updated to latest koans files (sans edgecase.rb)

koans/about_dice_project.rb

@@ -1,11 +1,10 @@
 require File.expand_path(File.dirname(__FILE__) + '/edgecase')
 
-class DiceSet
-  attr_reader :values
-  def roll(n)
-    @values = (1..n).map { rand(6) + 1 }
-  end
-end
+# Implement a DiceSet Class here:
+#
+# class DiceSet
+#   code ...
+# end
 
 class AboutDiceProject < EdgeCase::Koan
   def test_can_create_a_dice_set

koans/about_java_interop.rb

@@ -95,6 +95,19 @@ def test_however_most_methods_returning_strings_return_ruby_strings
     assert_equal __, java_array.toString.is_a?(java.lang.String)
   end
 
+  def test_some_ruby_objects_can_be_coerced_to_java
+    assert_equal __, "ruby string".to_java.class
+    assert_equal __, 1.to_java.class
+    assert_equal __, 9.32.to_java.class
+    assert_equal __, false.to_java.class
+  end
+
+  def test_some_ruby_objects_are_not_coerced_to_what_you_might_expect
+    assert_equal __, [].to_java.class == Java::JavaUtil::ArrayList
+    assert_equal __, {}.to_java.class == Java::JavaUtil::HashMap
+    assert_equal __, Object.new.to_java.class == Java::JavaLang::Object
+  end
+
   def test_java_collections_are_enumerable
     java_array = java.util.ArrayList.new
     java_array << "one" << "two" << "three"

koans/about_symbols.rb

@@ -11,8 +11,8 @@ def test_symbols_can_be_compared
     symbol2 = :a_symbol
     symbol3 = :something_else
 
-    assert symbol1 == __
-    assert symbol1 != __
+    assert_equal __, symbol1 == symbol2
+    assert_equal __, symbol1 == symbol3
   end
 
   def test_identical_symbols_are_a_single_internal_object
@@ -24,14 +24,14 @@ def test_identical_symbols_are_a_single_internal_object
   end
 
   def test_method_names_become_symbols
-    all_symbols = Symbol.all_symbols
-    assert_equal __, all_symbols.include?(:test_method_names_become_symbols)
+    symbols_as_strings = Symbol.all_symbols.map { |x| x.to_s }
+    assert_equal __, symbols_as_strings.include?("test_method_names_become_symbols")
   end
 
   # THINK ABOUT IT:
   #
-  # Why do we capture the list of symbols before we check for the
-  # method name?
+  # Why do we convert the list of symbols to strings and then compare
+  # against the string value rather than against symbols?
 
   in_ruby_version("mri") do
     RubyConstant = "What is the sound of one hand clapping?"

koans/about_to_str.rb

@@ -0,0 +1,54 @@
+require File.expand_path(File.dirname(__FILE__) + '/edgecase')
+
+class AboutToStr < EdgeCase::Koan
+
+  class CanNotBeTreatedAsString
+    def to_s
+      "non-string-like"
+    end
+  end
+
+  def test_to_s_returns_a_string_representation
+    not_like_a_string = CanNotBeTreatedAsString.new
+    assert_equal __, not_like_a_string.to_s
+  end
+
+  def test_normally_objects_cannot_be_used_where_strings_are_expected
+    assert_raise(___) do
+      File.exist?(CanNotBeTreatedAsString.new)
+    end
+  end
+
+  # ------------------------------------------------------------------
+
+  class CanBeTreatedAsString
+    def to_s
+      "string-like"
+    end
+
+    def to_str
+      to_s
+    end
+  end
+
+  def test_to_str_also_returns_a_string_representation
+    like_a_string = CanBeTreatedAsString.new
+    assert_equal __, like_a_string.to_str
+  end
+
+  def test_to_str_allows_objects_to_be_treated_as_strings
+    assert_equal __, File.exist?(CanBeTreatedAsString.new)
+  end
+
+  # ------------------------------------------------------------------
+
+  def acts_like_a_string?(string)
+    string = string.to_str if string.respond_to?(:to_str)
+    string.is_a?(String)
+  end
+
+  def test_user_defined_code_can_check_for_to_str
+    assert_equal __, acts_like_a_string?(CanNotBeTreatedAsString.new)
+    assert_equal __,  acts_like_a_string?(CanBeTreatedAsString.new)
+  end
+end

koans/path_to_enlightenment.rb

@@ -31,6 +31,7 @@
 require 'about_class_methods'
 require 'about_message_passing'
 require 'about_proxy_object_project'
+require 'about_to_str'
 in_ruby_version("jruby") do
   require 'about_java_interop'
 end