zf-db-mock.php

    public function testInsertingSomething()
    {
        $something = array(
            'something_id' => 123,
            'someother_value' => 10
        );

        $dbMock = m::mock('Zend_Db_Adapter_Mysqli');
        $dbMock->shouldReceive('fetchOne')
            ->with('SELECT something_id FROM somethings WHERE something_id = ?', 123)
            ->andReturn(false);
        $dbMock->shouldReceive('insert')
            ->with('somethings', $something)
            ->andReturn(1);

        $this->model->setDb($dbMock);

        $this->model->saveSomething($something);
    }