[ruby/irb] Fix test runner exit bug (https://github.com/ruby/irb/pull/728)
Remove useless test setup and teardown that sets MAIN_CONTEXT to nil
Avoid adding command methods to main object in test
https://github.com/ruby/irb/commit/f204829a08
[ruby/irb] Fix test runner exit bug
(https://github.com/ruby/irb/pull/728)
Remove useless test setup and teardown that sets MAIN_CONTEXT to nil
Avoid adding command methods to main object in test
https://github.com/ruby/irb/commit/f204829a08