Delete useless test

Author: sebastianbergmann

tests/_files/SingletonClass.php

@@ -25,7 +25,6 @@
 use PHPUnit\TestFixture\ExceptionWithThrowable;
 use PHPUnit\TestFixture\FinalClass;
 use PHPUnit\TestFixture\InterfaceWithSemiReservedMethodName;
-use PHPUnit\TestFixture\SingletonClass;
 use stdClass;
 use Throwable;
 
@@ -219,13 +218,6 @@ public function testGetMockClassMethodsForNonExistantClass(): void
         $mock = $this->generator->mockClassMethods('Tux', true, true);
     }
 
-    public function testGetMockForSingletonWithReflectionSuccess(): void
-    {
-        $mock = $this->generator->getMock(SingletonClass::class, ['doSomething'], [], '', false);
-
-        $this->assertInstanceOf(SingletonClass::class, $mock);
-    }
-
     public function testExceptionIsRaisedForMutuallyExclusiveOptions(): void
     {
         $this->expectException(RuntimeException::class);