Use `assert_kind_of` instead.
Use `assert_*` method instead of using result value.
Use `do ... end` for test block.
Fix assert_equal argument order in test/t/proc.rb
Exception#exception fix test

Exception.exception is not call Exception#exception.
Test for Exception#exception should call Exception#exception method.
fix typo.
Replace assert_true with assert_equal.
Merge pull request #2318 from yui-knk/fix-typo

fix typo.
Merge pull request #2312 from take-cheeze/kind_of

Use `assert_kind_of` instead in `Proc#inspect` test.
Merge pull request #2314 from take-cheeze/fiber_test_refactor

Use `assert_*` method instead of using result value in fiber test.
Merge pull request #2315 from suzukaze/fix-test-proc

Fix assert_equal argument order in test/t/proc.rb
Merge pull request #2316 from ksss/test-exception

Exception#exception fix test
Merge pull request #2320 from yui-knk/test-enumerable

Replace assert_true with assert_equal.