Remove sample test case

As spotted by @orklah (thanks to them) the test was not
specifying the targeted php version (8.0) so fail was
expected.

tests/SomeTest.php

@@ -1,30 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-
-namespace Psalm\Tests;
-
-
-use Psalm\Context;
-
-class SomeTest extends TestCase
-{
-
-    public function testStuff()
-    {
-        $this->addFile(
-            'somefile.php',
-            '<?php
-                class A
-                {
-                }
-
-                $reflected_class = new ReflectionClass(A::class);
-                $reflected_class->getReflectionConstants(1);
-                '
-        );
-
-        $this->analyzeFile('somefile.php', new Context());
-    }
-}