Generic/UselessOverridingMethod: rename test case file

To add more tests with syntax errors in separate files in subsequent
commits.

Author: rodrigoprimo

src/Standards/Generic/Tests/CodeAnalysis/UselessOverridingMethodUnitTest.inc renamed to src/Standards/Generic/Tests/CodeAnalysis/UselessOverridingMethodUnitTest.1.inc

@@ -22,4 +22,4 @@ class Bar {
     public function export($a, $b = null) {
         return parent::export($a);
     }
-}
+}

src/Standards/Generic/Tests/CodeAnalysis/UselessOverridingMethodUnitTest.php

@@ -41,14 +41,21 @@ public function getErrorList()
      * The key of the array should represent the line number and the value
      * should represent the number of warnings that should occur on that line.
      *
+     * @param string $testFile The name of the file being tested.
+     *
      * @return array<int, int>
      */
-    public function getWarningList()
+    public function getWarningList($testFile='')
     {
-        return [
-            4  => 1,
-            16 => 1,
-        ];
+        switch ($testFile) {
+        case 'UselessOverridingMethodUnitTest.1.inc':
+            return [
+                4  => 1,
+                16 => 1,
+            ];
+        default:
+            return [];
+        }
 
     }//end getWarningList()