add test case to prove issue

Author: marac19901990

tests/unit/Framework/Assert/AssertNotEqualsTest.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace PHPUnit\Framework;
+
+class AssertNotEqualsTest extends TestCase
+{
+    public function testConfusingMessagesForLogicalNot()
+    {
+        $a = 'test contains something';
+        $b = 'test contains something';
+
+        $this->assertNotEquals($b, $a);
+    }
+}