Problem with Session and PHP Unit Test

Hi!

I baked new UnitTestsController for testing purposes and put inside the function:

public function reset_filters() {
     // suppose to delete CurrentFilter var from session
     this->request->session()->delete('CurrentFilter');
}

I wanted to test session so I baked also UnitTestsControllerTest.php 

public function testResetFilters() {
         $session = new Session;

         
         $session->write([

                    'WhatIsInside' => 'littlebunny',
                    'CurrentFilter' => 'this is the filter'

                ]);
         
         // saving one of session vars
         $oldUserSession = $session->read('WhatIsInside');
         
         // calling function which suppose to delete the other session var (CurrentFilter) and leave WhatIsInside session var untouched
         $this->get('/UnitTests/reset_filters');
         
         // getting that other var from session
         $newUserSession = $session->read('WhatIsInside');

         // checking if function hasn't deleted the other session vars

         $this->assertSame($oldUserSession, $newUserSession);
}

But the test failed. 

I printed content of both sessions data before and after function.
Before function is giving me correct output but after calling the function it's giving me null.

Console output:

There was 1 failure:

1) App\Test\TestCase\Controller\UnitTestsControllerTest::testResetFilters

Failed asserting that null is identical to 'littlebunny'.

I don't what I did wrong and any help will be appreciated. 

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