diff --git a/core-java-12/src/test/java/com/baeldung/StringAPITest.java b/core-java-modules/core-java-12/src/test/java/com/baeldung/string/StringAPITest.java
old mode 100755
new mode 100644
similarity index 97%
rename from core-java-12/src/test/java/com/baeldung/StringAPITest.java
rename to core-java-modules/core-java-12/src/test/java/com/baeldung/string/StringAPITest.java
index 7b68fbb52c..f26a25ed79
--- a/core-java-12/src/test/java/com/baeldung/StringAPITest.java
+++ b/core-java-modules/core-java-12/src/test/java/com/baeldung/string/StringAPITest.java
@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.string;
 
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.MatcherAssert.assertThat;