[5.4][PHP8.5] Using null as an array offset is now deprecated (unit tests) (joomla#46203)

https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_using_values_null_as_an_array_offset_and_when_calling_array_key_exists

Author: heelc29

tests/Unit/Libraries/Cms/MVC/Controller/BaseControllerTest.php

@@ -337,8 +337,10 @@ public function display($tpl = null)
         };
         $mvcFactory = $this->createStub(MVCFactoryInterface::class);
         $mvcFactory->method('createView')->willReturn($view);
+        $app = $this->createStub(CMSApplicationInterface::class);
+        $app->method('getName')->willReturn('Test');
 
-        $controller = new class (['base_path' => __DIR__], $mvcFactory, $this->createStub(CMSApplicationInterface::class), new Input()) extends BaseController {
+        $controller = new class (['base_path' => __DIR__], $mvcFactory, $app, new Input()) extends BaseController {
         };
 
         $this->assertEquals($view, $controller->getView('testGetView'));
@@ -407,6 +409,7 @@ public function getUser(): User
 
         $user = new User();
         $app  = $this->createStub(CMSApplicationInterface::class);
+        $app->method('getName')->willReturn('Test');
         $app->method('getIdentity')->willReturn($user);
 
         $controller = new class (['base_path' => __DIR__], $mvcFactory, $app, new Input()) extends BaseController {
@@ -467,8 +470,11 @@ public function getPaths()
      */
     public function testDisplay()
     {
+        $doc = $this->createStub(Document::class);
+        $doc->method('getType')->willReturn('html');
         $app = $this->createStub(CMSWebApplicationInterface::class);
-        $app->method('getDocument')->willReturn(new Document());
+        $app->method('getName')->willReturn('Test');
+        $app->method('getDocument')->willReturn($doc);
 
         $view             = new class (['name' => 'test']) extends AbstractView {
             public $value = null;
@@ -498,8 +504,11 @@ public function display($tpl = null)
      */
     public function testDisplayWithModel()
     {
+        $doc = $this->createStub(Document::class);
+        $doc->method('getType')->willReturn('html');
         $app = $this->createStub(CMSWebApplicationInterface::class);
-        $app->method('getDocument')->willReturn(new Document());
+        $app->method('getName')->willReturn('Test');
+        $app->method('getDocument')->willReturn($doc);
 
         $model = new class (['name' => 'test']) extends BaseModel {
         };

tests/Unit/Libraries/Cms/MVC/View/AbstractViewTest.php

@@ -148,7 +148,7 @@ public function display($tpl = null)
         };
         $view->set('unit', 'test');
 
-        $this->assertEquals('test', $view->get('unit'));
+        $this->assertEquals('test', $view->get('unit', ''));
     }
 
     /**