Checkpoint - added many to many user group relations and test cerating users and groups to accept test

buisnesslogic/src/main/java/com/plannaplan/entities/User.java

@@ -1,13 +1,18 @@
 package com.plannaplan.entities;
 
 import java.sql.Timestamp;
+import java.util.HashSet;
+import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
+import javax.persistence.CascadeType;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
+import javax.persistence.JoinTable;
+import javax.persistence.ManyToMany;
 
 import com.plannaplan.models.UserApiResponse;
 import com.plannaplan.types.UserRoles;
@@ -33,6 +38,20 @@ public class User {
     private String refreshToken;
     private Timestamp tokenUsageDate;
     private Integer ranking;
+    @ManyToMany(cascade = CascadeType.ALL)
+    @JoinTable
+    private Set<Groups> studentRegisteredGrups;
+
+    public Set<Groups> getStudentRegisteredGrups() {
+        return this.studentRegisteredGrups;
+    }
+
+    public void claimGroup(Groups group) {
+        if (this.studentRegisteredGrups == null) {
+            this.studentRegisteredGrups = new HashSet<>();
+        }
+        this.studentRegisteredGrups.add(group);
+    }
 
     public User() {
     }