I'm having trouble mocking "$select->where->greaterThanOrEqualTo" with Zend\Db\Sql. Hope someone can shed light on this.

where-mock.php

/* 
 * Here's the function call. 
 * $searchCriteria is an instance of \Zend\InputFilter\InputFilter 
 */
$select->where->greaterThanOrEqualTo(
    "EventDate", new \Zend\Db\Sql\Expression(
        "STR_TO_DATE('" . $searchCriteria->getValue("startDate") ."','%m-%d-%Y')"
    )
);

// Here's my attempt to mock

$mockWhere = \Mockery::mock('Zend\Db\Sql\Where');
$mockWhere->shouldReceive('greaterThanOrEqualTo')->with(
    "EventDate",
    new \Zend\Db\Sql\Expression("STR_TO_DATE('" . $searchCriteria->getValue("startDate") ."','%m-%d-%Y')"
))->andReturn($mockWhere);

$mockSql = \Mockery::mock('Zend\Db\Sql\Select');
$mockSql->shouldReceive('select')->andReturn($mockSql);
$mockSql->shouldReceive('__get')->with('where')->andReturn($mockWhere);

// The error that I receive is: Fatal error: Call to a member function greaterThanOrEqualTo() on a non-object 

After a good chat on IRC and reading over https://github.com/padraic/mockery#php-magic-methods, I realise I've taken the wrong path and likely won't be able to test this.