created GruppTest

src/test/java/mops/gruppen2/entities/GruppeTest.java

@@ -0,0 +1,12 @@
+package mops.gruppen2.entities;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class GruppeTest {
+
+    @Test
+    void applyEvent() {
+    }
+}