Make sure the database is not replaced while we make a backup of the service

Signed-off-by: Joas Schilling <coding@schilljs.com>

tests/lib/TestCase.php

@@ -128,6 +128,10 @@ abstract class TestCase extends \PHPUnit_Framework_TestCase {
 	}
 
 	protected function setUp() {
+		// overwrite the command bus with one we can run ourselves
+		$this->commandBus = new QueueBus();
+		$this->overwriteService('AsyncCommandBus', $this->commandBus);
+
 		// detect database access
 		self::$wasDatabaseAllowed = true;
 		if (!$this->IsDatabaseAccessAllowed()) {
@@ -140,10 +144,6 @@ abstract class TestCase extends \PHPUnit_Framework_TestCase {
 			});
 		}
 
-		// overwrite the command bus with one we can run ourselves
-		$this->commandBus = new QueueBus();
-		$this->overwriteService('AsyncCommandBus', $this->commandBus);
-
 		$traits = $this->getTestTraits();
 		foreach ($traits as $trait) {
 			$methodName = 'setUp' . basename(str_replace('\\', '/', $trait));