Unit test: fix tests failing

I'm not completely sure why, but when I tried to run the unit tests, most were failing.

This minor tweak in how PHPCS is instantiated fixes it. It also removes the need for the `getSniffFiles()` method as there is only one sniff in this standard anyway.

Author: jrfnl

VariableAnalysis/Tests/BaseTestCase.php

@@ -7,14 +7,17 @@
 use PHP_CodeSniffer\Config;
 
 class BaseTestCase extends TestCase {
-  public function prepareLocalFileForSniffs($sniffFiles, $fixtureFile) {
-    $config = new Config(['--standard=VariableAnalysis']);
-    $ruleset = new Ruleset($config);
-    if (! is_array($sniffFiles)) {
-      $sniffFiles = [$sniffFiles];
-    }
-    $ruleset->registerSniffs($sniffFiles, [], []);
-    $ruleset->populateTokenListeners();
+  const STANDARD_NAME = 'VariableAnalysis';
+  const SNIFF_NAME = 'VariableAnalysis.CodeAnalysis.VariableAnalysis';
+
+  public function prepareLocalFileForSniffs($fixtureFile) {
+    $config            = new Config();
+    $config->cache     = false;
+    $config->standards = [self::STANDARD_NAME];
+    $config->sniffs    = [self::SNIFF_NAME];
+    $config->ignored   = [];
+    $ruleset           = new Ruleset($config);
+
     if (! file_exists($fixtureFile)) {
       throw new \Exception('Fixture file does not exist: ' . $fixtureFile);
     }
@@ -35,10 +38,6 @@ public function getErrorLineNumbersFromFile(LocalFile $phpcsFile) {
     return $this->getLineNumbersFromMessages($phpcsFile->getErrors());
   }
 
-  public function getSniffFiles() {
-    return [__DIR__ . '/../../VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php'];
-  }
-
   public function getFixture($fixtureFilename) {
     return __DIR__ . '/CodeAnalysis/fixtures/' . $fixtureFilename;
   }