removed warnings

customer-work/src/test/java/com/customer/work/model/TestMailServerExtension.java

@@ -1,5 +1,6 @@
 package com.customer.work.model;
 
+import org.jspecify.annotations.NonNull;
 import org.junit.jupiter.api.extension.AfterEachCallback;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
 import org.junit.jupiter.api.extension.ExtensionContext;
@@ -7,12 +8,12 @@ import org.springframework.test.context.junit.jupiter.SpringExtension;
 
 public class TestMailServerExtension implements BeforeEachCallback, AfterEachCallback {
     @Override
-    public void beforeEach(ExtensionContext context) {
+    public void beforeEach(@NonNull ExtensionContext context) {
         getTestMailServer(context).setup();
     }
 
     @Override
-    public void afterEach(ExtensionContext context) {
+    public void afterEach(@NonNull ExtensionContext context) {
         getTestMailServer(context).stop();
     }