Switch to assert4j (#159)

Switch to AssertJ

Author: dadoonet

pom.xml

@@ -87,6 +87,8 @@
             <version>${jackson.version}</version>
             <scope>test</scope>
         </dependency>
+
+        <!-- Junit -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
@@ -99,6 +101,11 @@
             <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>3.27.3</version>
+        </dependency>
 
         <!-- Logging dependencies -->
         <dependency>