The label should not include the input class. So we have to change this assertion to `label.collection_radio_buttons[for=user_active_true]` and also add a test case where we assert that if we don't pass the block the class will not be applied. This is true to almost all the attributes. According with https://github.com/rails/rails/commit/0b0ac5d917ccfe3e48bc75456dbccf48de7f33d0 we only need the namespace option, so I think we should do a whitelist of which input attributes label can use. Right now I think it is only `:index`, `:namespace` and `:multiple`.

We will also need tests like https://github.com/rails/rails/commit/0b0ac5d917ccfe3e48bc75456dbccf48de7f33d0#diff-6746e1de6bd857549ff49adfecafcd11R1285 to `:index` and `:multiple`.