--- /dev/null
+/*
+ * Copyright (c) 2023 PANTHEON.tech, s.r.o. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.mdsal.singleton.common.api;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+class ServiceGroupIdentifierTest {
+ @Test
+ void rejectEmptyValue() {
+ final var ex = assertThrows(IllegalArgumentException.class, () -> new ServiceGroupIdentifier(""));
+ assertEquals("Value must not be blank", ex.getMessage());
+ }
+
+ @Test
+ void rejectNullValue() {
+ assertThrows(NullPointerException.class, () -> new ServiceGroupIdentifier(null));
+ }
+}