t.verbose=true in Rake::Task.new doesn't work

When 'rake test' with verbose output,
``` bash
rake test TESTOPTS="-v"
``` 

works well, but 
``` ruby
Rake::TestTask.new do |t|
     t.verbose = true
end
```
does not work.

Changing it to
``` ruby
     t.options = '-v'
```

it works.

If it is the specs, please change the example from  `t.verbose = true` to  `t.options = '-v' `
