScope.const_get("PI")
+    assert_equal __, MyString == AboutScope.const_get("MyString")
+  end
+
+  def test_you_can_get_a_list_of_constants_for_any_class_or_module
+    assert_equal __, Jims.constants
+    assert Object.constants.size > _n_
+  end
+end