diff --git a/core-java/pom.xml b/core-java/pom.xml
index 7920566a1a..633656857e 100644
--- a/core-java/pom.xml
+++ b/core-java/pom.xml
@@ -162,12 +162,6 @@
             <version>${avaitility.version}</version>
             <scope>test</scope>
         </dependency>
-		<dependency>
-		    <groupId>org.springframework</groupId>
-		    <artifactId>spring-core</artifactId>
-		    <version>${spring-core.version}</version>
-		    <scope>test</scope>
-		</dependency>
 
         <dependency>
             <groupId>commons-codec</groupId>
@@ -433,8 +427,6 @@
         <mockito.version>2.8.9</mockito.version>
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>
-        <spring-core.version>4.3.10.RELEASE</spring-core.version>
-
 
         <!-- maven plugins -->
         <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
diff --git a/core-java/src/test/java/org/baeldung/java/io/JavaDirectoryDeleteUnitTest.java b/libraries/src/test/java/com/baeldung/java/io/JavaDirectoryDeleteUnitTest.java
similarity index 92%
rename from core-java/src/test/java/org/baeldung/java/io/JavaDirectoryDeleteUnitTest.java
rename to libraries/src/test/java/com/baeldung/java/io/JavaDirectoryDeleteUnitTest.java
index b1f800eef3..0820a2b2bd 100644
--- a/core-java/src/test/java/org/baeldung/java/io/JavaDirectoryDeleteUnitTest.java
+++ b/libraries/src/test/java/com/baeldung/java/io/JavaDirectoryDeleteUnitTest.java
@@ -1,4 +1,4 @@
-package org.baeldung.java.io;
+package com.baeldung.java.io;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -68,11 +68,13 @@ public class JavaDirectoryDeleteUnitTest {
     boolean deleteDirectory(File directoryToBeDeleted) {
         File[] allContents = directoryToBeDeleted.listFiles();
 
-        for (File file : allContents) {
-            if (file.isDirectory()) {
-                deleteDirectory(file);
-            } else {
-                file.delete();
+        if (allContents != null) {
+            for (File file : allContents) {
+                if (file.isDirectory()) {
+                    deleteDirectory(file);
+                } else {
+                    file.delete();
+                }
             }
         }