Generic/TraitNameSuffix: improve code coverage

- Add a separate test case file with a live coding/parse error test.
- Add a new test with a comment and whitespaces in unexpected places.

Author: rodrigoprimo

src/Standards/Generic/Tests/NamingConventions/TraitNameSuffixUnitTest.1.inc

@@ -5,3 +5,7 @@ trait MissingTraitSuffix {} // Error.
 trait GoodTrait {}
 
 trait SuffixCaseIsNotEnforced_tRaIt {}
+
+trait
+    /*comment*/
+    AnotherInvalidTraitName {} // Error.

src/Standards/Generic/Tests/NamingConventions/TraitNameSuffixUnitTest.2.inc

@@ -0,0 +1,7 @@
+<?php
+
+// Intentional parse error (no trait name).
+// This should be the only test in this file.
+// Testing that the sniff is *not* triggered.
+
+trait

src/Standards/Generic/Tests/NamingConventions/TraitNameSuffixUnitTest.php

@@ -35,6 +35,7 @@ public function getErrorList($testFile='')
         case 'TraitNameSuffixUnitTest.1.inc':
             return [
                 3 => 1,
+                9 => 1,
             ];
 
         default: