public function testCount()
{
$company = new Company();
$company->CompanyName = "a";
$company->save();
$company = new Company();
$company->CompanyName = "b";
$company->save();
$company = new Company();
$company->CompanyName = "b";
$company->save();
$company = new Company();
$company->CompanyName = "a";
$company->save();
$collection = Company::find();
list($companies) = $collection->calculateAggregates(new CountDistinct("CompanyName"));
$this->assertEquals(2, $companies);
}