fixed Tests

src/test/java/de/rwu/easydrop/core/CoreTest.java

@@ -1,10 +1,12 @@
 package de.rwu.easydrop.core;
 
+import javax.naming.ConfigurationException;
+
 import org.junit.jupiter.api.Test;
 
 public class CoreTest {
     @Test
-    void testRunCore() {
+    void testRunCore() throws ConfigurationException{
         Core core1=new Core();
         core1.runCore();