v4.0.0 (#1357)

Source/MQTTnet.Tests/MqttPacketIdentifierProvider_Tests.cs

@@ -0,0 +1,36 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.Client;
+
+namespace MQTTnet.Tests
+{
+    [TestClass]
+    public class MqttPacketIdentifierProvider_Tests
+    {
+        [TestMethod]
+        public void Reset()
+        {
+            var p = new MqttPacketIdentifierProvider();
+            Assert.AreEqual(1, p.GetNextPacketIdentifier());
+            Assert.AreEqual(2, p.GetNextPacketIdentifier());
+            p.Reset();
+            Assert.AreEqual(1, p.GetNextPacketIdentifier());
+        }
+
+        [TestMethod]
+        public void ReachBoundaries()
+        {
+            var p = new MqttPacketIdentifierProvider();
+
+            for (ushort i = 0; i < ushort.MaxValue; i++)
+            {
+                Assert.AreEqual(i + 1, p.GetNextPacketIdentifier());
+            }
+
+            Assert.AreEqual(1, p.GetNextPacketIdentifier());
+        }
+    }
+}