AbstractMethodUnitTest: allow for select tests to use tabs in the test case file

An individual test can set the `$tabWidth` property in the test file to overwrite the default value.

Author: jrfnl

tests/Core/AbstractMethodUnitTest.php

@@ -28,6 +28,15 @@ abstract class AbstractMethodUnitTest extends TestCase
      */
     protected static $fileExtension = 'inc';
 
+    /**
+     * The tab width setting to use when tokenizing the file.
+     *
+     * This allows for test case files to use a different tab width than the default.
+     *
+     * @var integer
+     */
+    protected static $tabWidth = 4;
+
     /**
      * The \PHP_CodeSniffer\Files\File object containing the parsed contents of the test case file.
      *
@@ -63,7 +72,10 @@ public static function initializeFile()
         self::setStaticConfigProperty('configData', ['report_width' => 80]);
         self::setStaticConfigProperty('configDataFile', '');
 
-        $config  = new Config();
+        $config = new Config();
+        // Also set a tab-width to enable testing tab-replaced vs `orig_content`.
+        $config->tabWidth = static::$tabWidth;
+
         $ruleset = new Ruleset($config);
 
         // Default to a file with the same name as the test class. Extension is property based.