Feature/mqttv5 subscriptions server (#1246)

* Add support for RetainHandling. * Add support for No Local. * Add support for _SubscriptionIdentifier_. * Add more Unit Tests. * Update docs.
2026-10-19 19:13:11 +08:00 · 2021-09-23 20:30:43 +02:00
parent feb53e78c6
commit c756a4092f
83 changed files with 2032 additions and 1237 deletions
@@ -0,0 +1,66 @@
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.Client;
+using MQTTnet.Formatter;
+using MQTTnet.Protocol;
+
+namespace MQTTnet.Tests.Server
+{
+    [TestClass]
+    public sealed class Retain_Handling_Tests : BaseTestClass
+    {
+        [TestMethod]
+        public Task Send_At_Subscribe()
+        {
+            return ExecuteTest(MqttRetainHandling.SendAtSubscribe, 1, 2, 3);
+        }
+        
+        [TestMethod]
+        public Task Do_Not_Send_On_Subscribe()
+        {
+            return ExecuteTest(MqttRetainHandling.DoNotSendOnSubscribe, 0, 1, 1);
+        }
+        
+        [TestMethod]
+        public Task Send_At_Subscribe_If_New_Subscription_Only()
+        {
+            return ExecuteTest(MqttRetainHandling.SendAtSubscribeIfNewSubscriptionOnly, 1, 2, 2);
+        }
+
+        async Task ExecuteTest(
+            MqttRetainHandling retainHandling,
+            int expectedCountAfterSubscribe,
+            int expectedCountAfterSecondPublish,
+            int expectedCountAfterSecondSubscribe)
+        {
+            using (var testEnvironment = CreateTestEnvironment(MqttProtocolVersion.V500))
+            {
+                await testEnvironment.StartServer();
+
+                var client1 = await testEnvironment.ConnectClient();
+                await client1.PublishAsync("Topic", "Payload", true);
+
+                await LongTestDelay();
+                
+                var client2 = await testEnvironment.ConnectClient();
+                var applicationMessageHandler = testEnvironment.CreateApplicationMessageHandler(client2);
+                
+                var topicFilter = testEnvironment.Factory.CreateTopicFilterBuilder().WithTopic("Topic").WithRetainHandling(retainHandling).Build();
+                await client2.SubscribeAsync(topicFilter);
+                await LongTestDelay();
+
+                applicationMessageHandler.AssertReceivedCountEquals(expectedCountAfterSubscribe);
+                
+                await client1.PublishAsync("Topic", "Payload", true);
+                await LongTestDelay();
+                
+                applicationMessageHandler.AssertReceivedCountEquals(expectedCountAfterSecondPublish);
+                
+                await client2.SubscribeAsync(topicFilter);
+                await LongTestDelay();
+
+                applicationMessageHandler.AssertReceivedCountEquals(expectedCountAfterSecondSubscribe);
+            }
+        }
+    }
+}