public function test_accessorsConnection()
 {
     /** === Test Data === */
     $CONN_NAME = 'connection name';
     $CONN = 'connection';
     /** === Setup Mocks === */
     // $this->_conn = $this->_resource->getConnectionByName($this->_nameConn);
     $mConn = $this->_mockConn();
     $this->mResource->shouldReceive('getConnectionByName')->once()->andReturn($mConn);
     /** === Call and asserts  === */
     $res = $this->obj->getConnection($CONN_NAME);
     $this->assertTrue($res instanceof \Magento\Framework\DB\Adapter\AdapterInterface);
     $this->obj->setConnection($CONN);
     $res = $this->obj->getConnection();
     $this->assertEquals($CONN, $res);
 }