Squiz/DisallowMultipleAssignments: rename test case file

Doing this to be able to create a test with a syntax error on separate
file.

Author: rodrigoprimo

src/Standards/Squiz/Tests/PHP/DisallowMultipleAssignmentsUnitTest.inc renamed to src/Standards/Squiz/Tests/PHP/DisallowMultipleAssignmentsUnitTest.1.inc

@@ -26,21 +26,29 @@ final class DisallowMultipleAssignmentsUnitTest extends AbstractSniffUnitTest
      * The key of the array should represent the line number and the value
      * should represent the number of errors that should occur on that line.
      *
+     * @param string $testFile The name of the test file to process.
+     *
      * @return array<int, int>
      */
-    public function getErrorList()
+    public function getErrorList($testFile='')
     {
-        return [
-            4  => 1,
-            5  => 2,
-            7  => 1,
-            9  => 1,
-            12 => 1,
-            14 => 1,
-            15 => 1,
-            79 => 1,
-            85 => 1,
-        ];
+        switch ($testFile) {
+        case 'DisallowMultipleAssignmentsUnitTest.1.inc':
+            return [
+                4  => 1,
+                5  => 2,
+                7  => 1,
+                9  => 1,
+                12 => 1,
+                14 => 1,
+                15 => 1,
+                79 => 1,
+                85 => 1,
+            ];
+
+        default:
+            return [];
+        }
 
     }//end getErrorList()