Improve corpus query serialization test.

Change-Id: I6f648d542bc8b2cc369ac12c45b53c24c0aed3f8
Reviewed-on: https://korap.ids-mannheim.de/gerrit/c/KorAP/Koral/+/9468
Reviewed-by: margaretha <margaretha@ids-mannheim.de>
diff --git a/src/test/java/de/ids_mannheim/korap/query/test/QuerySerializerTest.java b/src/test/java/de/ids_mannheim/korap/query/test/QuerySerializerTest.java
index c5e5e87..0f701a3 100644
--- a/src/test/java/de/ids_mannheim/korap/query/test/QuerySerializerTest.java
+++ b/src/test/java/de/ids_mannheim/korap/query/test/QuerySerializerTest.java
@@ -76,7 +76,7 @@
 		String expectedOutput = "{\"collection\":{\"@type\":\"koral:doc\","
 				+ "\"match\":\"match:eq\",\"value\":\"WPD17\",\"key\":"
 				+ "\"corpusSigle\"},\"@context\":\"http://korap.ids-mannheim.de"
-				+ "/ns/koral/0.3/context.jsonld\"}\n" + System.lineSeparator();
-		assertEquals(expectedOutput, outputStream.toString());
+				+ "/ns/koral/0.3/context.jsonld\"}";
+		assertEquals(expectedOutput, outputStream.toString().trim());
 	}
 }