moving to a new repo

about_nil.rb

@@ -0,0 +1,46 @@
+require 'edgecase'
+
+class AboutNil < EdgeCase::Koan
+  def test_nil_is_an_object
+    assert nil.is_a?(Object), "Unlike NULL in other languages"
+  end
+
+  def test_you_dont_get_null_pointer_errors_when_calling_methods_on_nil
+    #
+    #  What is the Exception that is thrown when you call a method that
+    #  does not exist?  
+    #
+    #  Hint:  launch irb and try the code in the block below.  
+    # 
+    #  Don't be confused by the code below yet.  It's using blocks 
+    #  which are explained later on in about_blocks.rb.  For now,
+    #  think about it like running nil.some_method_nil_doesnt_know_about
+    #  in a sandbox and catching the error class into the exception
+    #  variable.  
+    #
+    exception = assert_raise(___) do
+      nil.some_method_nil_doesnt_know_about
+    end
+    
+    # 
+    #  What is the error message itself? What substring or pattern could 
+    #  you test against in order to have a good idea what the string is?
+    #  
+    assert_match /__/, exception.message
+  end
+
+  def test_nil_has_a_few_methods_defined_on_it
+    assert_equal __, nil.nil?
+    assert_equal __, nil.to_s
+    assert_equal __, nil.inspect
+
+    # THINK ABOUT IT:
+    #
+    # Is it better to use
+    #    obj.nil?
+    # or
+    #    obj == nil
+    # Why?
+  end
+
+end