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
Merge pull request #1279 from Bovi-Li/improve-tests

Improve Test Infrastructure (Part 1)
Merge branch 'master' into iij