test: run in separate processes due to static usage

Author: Greg Bowler

src/LogConfig.php

@@ -50,7 +50,7 @@ public static function addHandler(LogHandler $handler, string $logLevel = null):
 	}
 
 	private static function ensureAtLeastOneHandler():void {
-		if(!isset(self::$handlers)) {
+		if(empty(self::$handlers)) {
 			self::$handlers = array();
 			array_push(
 				self::$handlers,

test/phpunit/LogConfigTest.php

@@ -1,12 +1,13 @@
 <?php
 namespace Gt\Logger\Test;
 
-use _HumbugBox373c0874430e\Psr\Log\LogLevel;
 use Gt\Logger\LogConfig;
 use Gt\Logger\LogHandler\FileHandler;
 use Gt\Logger\LogHandler\StdOutHandler;
+use Gt\Logger\LogLevel;
 use PHPUnit\Framework\TestCase;
 
+/** @runTestsInSeparateProcesses  */
 class LogConfigTest extends TestCase {
 	public function testGetHandlers_returnsDefaultWhenEmpty():void {
 		$handlerList = LogConfig::getHandlers();