context: #region Copyright notice and license
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // http://github.com/jskeet/dotnet-protobufs/
  // Original C++/Java/Python code:
  // http://code.google.com/p/protobuf/
  //
  // 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.ProtocolBuffers.Descriptors;
  using Google.ProtocolBuffers.TestProtos;
  using NUnit.Framework;
  
  namespace Google.ProtocolBuffers
  {
      /// <summary>
      /// Tests for descriptors. (Not in its own namespace or broken up into individual classes as the
      /// size doesn't warrant it. On the other hand, this makes me feel a bit dirty...)
      /// </summary>
      public class DescriptorsTest
      {
          [Test]
          public void FileDescriptor()
          {
              FileDescriptor file = Unittest.Descriptor;
  
              Assert.AreEqual("google/protobuf/unittest.proto", file.Name);
              Assert.AreEqual("protobuf_unittest", file.Package);
  
              Assert.AreEqual("UnittestProto", file.Options.JavaOuterClassname);
              Assert.AreEqual("google/protobuf/unittest.proto", file.Proto.Name);
  
              // unittest.proto doesn't have any public imports, but unittest_import.proto does.
              Assert.AreEqual(0, file.PublicDependencies.Count);
              Assert.AreEqual(1, UnittestImport.Descriptor.PublicDependencies.Count);
              Assert.AreEqual(UnittestImportPublic.Descriptor, UnittestImport.Descriptor.PublicDependencies[0]);
  
              Assert.AreEqual(1, file.Dependencies.Count);
              Assert.AreEqual(UnittestImport.Descriptor, file.Dependencies[0]);
  
              MessageDescriptor messageType = TestAllTypes.Descriptor;
              Assert.AreEqual(messageType, file.MessageTypes[0]);
              Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
              Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
              Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest.TestAllTypes"));
              for (int i = 0; i < file.MessageTypes.Count; i++)
              {
                  Assert.AreEqual(i, file.MessageTypes[i].Index);
              }
  
              Assert.AreEqual(file.EnumTypes[0], file.FindTypeByName<EnumDescriptor>("ForeignEnum"));
              Assert.Null(file.FindTypeByName<EnumDescriptor>("NoSuchType"));
              Assert.Null(file.FindTypeByName<EnumDescriptor>("protobuf_unittest.ForeignEnum"));
              Assert.AreEqual(1, UnittestImport.Descriptor.EnumTypes.Count);
              Assert.AreEqual("ImportEnum", UnittestImport.Descriptor.EnumTypes[0].Name);
              for (int i = 0; i < file.EnumTypes.Count; i++)
              {
                  Assert.AreEqual(i, file.EnumTypes[i].Index);
              }
  
              FieldDescriptor extension = Unittest.OptionalInt32Extension.Descriptor;
              Assert.AreEqual(extension, file.Extensions[0]);
              Assert.AreEqual(extension, file.FindTypeByName<FieldDescriptor>("optional_int32_extension"));
              Assert.Null(file.FindTypeByName<FieldDescriptor>("no_such_ext"));
              Assert.Null(file.FindTypeByName<FieldDescriptor>("protobuf_unittest.optional_int32_extension"));
              Assert.AreEqual(0, UnittestImport.Descriptor.Extensions.Count);
              for (int i = 0; i < file.Extensions.Count; i++)
              {
                  Assert.AreEqual(i, file.Extensions[i].Index);
              }
          }
  
          [Test]
          public void MessageDescriptor()
          {
              MessageDescriptor messageType = TestAllTypes.Descriptor;
              MessageDescriptor nestedType = TestAllTypes.Types.NestedMessage.Descriptor;
  
              Assert.AreEqual("TestAllTypes", messageType.Name);
              Assert.AreEqual("protobuf_unittest.TestAllTypes", messageType.FullName);
              Assert.AreEqual(Unittest.Descriptor, messageType.File);
              Assert.Null(messageType.ContainingType);
              Assert.AreEqual(DescriptorProtos.MessageOptions.DefaultInstance, messageType.Options);
              Assert.AreEqual("TestAllTypes", messageType.Proto.Name);
  
              Assert.AreEqual("NestedMessage", nestedType.Name);
              Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedMessage", nestedType.FullName);
              Assert.AreEqual(Unittest.Descriptor, nestedType.File);
              Assert.AreEqual(messageType, nestedType.ContainingType);
  
              FieldDescriptor field = messageType.Fields[0];
              Assert.AreEqual("optional_int32", field.Name);
              Assert.AreEqual(field, messageType.FindDescriptor<FieldDescriptor>("optional_int32"));
              Assert.Null(messageType.FindDescriptor<FieldDescriptor>("no_such_field"));
              Assert.AreEqual(field, messageType.FindFieldByNumber(1));
              Assert.Null(messageType.FindFieldByNumber(571283));
              for (int i = 0; i < messageType.Fields.Count; i++)
              {
                  Assert.AreEqual(i, messageType.Fields[i].Index);
              }
  
              Assert.AreEqual(nestedType, messageType.NestedTypes[0]);
              Assert.AreEqual(nestedType, messageType.FindDescriptor<MessageDescriptor>("NestedMessage"));
              Assert.Null(messageType.FindDescriptor<MessageDescriptor>("NoSuchType"));
              for (int i = 0; i < messageType.NestedTypes.Count; i++)
              {
                  Assert.AreEqual(i, messageType.NestedTypes[i].Index);
              }
  
              Assert.AreEqual(messageType.EnumTypes[0], messageType.FindDescriptor<EnumDescriptor>("NestedEnum"));
              Assert.Null(messageType.FindDescriptor<EnumDescriptor>("NoSuchType"));
              for (int i = 0; i < messageType.EnumTypes.Count; i++)
              {
                  Assert.AreEqual(i, messageType.EnumTypes[i].Index);
              }
          }
  
          [Test]
          public void FieldDescriptor()
          {
              MessageDescriptor messageType = TestAllTypes.Descriptor;
              FieldDescriptor primitiveField = messageType.FindDescriptor<FieldDescriptor>("optional_int32");
              FieldDescriptor enumField = messageType.FindDescriptor<FieldDescriptor>("optional_nested_enum");
              FieldDescriptor messageField = messageType.FindDescriptor<FieldDescriptor>("optional_foreign_message");
              FieldDescriptor cordField = messageType.FindDescriptor<FieldDescriptor>("optional_cord");
              FieldDescriptor extension = Unittest.OptionalInt32Extension.Descriptor;
              FieldDescriptor nestedExtension = TestRequired.Single.Descriptor;
  
              Assert.AreEqual("optional_int32", primitiveField.Name);
              Assert.AreEqual("protobuf_unittest.TestAllTypes.optional_int32",
                              primitiveField.FullName);
              Assert.AreEqual(1, primitiveField.FieldNumber);
              Assert.AreEqual(messageType, primitiveField.ContainingType);
              Assert.AreEqual(Unittest.Descriptor, primitiveField.File);
              Assert.AreEqual(FieldType.Int32, primitiveField.FieldType);
              Assert.AreEqual(MappedType.Int32, primitiveField.MappedType);
              Assert.AreEqual(DescriptorProtos.FieldOptions.DefaultInstance, primitiveField.Options);
              Assert.IsFalse(primitiveField.IsExtension);
              Assert.AreEqual("optional_int32", primitiveField.Proto.Name);
  
              Assert.AreEqual("optional_nested_enum", enumField.Name);
              Assert.AreEqual(FieldType.Enum, enumField.FieldType);
              Assert.AreEqual(MappedType.Enum, enumField.MappedType);
              // Assert.AreEqual(TestAllTypes.Types.NestedEnum.DescriptorProtoFile, enumField.EnumType);
  
              Assert.AreEqual("optional_foreign_message", messageField.Name);
              Assert.AreEqual(FieldType.Message, messageField.FieldType);
              Assert.AreEqual(MappedType.Message, messageField.MappedType);
              Assert.AreEqual(ForeignMessage.Descriptor, messageField.MessageType);
  
              Assert.AreEqual("optional_cord", cordField.Name);
              Assert.AreEqual(FieldType.String, cordField.FieldType);
              Assert.AreEqual(MappedType.String, cordField.MappedType);
              Assert.AreEqual(DescriptorProtos.FieldOptions.Types.CType.CORD, cordField.Options.Ctype);
  
              Assert.AreEqual("optional_int32_extension", extension.Name);
              Assert.AreEqual("protobuf_unittest.optional_int32_extension", extension.FullName);
              Assert.AreEqual(1, extension.FieldNumber);
              Assert.AreEqual(TestAllExtensions.Descriptor, extension.ContainingType);
              Assert.AreEqual(Unittest.Descriptor, extension.File);
              Assert.AreEqual(FieldType.Int32, extension.FieldType);
              Assert.AreEqual(MappedType.Int32, extension.MappedType);
              Assert.AreEqual(DescriptorProtos.FieldOptions.DefaultInstance,
                              extension.Options);
              Assert.IsTrue(extension.IsExtension);
              Assert.AreEqual(null, extension.ExtensionScope);
              Assert.AreEqual("optional_int32_extension", extension.Proto.Name);
  
              Assert.AreEqual("single", nestedExtension.Name);
              Assert.AreEqual("protobuf_unittest.TestRequired.single",
                              nestedExtension.FullName);
              Assert.AreEqual(TestRequired.Descriptor,
                              nestedExtension.ExtensionScope);
          }
  
          [Test]
          public void FieldDescriptorLabel()
          {
              FieldDescriptor requiredField =
                  TestRequired.Descriptor.FindDescriptor<FieldDescriptor>("a");
              FieldDescriptor optionalField =
                  TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("optional_int32");
              FieldDescriptor repeatedField =
                  TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("repeated_int32");
  
              Assert.IsTrue(requiredField.IsRequired);
              Assert.IsFalse(requiredField.IsRepeated);
              Assert.IsFalse(optionalField.IsRequired);
              Assert.IsFalse(optionalField.IsRepeated);
              Assert.IsFalse(repeatedField.IsRequired);
              Assert.IsTrue(repeatedField.IsRepeated);
          }
          [Test]
          public void FieldDescriptorDefault()
          {
              MessageDescriptor d = TestAllTypes.Descriptor;
              Assert.IsFalse(d.FindDescriptor<FieldDescriptor>("optional_int32").HasDefaultValue);
              Assert.AreEqual(0, d.FindDescriptor<FieldDescriptor>("optional_int32").DefaultValue);
              Assert.IsTrue(d.FindDescriptor<FieldDescriptor>("default_int32").HasDefaultValue);
              Assert.AreEqual(41, d.FindDescriptor<FieldDescriptor>("default_int32").DefaultValue);
  
              d = TestExtremeDefaultValues.Descriptor;
              Assert.AreEqual(TestExtremeDefaultValues.DefaultInstance.EscapedBytes,
                  d.FindDescriptor<FieldDescriptor>("escaped_bytes").DefaultValue);
  
              Assert.AreEqual(uint.MaxValue, d.FindDescriptor<FieldDescriptor>("large_uint32").DefaultValue);
              Assert.AreEqual(ulong.MaxValue, d.FindDescriptor<FieldDescriptor>("large_uint64").DefaultValue);
          }
          [Test]
          public void EnumDescriptor()
          {
              // Note: this test is a bit different to the Java version because there's no static way of getting to the descriptor
              EnumDescriptor enumType = Unittest.Descriptor.FindTypeByName<EnumDescriptor>("ForeignEnum");
              EnumDescriptor nestedType = TestAllTypes.Descriptor.FindDescriptor<EnumDescriptor>("NestedEnum");
  
              Assert.AreEqual("ForeignEnum", enumType.Name);
              Assert.AreEqual("protobuf_unittest.ForeignEnum", enumType.FullName);
              Assert.AreEqual(Unittest.Descriptor, enumType.File);
              Assert.Null(enumType.ContainingType);
              Assert.AreEqual(DescriptorProtos.EnumOptions.DefaultInstance,
                              enumType.Options);
  
              Assert.AreEqual("NestedEnum", nestedType.Name);
              Assert.AreEqual("protobuf_unittest.TestAllTypes.NestedEnum",
                              nestedType.FullName);
              Assert.AreEqual(Unittest.Descriptor, nestedType.File);
              Assert.AreEqual(TestAllTypes.Descriptor, nestedType.ContainingType);
  
              EnumValueDescriptor value = enumType.FindValueByName("FOREIGN_FOO");
              Assert.AreEqual(value, enumType.Values[0]);
              Assert.AreEqual("FOREIGN_FOO", value.Name);
              Assert.AreEqual(4, value.Number);
              Assert.AreEqual((int) ForeignEnum.FOREIGN_FOO, value.Number);
              Assert.AreEqual(value, enumType.FindValueByNumber(4));
              Assert.Null(enumType.FindValueByName("NO_SUCH_VALUE"));
              for (int i = 0; i < enumType.Values.Count; i++)
              {
                  Assert.AreEqual(i, enumType.Values[i].Index);
              }
          }
          
  
          [Test]
          public void CustomOptions()
          {
              MessageDescriptor descriptor = TestMessageWithCustomOptions.Descriptor;
              Assert.IsTrue(descriptor.Options.HasExtension(UnittestCustomOptions.MessageOpt1));
              Assert.AreEqual(-56, descriptor.Options.GetExtension(UnittestCustomOptions.MessageOpt1));
  
  
  
gt:             FieldDescriptor field = descriptor.FindFieldByName("field1");