diff --git a/tests/system/Log/LoggerTest.php b/tests/system/Log/LoggerTest.php
index 965dd130634b..a35d1eae6ded 100644
--- a/tests/system/Log/LoggerTest.php
+++ b/tests/system/Log/LoggerTest.php
@@ -419,4 +419,18 @@ public function testFilenameCleaning()
 		$this->assertEquals($expected, $logger->cleanup($ohoh));
 	}
 
+	//--------------------------------------------------------------------
+
+	public function testDetermineFileNoStackTrace()
+	{
+		$config = new LoggerConfig();
+		$logger = new Logger($config);
+
+		$expected = [
+			'unknown',
+			'unknown',
+		];
+
+		$this->assertEquals($expected, $logger->determineFile());
+	}
 }