adding test engine dependency

zpp-solver/mcts-solver/pom.xml

@@ -20,6 +20,11 @@
     <version>${melodic.version}</version>
 
     <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>eu.melodic</groupId>
             <artifactId>cp-parser</artifactId>