diff --git a/protocol/src/test/java/com/zfoo/protocol/collection/HashSetTest.java b/protocol/src/test/java/com/zfoo/protocol/collection/HashSetTest.java
new file mode 100644
index 00000000..c5e2a8bd
--- /dev/null
+++ b/protocol/src/test/java/com/zfoo/protocol/collection/HashSetTest.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed 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 com.zfoo.protocol.collection;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashSet;
+
+/**
+ * @author godotg
+ */
+public class HashSetTest {
+
+    @Test
+    public void byteTest() {
+        var set = new HashSet<Byte>();
+        var mySet = new HashSetByte();
+        for (var i = 0; i < 100; i++) {
+            set.add((byte) i);
+            mySet.add((byte) i);
+        }
+        set.add(Byte.MAX_VALUE);
+        set.add(Byte.MIN_VALUE);
+        mySet.add(Byte.MAX_VALUE);
+        mySet.add(Byte.MIN_VALUE);
+        Assert.assertEquals(set, mySet);
+        Assert.assertEquals(set.size(), mySet.size());
+        Assert.assertFalse(mySet.isEmpty());
+        for (var ele : set) {
+            Assert.assertTrue(mySet.contains(ele));
+        }
+        for (var ele : mySet) {
+            Assert.assertTrue(set.contains(ele));
+        }
+        for (var ele : set) {
+            mySet.remove(ele);
+        }
+        Assert.assertTrue(mySet.isEmpty());
+    }
+
+    @Test
+    public void shortTest() {
+        var set = new HashSet<Short>();
+        var mySet = new HashSetShort();
+        for (var i = 0; i < 1000; i++) {
+            set.add((short) i);
+            mySet.add((short) i);
+        }
+        set.add(Short.MAX_VALUE);
+        set.add(Short.MIN_VALUE);
+        mySet.add(Short.MAX_VALUE);
+        mySet.add(Short.MIN_VALUE);
+        Assert.assertEquals(set, mySet);
+        Assert.assertEquals(set.size(), mySet.size());
+        Assert.assertFalse(mySet.isEmpty());
+        for (var ele : set) {
+            Assert.assertTrue(mySet.contains(ele));
+        }
+        for (var ele : mySet) {
+            Assert.assertTrue(set.contains(ele));
+        }
+        for (var ele : set) {
+            mySet.remove(ele);
+        }
+        Assert.assertTrue(mySet.isEmpty());
+    }
+
+    @Test
+    public void intTest() {
+        var set = new HashSet<Integer>();
+        var mySet = new HashSetInt();
+        for (var i = 0; i < 1000; i++) {
+            set.add(i);
+            mySet.add(i);
+        }
+        set.add(Integer.MAX_VALUE);
+        set.add(Integer.MIN_VALUE);
+        mySet.add(Integer.MAX_VALUE);
+        mySet.add(Integer.MIN_VALUE);
+        Assert.assertEquals(set, mySet);
+        Assert.assertEquals(set.size(), mySet.size());
+        Assert.assertFalse(mySet.isEmpty());
+        for (var ele : set) {
+            Assert.assertTrue(mySet.contains(ele));
+        }
+        for (var ele : mySet) {
+            Assert.assertTrue(set.contains(ele));
+        }
+        for (var ele : set) {
+            mySet.remove(ele);
+        }
+        Assert.assertTrue(mySet.isEmpty());
+    }
+
+    @Test
+    public void longTest() {
+        var set = new HashSet<Long>();
+        var mySet = new HashSetLong();
+        for (var i = 0; i < 1000; i++) {
+            set.add((long) i);
+            mySet.add(i);
+        }
+        set.add(Long.MAX_VALUE);
+        set.add(Long.MIN_VALUE);
+        mySet.add(Long.MAX_VALUE);
+        mySet.add(Long.MIN_VALUE);
+        Assert.assertEquals(set, mySet);
+        Assert.assertEquals(set.size(), mySet.size());
+        Assert.assertFalse(mySet.isEmpty());
+        for (var ele : set) {
+            Assert.assertTrue(mySet.contains(ele));
+        }
+        for (var ele : mySet) {
+            Assert.assertTrue(set.contains(ele));
+        }
+        for (var ele : set) {
+            mySet.remove(ele);
+        }
+        Assert.assertTrue(mySet.isEmpty());
+    }
+}