Updatd exception koan to be clearer about StandardError VS RuntimeError

koans/about_exceptions.rb

@@ -22,8 +22,8 @@ class AboutExceptions < EdgeCase::Koan
 
     assert_equal __, result
 
-    assert ex.is_a?(___), "Failure message."
+    assert_equal __, ex.is_a?(StandardError), "Should be a Standard Error"
-    assert ex.is_a?(___), "Failure message."
+    assert_equal __, ex.is_a?(RuntimeError),  "Should be a Runtime Error"
 
     assert RuntimeError.ancestors.include?(StandardError),
       "RuntimeError is a subclass of StandardError"

koans/about_symbols.rb

@@ -53,7 +53,7 @@ class AboutSymbols < EdgeCase::Koan
     assert_equal symbol, __.to_sym
   end
 
-  def test_symbols_with_spaces_can_be_built
+  def test_symbols_with_interpolation_can_be_built
     value = "and"
     symbol = :"cats #{value} dogs"
 

koans/edgecase.rb

@@ -93,16 +93,29 @@ module EdgeCase
     end
 
     def colorize(string, color_value)
-      if ENV['NO_COLOR']
+      if use_colors?
-        string
-      else
         color(color_value) + string + color(COLORS[:clear])
+      else
+        string
       end
     end
 
     def color(color_value)
       "\e[#{color_value}m"
     end
+
+    def use_colors?
+      return false if ENV['NO_COLOR']
+      if ENV['ANSI_COLOR'].nil?
+        ! using_windows?
+      else
+        ENV['ANSI_COLOR'] =~ /^(t|y)/i
+      end
+    end
+
+    def using_windows?
+      File::ALT_SEPARATOR
+    end
   end
 
   class Sensei

src/about_exceptions.rb

@@ -22,8 +22,8 @@ class AboutExceptions < EdgeCase::Koan
 
     assert_equal __(:exception_handled), result
 
-    assert ex.is_a?(___(StandardError)), "Failure message."
+    assert_equal __(true), ex.is_a?(StandardError), "Should be a Standard Error"
-    assert ex.is_a?(___(RuntimeError)), "Failure message."
+    assert_equal __(true), ex.is_a?(RuntimeError),  "Should be a Runtime Error"
 
     assert RuntimeError.ancestors.include?(StandardError), # __
       "RuntimeError is a subclass of StandardError"

src/about_symbols.rb

@@ -53,7 +53,7 @@ class AboutSymbols < EdgeCase::Koan
     assert_equal symbol, __("cats and dogs").to_sym
   end
 
-  def test_symbols_with_spaces_can_be_built
+  def test_symbols_with_interpolation_can_be_built
     value = "and"
     symbol = :"cats #{value} dogs"
 

src/edgecase.rb

@@ -93,16 +93,29 @@ module EdgeCase
     end
 
     def colorize(string, color_value)
-      if ENV['NO_COLOR']
+      if use_colors?
-        string
-      else
         color(color_value) + string + color(COLORS[:clear])
+      else
+        string
       end
     end
 
     def color(color_value)
       "\e[#{color_value}m"
     end
+
+    def use_colors?
+      return false if ENV['NO_COLOR']
+      if ENV['ANSI_COLOR'].nil?
+        ! using_windows?
+      else
+        ENV['ANSI_COLOR'] =~ /^(t|y)/i
+      end
+    end
+
+    def using_windows?
+      File::ALT_SEPARATOR
+    end
   end
 
   class Sensei