new is removed from Integer so doesn't need to be removed again in Fixnum
bob doesn't have new so don't undef
Raise a NameError when symbol isn't found.
Add undef var test
Improve undef tests
Improve alias tests
Improve ArgumentError tests
Add assert_not_equal
Improve Array tests
Fix Array Tests
Improve BasicObject tests
Improve Class tests
Improve Comparable tests
Add assert_not_include to test environment
Improve Enumerable tests
Improve Exception tests
Improve false tests
Singleton raises TypeError on #new
Remove incorrect removal of iv
Merge pull request #1275 from carsonmcdonald/undeffix

Fix for 1274