Calling the parent implementation is mandatory.

corphi · xabbuh · commit fba2da2d28a8 · 2016-03-26T10:33:10.000+01:00
Among other things, `parent::setUp()` will call `getExtensions()` that uses the private variables.
diff --git a/cookbook/form/unit_testing.rst b/cookbook/form/unit_testing.rst
@@ -133,6 +133,8 @@ make sure the ``FormRegistry`` uses the created instance::
         {
             // mock any dependencies
             $this->entityManager = $this->getMock('Doctrine\Common\Persistence\ObjectManager');
+
+            parent::setUp();
         }
 
         protected function getExtensions()

Original file line number	Diff line number	Diff line change
@@ -133,6 +133,8 @@ make sure the ``FormRegistry`` uses the created instance::
`133`	`133`	`{`
`134`	`134`	`// mock any dependencies`
`135`	`135`	`$this->entityManager = $this->getMock('Doctrine\Common\Persistence\ObjectManager');`
	`136`	`+`
	`137`	`+ parent::setUp();`
`136`	`138`	`}`
`137`	`139`
`138`	`140`	`protected function getExtensions()`