Unit tests: set the PHPCS_IGNORE_TESTS environment variable from th…

…e bootstrap

... which makes it independent of the dev environment of individual devs, making it more stable and less fiddly.

phpunit-bootstrap.php

@@ -41,6 +41,8 @@
 if ($phpcsDir !== false && \is_dir($phpcsDir)) {
     if (\file_exists($phpcsDir . $ds . 'tests' . $ds . 'bootstrap.php')) {
         require_once $phpcsDir . $ds . 'tests' . $ds . 'bootstrap.php'; // PHPUnit 6.x+ support as of PHPCS 3.1.0.
+    } elseif (\file_exists($phpcsDir . $ds . 'autoload.php')) {
+        require_once $phpcsDir . $ds . 'autoload.php'; // PHPCS < 3.1.0.
     }
 } else {
     echo 'Uh oh... can\'t find PHPCS.
@@ -53,5 +55,29 @@
     die(1);
 }
 
+/*
+ * Set the PHPCS_IGNORE_TEST environment variable to ignore tests from other standards.
+ * Ref: https://github.com/squizlabs/PHP_CodeSniffer/pull/1146
+ */
+$phpcsDevtoolsStandards = [
+    'PHPCSDebug' => true,
+];
+
+$allStandards   = PHP_CodeSniffer\Util\Standards::getInstalledStandards();
+$allStandards[] = 'Generic';
+
+$standardsToIgnore = [];
+foreach ($allStandards as $standard) {
+    if (isset($phpcsDevtoolsStandards[$standard]) === true) {
+        continue;
+    }
+
+    $standardsToIgnore[] = $standard;
+}
+
+$standardsToIgnoreString = \implode(',', $standardsToIgnore);
+\putenv("PHPCS_IGNORE_TESTS={$standardsToIgnoreString}");
+
 // Clean up.
 unset($ds, $phpcsDir, $composerPHPCSPath);
+unset($ds, $phpcsDir, $composerPHPCSPath, $allStandards, $standardsToIgnore, $standard, $standardsToIgnoreString);

phpunit.xml.dist

@@ -13,12 +13,4 @@
             <directory suffix="UnitTest.php">./PHPCSDebug/Tests/</directory>
         </testsuite>
     </testsuites>
-
-    <php>
-        <!-- This line prevents issues with PHPCS trying to load sniff files for
-             standards which we aren't testing.
-             Ref: https://github.com/squizlabs/PHP_CodeSniffer/pull/1146 -->
-        <env name="PHPCS_IGNORE_TESTS" value="PHPCompatibility"/>
-    </php>
 </phpunit>
-