diff --git a/src/test/java/SolutionTest.java b/src/test/java/SolutionTest.java
index c8470db..6008680 100644
--- a/src/test/java/SolutionTest.java
+++ b/src/test/java/SolutionTest.java
@@ -35,7 +35,7 @@ class SolutionTest {
 			redirectStreams(
 					new ByteArrayInputStream( input.getBytes( UTF_8 )),
 					new PrintStream( bos, true, UTF_8 ),
-					new PrintStream( new ByteArrayOutputStream(), true, UTF_8 )
+					oldErr
 			);
 			
 			// start time tracking
diff --git a/src/test/resources/testdata.csv b/src/test/resources/testdata.csv
index 057eed3..8597815 100644
--- a/src/test/resources/testdata.csv
+++ b/src/test/resources/testdata.csv
@@ -5,11 +5,15 @@
 (()),true
 []{},true
 {[]},true
+{(((({}))))},true
+()[]{}([{}]),true
 ()[()]({[()]})([]),true
 (,false
 ],false
 {],false
 (},false
 ([)],false
+{((((})))),false
 {(((([))))}],false
+{(((([[[[{{},false
 ()[()]({[[(])]})([]),false
\ No newline at end of file