diff --git a/testing-modules/testing/pom.xml b/testing-modules/testing/pom.xml
index 2804a94244..6f185d3b4c 100644
--- a/testing-modules/testing/pom.xml
+++ b/testing-modules/testing/pom.xml
@@ -34,6 +34,7 @@
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj-core.version}</version>
+            <scope>test</scope>
         </dependency>
 
         <dependency>
diff --git a/testing-modules/testing/src/main/java/com/baeldung/testing/assertj/custom/Assertions.java b/testing-modules/testing/src/test/java/com/baeldung/testing/assertj/custom/Assertions.java
similarity index 100%
rename from testing-modules/testing/src/main/java/com/baeldung/testing/assertj/custom/Assertions.java
rename to testing-modules/testing/src/test/java/com/baeldung/testing/assertj/custom/Assertions.java
diff --git a/testing-modules/testing/src/main/java/com/baeldung/testing/assertj/custom/CarAssert.java b/testing-modules/testing/src/test/java/com/baeldung/testing/assertj/custom/CarAssert.java
similarity index 100%
rename from testing-modules/testing/src/main/java/com/baeldung/testing/assertj/custom/CarAssert.java
rename to testing-modules/testing/src/test/java/com/baeldung/testing/assertj/custom/CarAssert.java
diff --git a/testing-modules/testing/src/main/java/com/baeldung/testing/assertj/custom/PersonAssert.java b/testing-modules/testing/src/test/java/com/baeldung/testing/assertj/custom/PersonAssert.java
similarity index 100%
rename from testing-modules/testing/src/main/java/com/baeldung/testing/assertj/custom/PersonAssert.java
rename to testing-modules/testing/src/test/java/com/baeldung/testing/assertj/custom/PersonAssert.java