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diff --git a/csharp/src/Google.Protobuf.Test/Reflection/DescriptorDeclarationTest.cs b/csharp/src/Google.Protobuf.Test/Reflection/DescriptorDeclarationTest.cs
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+++ b/csharp/src/Google.Protobuf.Test/Reflection/DescriptorDeclarationTest.cs
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+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2018 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+
+using Google.Protobuf.Reflection;
+using NUnit.Framework;
+using System.Linq;
+using System.Reflection;
+
+namespace Google.Protobuf.Test.Reflection
+{
+    // In reality this isn't a test for DescriptorDeclaration so much as the way they're loaded.
+    public class DescriptorDeclarationTest
+    {
+        static readonly FileDescriptor unitTestProto3Descriptor = LoadProtos();
+
+        [Test]
+        public void ServiceComments()
+        {
+            var service = unitTestProto3Descriptor.FindTypeByName<ServiceDescriptor>("TestService");
+            Assert.NotNull(service.Declaration);
+            Assert.AreEqual(" This is a test service\n", service.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void MethodComments()
+        {
+            var service = unitTestProto3Descriptor.FindTypeByName<ServiceDescriptor>("TestService");
+            var method = service.FindMethodByName("Foo");
+            Assert.NotNull(method.Declaration);
+            Assert.AreEqual(" This is a test method\n", method.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void MessageComments()
+        {
+            var message = unitTestProto3Descriptor.FindTypeByName<MessageDescriptor>("CommentMessage");
+            Assert.NotNull(message.Declaration);
+            Assert.AreEqual(" This is a leading comment\n", message.Declaration.LeadingComments);
+            Assert.AreEqual(new[] { " This is leading detached comment 1\n", " This is leading detached comment 2\n" },
+                message.Declaration.LeadingDetachedComments);
+        }
+
+        [Test]
+        public void EnumComments()
+        {
+            var descriptor = unitTestProto3Descriptor.FindTypeByName<EnumDescriptor>("CommentEnum");
+            Assert.NotNull(descriptor.Declaration);
+            Assert.AreEqual(" Leading enum comment\n", descriptor.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void NestedMessageComments()
+        {
+            var outer = unitTestProto3Descriptor.FindTypeByName<MessageDescriptor>("CommentMessage");
+            var nested = outer.FindDescriptor<MessageDescriptor>("NestedCommentMessage");
+            Assert.NotNull(nested.Declaration);
+            Assert.AreEqual(" Leading nested message comment\n", nested.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void NestedEnumComments()
+        {
+            var outer = unitTestProto3Descriptor.FindTypeByName<MessageDescriptor>("CommentMessage");
+            var nested = outer.FindDescriptor<EnumDescriptor>("NestedCommentEnum");
+            Assert.NotNull(nested.Declaration);
+            Assert.AreEqual(" Leading nested enum comment\n", nested.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void FieldComments()
+        {
+            var message = unitTestProto3Descriptor.FindTypeByName<MessageDescriptor>("CommentMessage");
+            var field = message.FindFieldByName("text");
+            Assert.NotNull(field.Declaration);
+            Assert.AreEqual(" Leading field comment\n", field.Declaration.LeadingComments);
+            Assert.AreEqual(" Trailing field comment\n", field.Declaration.TrailingComments);
+        }
+
+        [Test]
+        public void NestedMessageFieldComments()
+        {
+            var outer = unitTestProto3Descriptor.FindTypeByName<MessageDescriptor>("CommentMessage");
+            var nested = outer.FindDescriptor<MessageDescriptor>("NestedCommentMessage");
+            var field = nested.FindFieldByName("nested_text");
+            Assert.NotNull(field.Declaration);
+            Assert.AreEqual(" Leading nested message field comment\n", field.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void EnumValueComments()
+        {
+            var enumDescriptor = unitTestProto3Descriptor.FindTypeByName<EnumDescriptor>("CommentEnum");
+            var value = enumDescriptor.FindValueByName("ZERO_VALUE");
+            Assert.NotNull(value.Declaration);
+            Assert.AreEqual(" Zero value comment\n", value.Declaration.LeadingComments);
+        }
+
+        [Test]
+        public void NestedEnumValueComments()
+        {
+            var outer = unitTestProto3Descriptor.FindTypeByName<MessageDescriptor>("CommentMessage");
+            var nested = outer.FindDescriptor<EnumDescriptor>("NestedCommentEnum");
+            var value = nested.FindValueByName("ZERO_VALUE");
+            Assert.NotNull(value.Declaration);
+            Assert.AreEqual(" Zero value comment\n", value.Declaration.LeadingComments);
+        }
+
+        private static FileDescriptor LoadProtos()
+        {
+            var type = typeof(DescriptorDeclarationTest);
+            // TODO: Make this simpler :)
+            FileDescriptorSet descriptorSet;
+            using (var stream = type.GetTypeInfo().Assembly.GetManifestResourceStream($"Google.Protobuf.Test.testprotos.pb"))
+            {
+                descriptorSet = FileDescriptorSet.Parser.ParseFrom(stream);
+            }
+            var byteStrings = descriptorSet.File.Select(f => f.ToByteString()).ToList();
+            var descriptors = FileDescriptor.BuildFromByteStrings(byteStrings);
+            return descriptors.Single(d => d.Name == "unittest_proto3.proto");
+        }
+    }
+}