PHPUNIT Zend framework how mock Zend_Registry::set to be tested against 1st datasource item only and unset it for the 2nd? - zend-framework

Question

I'm having an issue with creating this UT with PHPUNIT and Zend framework, i'm quite new its my second UT...
This is the function to test:
this is the function which the UT is made for:
protected function _functionToTest( $view ) {
if($this->domagick){
$view->details = array(
        'important value' => Zend_Registry::get('importantvalue')
                   'Some String' => $this->_getZendHelper()
);
}
}
Note that  $this->_getZendHelper() is the function that brings in the Zend_Registry::set('importantValue', '123');
It fails the second assertion, should I create 2 separate tests?
Is there any way to make
Zend_Registry::set('importantValue', '123');
to run against the first data provider (data1)
and then on the second run, disable it? as it should be Null, and it is creating an array instead of null.
Or should I mock it a particular manner?
my test code:
   /** #dataProvider functionToTestDataProvider
*/
    public function testfunctionToTest($message, $siteMagicSettings, $expected)
    {
// this is the value that is I cant understand how to "reset"
// for the second dataprovider test which expects null
        Zend_Registry::set('importantValue', '123');
        $myMockForDebug = $this->getMockBuilder('CLASS_Name_Jack')
            ->disableOriginalConstructor()
            ->setMethods(array('_getZendHelper, _functionToTest'))
            ->getMock();
        $myMockForDebug = $this->getPublicClass($myMockForDebug);
        $myMockForDebug->_siteMagicSettings = $siteMagicSettings;
        $myMockForDebug->expects($this->any())
            ->method('_getZendHelper')
            ->will($this->returnValue('hello world'));
        $zendFrameworkControllerFrontEndMockVariable= $this->getMockBuilder('Zend_Controller_Front')
            ->disableOriginalConstructor()
            ->setMethods(
                array(
                    'getMagicalContext';
                )
            )
            ->getMock();
        $myMockForDebug->_zendControllerFront = $zendFrameworkControllerFrontEndMock;
        $view = $myMockForDebug->_zendControllerFront;
        $myMockForDebug->_functionToTest($view);
        $this->assertEquals($expected , $view->details);
        $this->assertNull($expected , $view->details);
    }
my data provider:
    public function functionToTestDataProvider()
    {
        return [
            'data1'=> [
                    'message' => 'Do magick is true so it should create expected',
                    'siteMagicSettings' => (object) array(
                        'values' => (object) array(
                            'doMagick'=> 'true'
                        )
                    ),
                    'expected' => array(
                            'important value' => '123',
                            'Some String' => 'hello world'
                    ),
                ],
            'data2'=> [
                    'message' => 'Do magick is turned off',
                    'siteMagicSettings' => (object) array(
                        'values' => (object) array(
                            'doMagick'=> 'false'
                        )
                    ),
                    'expected' => null
                ]
            ];
    }
currently when I run the test , I get 1 Failure:
"data2" ('Do magick is turned off', stdClass, NULL)
Array (...) does not match expected type "NULL".

Answer 1

After all the comments I'll try to make an answer for this.
The main issue from my point of view is that your method to test is too much coupled with Zend components, that do not need to be tested, they are already tested by the framework.
So this is how I would refactor your code
protected function _functionToTest($carData, $helperString) {
return [
'important value' => $carData
'Some String' => $helperString
];
}
// ..and somewhere
$helperString = $this->_getZendHelper();
$view->details = $this->domagick ? $this->_functionToTest($this->car, $helperString) : [];
Your function does actually make nothing more than creating an array.