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diff --git a/src/csharp/Grpc.Tools.Tests/ProtoCompileBasicTest.cs b/src/csharp/Grpc.Tools.Tests/ProtoCompileBasicTest.cs
new file mode 100644
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+++ b/src/csharp/Grpc.Tools.Tests/ProtoCompileBasicTest.cs
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+#region Copyright notice and license
+
+// Copyright 2018 gRPC 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.
+
+#endregion
+
+using System.Reflection;  // UWYU: Object.GetType() extension.
+using Microsoft.Build.Framework;
+using Moq;
+using NUnit.Framework;
+
+namespace Grpc.Tools.Tests {
+  public class ProtoCompileBasicTest {
+    // Mock task class that stops right before invoking protoc.
+    public class ProtoCompileTestable : ProtoCompile {
+      public string LastPathToTool { get; private set; }
+      public string[] LastResponseFile { get; private set; }
+
+      protected override int ExecuteTool(string pathToTool,
+                                         string response,
+                                         string commandLine) {
+        // We should never be using command line commands.
+        Assert.That(commandLine, Is.Null | Is.Empty);
+
+        // Must receive a path to tool
+        Assert.That(pathToTool, Is.Not.Null & Is.Not.Empty);
+        Assert.That(response, Is.Not.Null & Does.EndWith("\n"));
+
+        LastPathToTool = pathToTool;
+        LastResponseFile = response.Remove(response.Length - 1).Split('\n');
+
+        // Do not run the tool, but pretend it ran successfully.
+        return 0;
+      }
+    };
+
+    protected Mock<IBuildEngine> _mockEngine;
+    protected ProtoCompileTestable _task;
+
+    [SetUp]
+    public void SetUp() {
+      _mockEngine = new Mock<IBuildEngine>();
+      _task = new ProtoCompileTestable {
+        BuildEngine = _mockEngine.Object
+      };
+    }
+
+    [TestCase("ProtoBuf")]
+    [TestCase("Generator")]
+    [TestCase("OutputDir")]
+    [Description("We trust MSBuild to initialize these properties.")]
+    public void RequiredAttributePresentOnProperty(string prop) {
+      var pinfo = _task.GetType()?.GetProperty(prop);
+      Assert.NotNull(pinfo);
+      Assert.That(pinfo, Has.Attribute<RequiredAttribute>());
+    }
+  };
+}