what is the best way to test beforeSave that requests data from the current model

Biting the bullet and doing some playing around with model unit testing.

As a bit of a trial, I've got a beforeSave which searches $this for the max of a field and increments it by 1.

code:

public function beforeSave($options = array()) {      if (!isset($this->data['number'])) {          $lastNumber = $this->find('first', [              'fields' => ['id', 'max_number'],              'conditions' => ['Issue.project_id' => $this->data['project_id']]          ]);          $this->data['number'] = ++$lastNumber['Issue']['max_number'];      }      return true;  }

max_number is a virtual field described by

public $virtualFields = array(          'max_number' => 'MAX(number)'  );
  

My test asserts that the $this->Issue->beforeSave() returns true, and that $this->Issue->data['number'] is a predictable result:

  
public function testBeforeSaveShouldIncrementNewIssueNumber() {      $this->loadFixtures('Issue', 'Project', 'IssueType');        $this->Issue->data = [          'project_id' => 1,          'type_id' => 1,          'short_description' => 'lorem ipsum',          'description' => 'Lorem ipsum dolor sit amet',          'created' => '2013-06-07 13:34:20',          'modified' => '2013-06-07 13:34:20',      ];      $this->assertTrue($this->Issue->beforeSave());      // assumes the fixture has 10 records for project 1      $this->assertEquals(11, $this->Issue->data['number']);  }

I feel that using fixtures here is a little bit dirty - is there a way to pass mocked data to beforeSave in this instance and remove the need for the database/fixtures in this instance given all beforeSave() is doing is adding incrementing the max_number for a Project?

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