diff --git a/app/src/test/java/ch/nuth/zhaw/exbox/ADS1_3_test.java b/app/src/test/java/ch/nuth/zhaw/exbox/ADS1_3_test.java
index 414be10..ff8850f 100644
--- a/app/src/test/java/ch/nuth/zhaw/exbox/ADS1_3_test.java
+++ b/app/src/test/java/ch/nuth/zhaw/exbox/ADS1_3_test.java
@@ -25,5 +25,12 @@ public class ADS1_3_test {
         test("[(])", false);
         test("[(3 +3)* 35 +3]* {3 +2}", true);
         test("[({3 +3)* 35} +3]* {3 +2}", false);
+        test("(", false);
+        test(")", false);
+        test("<(<>)>", true);
+        test("<(<)>>", false);
+        test("/* hallo */", true);
+        test("/*/* */", false);
+        test("/*", false);
     }
 }