CakePHP 3 Unit Testing: posting data does not seem to be refactored by request object

I wrote a test that posts data like this:

$data = [ 'Clients[username]'=>'asdf' ];

$this->post('/url',$data);

In the controller method, when I print_r $this->request->data, it displays as this:

[ 'Clients[username]'=>'asdf' ]

However, if I go through a browser instead of phpunit, it is formed as such:

[ ['Clients'=>['username'=>'asdf'] ] ] which allows me to patchEntity or use newEntity with that data.

So my question is, what is the proper way to post data when Integration Testing a controller?

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