diff --git a/src/test/java/mops/gruppen2/GroupBuilder.java b/src/test/java/mops/gruppen2/GroupBuilder.java
new file mode 100644
index 0000000..154c27c
--- /dev/null
+++ b/src/test/java/mops/gruppen2/GroupBuilder.java
@@ -0,0 +1,154 @@
+package mops.gruppen2;
+
+import mops.gruppen2.domain.event.AddMemberEvent;
+import mops.gruppen2.domain.event.CreateGroupEvent;
+import mops.gruppen2.domain.event.DestroyGroupEvent;
+import mops.gruppen2.domain.event.Event;
+import mops.gruppen2.domain.event.KickMemberEvent;
+import mops.gruppen2.domain.event.SetDescriptionEvent;
+import mops.gruppen2.domain.event.SetInviteLinkEvent;
+import mops.gruppen2.domain.event.SetLimitEvent;
+import mops.gruppen2.domain.event.SetTitleEvent;
+import mops.gruppen2.domain.event.SetTypeEvent;
+import mops.gruppen2.domain.event.UpdateRoleEvent;
+import mops.gruppen2.domain.model.group.Group;
+import mops.gruppen2.domain.model.group.Role;
+import mops.gruppen2.domain.model.group.Type;
+import mops.gruppen2.domain.model.group.User;
+import mops.gruppen2.domain.model.group.wrapper.Description;
+import mops.gruppen2.domain.model.group.wrapper.Limit;
+import mops.gruppen2.domain.model.group.wrapper.Link;
+import mops.gruppen2.domain.model.group.wrapper.Title;
+import mops.gruppen2.infrastructure.GroupCache;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+import static mops.gruppen2.TestHelper.uuid;
+
+public final class GroupBuilder {
+
+    private final UUID groupid;
+    private int version;
+    private final GroupCache groupCache;
+    private final Group group = Group.EMPTY();
+
+    private GroupBuilder(GroupCache cache, UUID id) {
+        groupCache = cache;
+        groupid = id;
+    }
+
+    /**
+     * Erzeugt neuen GruppenBuilder mit Cache und ID
+     */
+    public static GroupBuilder get(GroupCache cache, int id) {
+        return new GroupBuilder(cache, uuid(id));
+    }
+
+    /**
+     * Initialisiert Gruppe mit Id, Creator und Zeit
+     */
+    public GroupBuilder group() {
+        return apply(new CreateGroupEvent(groupid, "TEST", LocalDateTime.now()));
+    }
+
+    /**
+     * Initialisiert TestAdmin
+     */
+    public GroupBuilder testadmin() {
+        apply(new AddMemberEvent(groupid, "TEST", "TEST", new User("TEST")));
+        return apply(new UpdateRoleEvent(groupid, "TEST", "TEST", Role.ADMIN));
+    }
+
+    /**
+     * Fügt Nutzer hinzu
+     */
+    public GroupBuilder add(String userid) {
+        return apply(new AddMemberEvent(groupid, "TEST", userid, new User(userid)));
+    }
+
+    /**
+     * Entfernt Nutzer
+     */
+    public GroupBuilder kick(String userid) {
+        return apply(new KickMemberEvent(groupid, "TEST", userid));
+    }
+
+    public GroupBuilder limit(int i) {
+        return apply(new SetLimitEvent(groupid, "TEST", new Limit(i)));
+    }
+
+    /**
+     * Macht Nutzer zu Admin
+     */
+    public GroupBuilder admin(String userid) {
+        return apply(new UpdateRoleEvent(groupid, "TEST", userid, Role.ADMIN));
+    }
+
+    /**
+     * Macht Nutzer zu regulärem
+     */
+    public GroupBuilder regular(String userid) {
+        return apply(new UpdateRoleEvent(groupid, "TEST", userid, Role.REGULAR));
+    }
+
+    /**
+     * Macht Gruppe öffentlich
+     */
+    public GroupBuilder publik() {
+        return apply(new SetTypeEvent(groupid, "TEST", Type.PUBLIC));
+    }
+
+    /**
+     * Macht Gruppe privat
+     */
+    public GroupBuilder privat() {
+        return apply(new SetTypeEvent(groupid, "TEST", Type.PRIVATE));
+    }
+
+    /**
+     * Macht Gruppe zu Veranstaltung
+     */
+    public GroupBuilder lecture() {
+        return apply(new SetTypeEvent(groupid, "TEST", Type.LECTURE));
+    }
+
+    /**
+     * Setzt Beschreibung
+     */
+    public GroupBuilder desc(String descr) {
+        return apply(new SetDescriptionEvent(groupid, "TEST", new Description(descr)));
+    }
+
+    /**
+     * Setzt Titel
+     */
+    public GroupBuilder title(String titl) {
+        return apply(new SetTitleEvent(groupid, "TEST", new Title(titl)));
+    }
+
+    /**
+     * Setzt Link
+     */
+    public GroupBuilder link(int lnk) {
+        return apply(new SetInviteLinkEvent(groupid, "TEST", new Link(uuid(lnk).toString())));
+    }
+
+    /**
+     * Löscht Gruppe
+     */
+    public GroupBuilder destroy() {
+        return apply(new DestroyGroupEvent(groupid, "TEST"));
+    }
+
+    public Group build() {
+        return group;
+    }
+
+    private GroupBuilder apply(Event event) {
+        version++;
+        event.init(version);
+        event.apply(group, groupCache);
+        return this;
+    }
+}
diff --git a/src/test/java/mops/gruppen2/TestHelper.java b/src/test/java/mops/gruppen2/TestHelper.java
new file mode 100644
index 0000000..7895df3
--- /dev/null
+++ b/src/test/java/mops/gruppen2/TestHelper.java
@@ -0,0 +1,15 @@
+package mops.gruppen2;
+
+import java.util.UUID;
+
+public final class TestHelper {
+
+    public static UUID uuid(int id) {
+        String num = String.valueOf(id);
+        String string = "00000000-0000-0000-0000-";
+        string += "0".repeat(12 - num.length());
+        string += num;
+
+        return UUID.fromString(string);
+    }
+}