FluidTYPO3\Flux\Core::unregisterPipe PHP Method

    public static function unregisterPipe($typeOrClassName)
    {
        if (TRUE === in_array($typeOrClassName, self::$pipes)) {
            $index = array_search($typeOrClassName, self::$pipes);
            unset(self::$pipes[$index]);
        }
    }

 /**
  * @test
  */
 public function canAddAndRetrievePipes()
 {
     $fakeClass = 'MyFakeClass';
     Core::registerPipe($fakeClass);
     $this->assertContains($fakeClass, Core::getPipes());
     Core::unregisterPipe($fakeClass);
     $this->assertNotContains($fakeClass, Core::getPipes());
 }