Fix tests for Ruby 2.4 support #5
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In Ruby 2.4 and older, there is no dedicated
FrozenErrorexception. Instead, those Rubies raised aRuntimeErrorwhen trying to modify a frozen object.This pull requests fixes the tests on Ruby 2.4 by "mocking" the
FrozenErrorclass in the scope of the test to be theRuntimeErrorclass.Note: this pull request is on top of #4 (for a more linear history). If you want to only merge this one, I can gladly move the commits around.