- updated minitest to 5.0
- Removed Test::Unit::TestCase and started using Minitest::Test instead
- Fixed usage of assert_raise
- Fixed usage of refute_nil
- Fixed and removed usage of assert_nothing_raised
In delegator_test.rb, there are two tests named
"registers helpers with the delegation target", causing "method
redefined" warnings and the first test not to be run.
Rename the second test so that all tests run.