Add a newUser test

pom.xml

@@ -220,6 +220,12 @@
         <!-- ... -->
     </repositories>
     <dependencies>
+        <dependency>
+            <groupId>com.github.seeseemelk</groupId>
+            <artifactId>MockBukkit-v1.16</artifactId>
+            <version>0.25.0</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>co.aikar</groupId>
             <artifactId>acf-bukkit</artifactId> <!-- Don't forget to replace this -->