[GitHub] [kafka] jolshan commented on a change in pull request #9454: KAFKA-10618: Add UUID class, use in protocols

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jolshan commented on a change in pull request #9454:
URL: https://github.com/apache/kafka/pull/9454#discussion_r508597656



##########
File path: clients/src/test/java/org/apache/kafka/common/UUIDTest.java
##########
@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.common;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+public class UUIDTest {
+
+    @Test
+    public void testSignificantBits() {
+        UUID id = new UUID(34L, 98L);
+
+        assertEquals(id.getMostSignificantBits(), 34L);
+        assertEquals(id.getLeastSignificantBits(), 98L);
+    }
+
+    @Test
+    public void testUUIDEquality() {
+        UUID id1 = new UUID(12L, 13L);
+        UUID id2 = new UUID(12L, 13L);
+        UUID id3 = new UUID(24L, 38L);
+
+        assertEquals(UUID.ZERO_UUID, UUID.ZERO_UUID);
+        assertEquals(id1, id2);
+        assertNotEquals(id1, id3);
+
+        assertEquals(UUID.ZERO_UUID.hashCode(), UUID.ZERO_UUID.hashCode());
+        assertEquals(id1.hashCode(), id2.hashCode());
+        assertNotEquals(id1.hashCode(), id3.hashCode());
+    }
+
+    @Test
+    public void testStringConversion() {
+        UUID id = UUID.randomUUID();

Review comment:
       I thought about that, but since the likelihood we would get the zero/sentinel id is so low even if they were allowed, I didn't know if the test would be useful. The sentinel ID is also a private variable, but I suppose I could just construct a new one if we want to test. 




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