Validate URI is not null (Azure#19433)

Author: JoshLove-msft

sdk/eventgrid/Azure.Messaging.EventGrid/src/Customization/EventGridPublisherClient.cs

@@ -41,6 +41,7 @@ public EventGridPublisherClient(Uri endpoint, AzureKeyCredential credential)
         /// <param name="options">The set of options to use for configuring the client.</param>
         public EventGridPublisherClient(Uri endpoint, AzureKeyCredential credential, EventGridPublisherClientOptions options)
         {
+            Argument.AssertNotNull(endpoint, nameof(endpoint));
             Argument.AssertNotNull(credential, nameof(credential));
             options ??= new EventGridPublisherClientOptions();
             _uriBuilder = new RequestUriBuilder();
@@ -59,6 +60,7 @@ public EventGridPublisherClient(Uri endpoint, AzureKeyCredential credential, Eve
         /// <param name="options">The set of options to use for configuring the client.</param>
         public EventGridPublisherClient(Uri endpoint, AzureSasCredential credential, EventGridPublisherClientOptions options = default)
         {
+            Argument.AssertNotNull(endpoint, nameof(endpoint));
             Argument.AssertNotNull(credential, nameof(credential));
             options ??= new EventGridPublisherClientOptions();
             _uriBuilder = new RequestUriBuilder();

sdk/eventgrid/Azure.Messaging.EventGrid/tests/EventGridClientTests.cs

@@ -0,0 +1,33 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using NUnit.Framework;
+
+namespace Azure.Messaging.EventGrid.Tests
+{
+    public class EventGridClientTests
+    {
+        [Test]
+        public void ConstructorValidatesUriNotNull()
+        {
+            Assert.That(
+                () => new EventGridPublisherClient(null, new AzureKeyCredential("credential")),
+                Throws.InstanceOf<ArgumentNullException>());
+            Assert.That(
+                () => new EventGridPublisherClient(null, new AzureSasCredential("credential")),
+                Throws.InstanceOf<ArgumentNullException>());
+        }
+
+        [Test]
+        public void ConstructorValidatesKeyNotNull()
+        {
+            Assert.That(
+                () => new EventGridPublisherClient(new Uri("http://localHost"), (AzureKeyCredential)null),
+                Throws.InstanceOf<ArgumentNullException>());
+            Assert.That(
+                () => new EventGridPublisherClient(new Uri("http://localHost"), (AzureSasCredential)null),
+                Throws.InstanceOf<ArgumentNullException>());
+        }
+    }
+}