Fix arguments passing in testing isolation

The issue affects MRI 2.2.5, MRI 2.3.3, JRuby 9.1.6.0. It can be reproduced by:

```
$ cd activemodel
$ NO_FORK=1 bundle exec rake test
```

If we wrap original arguments in quotes, it will be considered as a one big single argument.
Later, [`rake/rake_test_loader.rb`](https://github.com/ruby/rake/blob/7863b97/lib/rake/rake_test_loader.rb#L15)
will iterate over ARGS and try to require that huge single "argument" (which is a list of multiple .rb files).
This leads to an exception:

```
/Users/kir/Project
s/opensource/rails/vendor/bundle/gems/rake-11.3.0/lib/rake/rake_test_loader.rb:15:in `require': cannot load such file -- /Users/kir/Projects/opensource/rails/activemodel/test/cases/
attribute_assignment_test.rb [stripped] /Users/kir/Projects/opensource/rails/activemodel/test/cases/validations/with_validation_test.rb /Users/kir/Projects/opensource/rails/activemodel/test/cases/validations_test
.rb (LoadError)

        from /Users/kir/Projects/opensource/rails/vendor/bundle/gems/rake-11.3.0/lib/rake/rake_test_loader.rb:15:in `block in <main>'
        from /Users/kir/Projects/opensource/rails/vendor/bundle/gems/rake-11.3.0/lib/rake/rake_test_loader.rb:4:in `select'
        from /Users/kir/Projects/opensource/rails/vendor/bundle/gems/rake-11.3.0/lib/rake/rake_test_loader.rb:4:in `<main>'
```

Originally quotes were introduced in https://github.com/rails/rails/pull/19819 to fix MRI 2.2.2.

The fix solves issue on all affected platforms: MRI 2.2.5, MRI 2.3.3, JRuby 9.1.6.0.

0 files changed, 0 insertions, 0 deletions