diff --git a/src/main/java/dev/httpmarco/netline/client/NetClientHandler.java b/src/main/java/dev/httpmarco/netline/client/NetClientHandler.java
index 4a44ee1..2279dee 100644
--- a/src/main/java/dev/httpmarco/netline/client/NetClientHandler.java
+++ b/src/main/java/dev/httpmarco/netline/client/NetClientHandler.java
@@ -5,6 +5,7 @@
 import dev.httpmarco.netline.packet.common.BroadcastPacket;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.NotNull;
 
 public final class NetClientHandler extends NetCompHandler {
 
@@ -36,7 +37,7 @@ public void handshakeChannel(NetChannel netChannel) {
     }
 
     @Override
-    public void broadcastDefinition(NetChannel incoming, BroadcastPacket packet) {
+    public void broadcastDefinition(NetChannel incoming, @NotNull BroadcastPacket packet) {
         netClient.callTracking(incoming, packet.packet());
     }
 }
diff --git a/src/test/java/dev/httpmarco/netline/tests/SecurityListTest.java b/src/test/java/dev/httpmarco/netline/tests/SecurityListTest.java
index c32de86..f45bcb6 100644
--- a/src/test/java/dev/httpmarco/netline/tests/SecurityListTest.java
+++ b/src/test/java/dev/httpmarco/netline/tests/SecurityListTest.java
@@ -14,7 +14,7 @@
 
 @TestMethodOrder(MethodOrderer.OrderAnnotation.class)
 @DisplayName("3 - White-/Blacklist test")
-public class SecurityListTest {
+public final class SecurityListTest {
 
     private static NetServer server;
 
@@ -28,7 +28,7 @@ public static void createTestSetup() {
     @Test
     @Order(1)
     @DisplayName("3.1 Test hostname whitelist")
-    public void testHostNameWhitelist() {
+    public void testHostNameWhitelist() throws InterruptedException {
         var result = new AtomicBoolean(false);
         var whitelistedIp = "127.0.0.2";
 
@@ -38,6 +38,8 @@ public void testHostNameWhitelist() {
         var testClient = Net.line().client();
         testClient.bootSync();
 
+        Thread.sleep(1000);
+
         if(testClient.state() == NetClientState.CONNECTED) {
             testClient.closeSync();
             assert false;
@@ -53,7 +55,7 @@ public void testHostNameWhitelist() {
     @Test
     @Order(2)
     @DisplayName("3.2 Test hostname blacklist")
-    public void testBlacklist() {
+    public void testBlacklist() throws InterruptedException {
         var result = new AtomicBoolean(false);
         var blockedIp = "127.0.0.1";
 
@@ -64,6 +66,8 @@ public void testBlacklist() {
         var testClient = Net.line().client();
         testClient.bootSync();
 
+        Thread.sleep(1000);
+
         if(testClient.state() == NetClientState.CONNECTED) {
             testClient.closeSync();
             assert false;