csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs - third_party/github/protocolbuffers/protobuf - Git at Google

 #region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 #endregion

 using Google.Protobuf.TestProtos;
 using LegacyFeaturesUnittest;
 using NUnit.Framework;
 using ProtobufUnittest;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using UnitTest.Issues.TestProtos;
 using static Google.Protobuf.Reflection.FeatureSet.Types;
 using proto2 = Google.Protobuf.TestProtos.Proto2;

 namespace Google.Protobuf.Reflection
 {
     /// <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_GeneratedCode()
         {
             TestFileDescriptor(
                 UnittestProto3Reflection.Descriptor,
                 UnittestImportProto3Reflection.Descriptor,
                 UnittestImportPublicProto3Reflection.Descriptor);
         }

         [Test]
         public void FileDescriptor_BuildFromByteStrings()
         {
             // The descriptors have to be supplied in an order such that all the
             // dependencies come before the descriptors depending on them.
             var descriptorData = new List<ByteString>
             {
                 UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
                 UnittestImportProto3Reflection.Descriptor.SerializedData,
                 UnittestProto3Reflection.Descriptor.SerializedData
             };
             var converted = FileDescriptor.BuildFromByteStrings(descriptorData);
             Assert.AreEqual(3, converted.Count);
             TestFileDescriptor(converted[2], converted[1], converted[0]);
         }

         [Test]
         public void FileDescriptor_BuildFromByteStrings_WithExtensionRegistry()
         {
             var extension = UnittestCustomOptionsProto3Extensions.MessageOpt1;

             var byteStrings = new[]
             {
                 DescriptorReflection.Descriptor.Proto.ToByteString(),
                 UnittestCustomOptionsProto3Reflection.Descriptor.Proto.ToByteString()
             };
             var registry = new ExtensionRegistry { extension };

             var descriptor = FileDescriptor.BuildFromByteStrings(byteStrings, registry).Last();
             var message = descriptor.MessageTypes.Single(t => t.Name == nameof(TestMessageWithCustomOptions));
             var extensionValue = message.GetOptions().GetExtension(extension);
             Assert.AreEqual(-56, extensionValue);
         }

         private void TestFileDescriptor(FileDescriptor file, FileDescriptor importedFile, FileDescriptor importedPublicFile)
         {
             Assert.AreEqual("csharp/protos/unittest_proto3.proto", file.Name);
             Assert.AreEqual("protobuf_unittest3", file.Package);

             Assert.AreEqual("UnittestProto", file.Proto.Options.JavaOuterClassname);
             Assert.AreEqual("csharp/protos/unittest_proto3.proto", file.Proto.Name);

             // unittest_proto3.proto doesn't have any public imports, but unittest_import_proto3.proto does.
             Assert.AreEqual(0, file.PublicDependencies.Count);
             Assert.AreEqual(1, importedFile.PublicDependencies.Count);
             Assert.AreEqual(importedPublicFile, importedFile.PublicDependencies[0]);

             Assert.AreEqual(1, file.Dependencies.Count);
             Assert.AreEqual(importedFile, file.Dependencies[0]);

             Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
             Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest3.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_unittest3.ForeignEnum"));
             Assert.AreEqual(1, importedFile.EnumTypes.Count);
             Assert.AreEqual("ImportEnum", importedFile.EnumTypes[0].Name);
             for (int i = 0; i < file.EnumTypes.Count; i++)
             {
                 Assert.AreEqual(i, file.EnumTypes[i].Index);
             }

             Assert.AreEqual(10, file.SerializedData[0]);
             TestDescriptorToProto(file.ToProto, file.Proto);
         }

         [Test]
         public void FileDescriptor_BuildFromByteStrings_MissingDependency()
         {
             var descriptorData = new List<ByteString>
             {
                 UnittestImportProto3Reflection.Descriptor.SerializedData,
                 UnittestProto3Reflection.Descriptor.SerializedData,
             };
             // This will fail, because we're missing UnittestImportPublicProto3Reflection
             Assert.Throws<ArgumentException>(() => FileDescriptor.BuildFromByteStrings(descriptorData));
         }

         [Test]
         public void FileDescriptor_BuildFromByteStrings_DuplicateNames()
         {
             var descriptorData = new List<ByteString>
             {
                 UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
                 UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
             };
             // This will fail due to the same name being used twice
             Assert.Throws<ArgumentException>(() => FileDescriptor.BuildFromByteStrings(descriptorData));
         }

         [Test]
         public void FileDescriptor_BuildFromByteStrings_IncorrectOrder()
         {
             var descriptorData = new List<ByteString>
             {
                 UnittestProto3Reflection.Descriptor.SerializedData,
                 UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
                 UnittestImportProto3Reflection.Descriptor.SerializedData
             };
             // This will fail, because the dependencies should come first
             Assert.Throws<ArgumentException>(() => FileDescriptor.BuildFromByteStrings(descriptorData));

         }

         [Test]
         public void MessageDescriptorFromGeneratedCodeFileDescriptor()
         {
             var file = UnittestProto3Reflection.Descriptor;

             MessageDescriptor messageType = TestAllTypes.Descriptor;
             Assert.AreSame(typeof(TestAllTypes), messageType.ClrType);
             Assert.AreSame(TestAllTypes.Parser, messageType.Parser);
             Assert.AreEqual(messageType, file.MessageTypes[0]);
             Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
         }

         [Test]
         public void MessageDescriptor()
         {
             MessageDescriptor messageType = TestAllTypes.Descriptor;
             MessageDescriptor nestedType = TestAllTypes.Types.NestedMessage.Descriptor;

             Assert.AreEqual("TestAllTypes", messageType.Name);
             Assert.AreEqual("protobuf_unittest3.TestAllTypes", messageType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, messageType.File);
             Assert.IsNull(messageType.ContainingType);
             Assert.IsNull(messageType.Proto.Options);

             Assert.AreEqual("TestAllTypes", messageType.Name);

             Assert.AreEqual("NestedMessage", nestedType.Name);
             Assert.AreEqual("protobuf_unittest3.TestAllTypes.NestedMessage", nestedType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, nestedType.File);
             Assert.AreEqual(messageType, nestedType.ContainingType);

             FieldDescriptor field = messageType.Fields.InDeclarationOrder()[0];
             Assert.AreEqual("single_int32", field.Name);
             Assert.AreEqual(field, messageType.FindDescriptor<FieldDescriptor>("single_int32"));
             Assert.Null(messageType.FindDescriptor<FieldDescriptor>("no_such_field"));
             Assert.AreEqual(field, messageType.FindFieldByNumber(1));
             Assert.Null(messageType.FindFieldByNumber(571283));
             var fieldsInDeclarationOrder = messageType.Fields.InDeclarationOrder();
             for (int i = 0; i < fieldsInDeclarationOrder.Count; i++)
             {
                 Assert.AreEqual(i, fieldsInDeclarationOrder[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);
             }
             TestDescriptorToProto(messageType.ToProto, messageType.Proto);
         }

         [Test]
         public void MessageDescriptor_IsMapEntry()
         {
             var testMapMessage = TestMap.Descriptor;
             Assert.False(testMapMessage.IsMapEntry);
             Assert.True(testMapMessage.Fields[1].MessageType.IsMapEntry);
         }

         [Test]
         public void FieldDescriptor_GeneratedCode()
         {
             TestFieldDescriptor(UnittestProto3Reflection.Descriptor, TestAllTypes.Descriptor, ForeignMessage.Descriptor, ImportMessage.Descriptor);
         }

         [Test]
         public void FieldDescriptor_BuildFromByteStrings()
         {
             // The descriptors have to be supplied in an order such that all the
             // dependencies come before the descriptors depending on them.
             var descriptorData = new List<ByteString>
             {
                 UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
                 UnittestImportProto3Reflection.Descriptor.SerializedData,
                 UnittestProto3Reflection.Descriptor.SerializedData
             };
             var converted = FileDescriptor.BuildFromByteStrings(descriptorData);
             TestFieldDescriptor(
                 converted[2],
                 converted[2].FindTypeByName<MessageDescriptor>("TestAllTypes"),
                 converted[2].FindTypeByName<MessageDescriptor>("ForeignMessage"),
                 converted[1].FindTypeByName<MessageDescriptor>("ImportMessage"));
         }

         public void TestFieldDescriptor(
             FileDescriptor unitTestProto3Descriptor,
             MessageDescriptor testAllTypesDescriptor,
             MessageDescriptor foreignMessageDescriptor,
             MessageDescriptor importMessageDescriptor)
         {
             FieldDescriptor primitiveField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_int32");
             FieldDescriptor enumField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_nested_enum");
             FieldDescriptor foreignMessageField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_foreign_message");
             FieldDescriptor importMessageField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_import_message");
             FieldDescriptor fieldInOneof = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("oneof_string");

             Assert.AreEqual("single_int32", primitiveField.Name);
             Assert.AreEqual("protobuf_unittest3.TestAllTypes.single_int32",
                             primitiveField.FullName);
             Assert.AreEqual(1, primitiveField.FieldNumber);
             Assert.AreEqual(testAllTypesDescriptor, primitiveField.ContainingType);
             Assert.AreEqual(unitTestProto3Descriptor, primitiveField.File);
             Assert.AreEqual(FieldType.Int32, primitiveField.FieldType);
             Assert.IsNull(primitiveField.Proto.Options);

             Assert.AreEqual("single_nested_enum", enumField.Name);
             Assert.AreEqual(FieldType.Enum, enumField.FieldType);
             Assert.AreEqual(testAllTypesDescriptor.EnumTypes[0], enumField.EnumType);

             Assert.AreEqual("single_foreign_message", foreignMessageField.Name);
             Assert.AreEqual(FieldType.Message, foreignMessageField.FieldType);
             Assert.AreEqual(foreignMessageDescriptor, foreignMessageField.MessageType);

             Assert.AreEqual("single_import_message", importMessageField.Name);
             Assert.AreEqual(FieldType.Message, importMessageField.FieldType);
             Assert.AreEqual(importMessageDescriptor, importMessageField.MessageType);

             // For a field in a regular onoef, ContainingOneof and RealContainingOneof should be the same.
             Assert.AreEqual("oneof_field", fieldInOneof.ContainingOneof.Name);
             Assert.AreSame(fieldInOneof.ContainingOneof, fieldInOneof.RealContainingOneof);

             TestDescriptorToProto(primitiveField.ToProto, primitiveField.Proto);
             TestDescriptorToProto(enumField.ToProto, enumField.Proto);
             TestDescriptorToProto(foreignMessageField.ToProto, foreignMessageField.Proto);
             TestDescriptorToProto(fieldInOneof.ToProto, fieldInOneof.Proto);
         }

         [Test]
         public void FieldDescriptorLabel()
         {
             FieldDescriptor singleField =
                 TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("single_int32");
             FieldDescriptor repeatedField =
                 TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("repeated_int32");

             Assert.IsFalse(singleField.IsRepeated);
             Assert.IsTrue(repeatedField.IsRepeated);
         }

         [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 = UnittestProto3Reflection.Descriptor.FindTypeByName<EnumDescriptor>("ForeignEnum");
             EnumDescriptor nestedType = TestAllTypes.Descriptor.FindDescriptor<EnumDescriptor>("NestedEnum");

             Assert.AreEqual("ForeignEnum", enumType.Name);
             Assert.AreEqual("protobuf_unittest3.ForeignEnum", enumType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, enumType.File);
             Assert.Null(enumType.ContainingType);
             Assert.Null(enumType.Proto.Options);

             Assert.AreEqual("NestedEnum", nestedType.Name);
             Assert.AreEqual("protobuf_unittest3.TestAllTypes.NestedEnum",
                             nestedType.FullName);
             Assert.AreEqual(UnittestProto3Reflection.Descriptor, nestedType.File);
             Assert.AreEqual(TestAllTypes.Descriptor, nestedType.ContainingType);

             EnumValueDescriptor value = enumType.FindValueByName("FOREIGN_FOO");
             Assert.AreEqual(value, enumType.Values[1]);
             Assert.AreEqual("FOREIGN_FOO", value.Name);
             Assert.AreEqual(4, value.Number);
             Assert.AreEqual((int) ForeignEnum.ForeignFoo, 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);
             }
             TestDescriptorToProto(enumType.ToProto, enumType.Proto);
             TestDescriptorToProto(nestedType.ToProto, nestedType.Proto);
         }

         [Test]
         public void OneofDescriptor()
         {
             OneofDescriptor descriptor = TestAllTypes.Descriptor.FindDescriptor<OneofDescriptor>("oneof_field");
             Assert.IsFalse(descriptor.IsSynthetic);
             Assert.AreEqual("oneof_field", descriptor.Name);
             Assert.AreEqual("protobuf_unittest3.TestAllTypes.oneof_field", descriptor.FullName);

             var expectedFields = new[] {
                 TestAllTypes.OneofBytesFieldNumber,
                 TestAllTypes.OneofNestedMessageFieldNumber,
                 TestAllTypes.OneofStringFieldNumber,
                 TestAllTypes.OneofUint32FieldNumber }
                 .Select(fieldNumber => TestAllTypes.Descriptor.FindFieldByNumber(fieldNumber))
                 .ToList();
             foreach (var field in expectedFields)
             {
                 Assert.AreSame(descriptor, field.ContainingOneof);
             }

             CollectionAssert.AreEquivalent(expectedFields, descriptor.Fields);
             TestDescriptorToProto(descriptor.ToProto, descriptor.Proto);
         }

         [Test]
         public void MapEntryMessageDescriptor()
         {
             var descriptor = MapWellKnownTypes.Descriptor.NestedTypes[0];
             Assert.IsNull(descriptor.Parser);
             Assert.IsNull(descriptor.ClrType);
             Assert.IsNull(descriptor.Fields[1].Accessor);
             TestDescriptorToProto(descriptor.ToProto, descriptor.Proto);
         }

         // From TestFieldOrdering:
         // string my_string = 11;
         // int64 my_int = 1;
         // float my_float = 101;
         // NestedMessage single_nested_message = 200;
         [Test]
         public void FieldListOrderings()
         {
             var fields = TestFieldOrderings.Descriptor.Fields;
             Assert.AreEqual(new[] { 11, 1, 101, 200 }, fields.InDeclarationOrder().Select(x => x.FieldNumber));
             Assert.AreEqual(new[] { 1, 11, 101, 200 }, fields.InFieldNumberOrder().Select(x => x.FieldNumber));
         }


         [Test]
         public void DescriptorProtoFileDescriptor()
         {
             var descriptor = Google.Protobuf.Reflection.FileDescriptor.DescriptorProtoFileDescriptor;
             Assert.AreEqual("google/protobuf/descriptor.proto", descriptor.Name);
             TestDescriptorToProto(descriptor.ToProto, descriptor.Proto);
         }

         [Test]
         public void DescriptorImportingExtensionsFromOldCodeGen()
         {
             if (MethodOptions.Descriptor.FullName != "google.protobuf.MethodOptions")
             {
                 Assert.Ignore("Embedded descriptor for OldExtensions expects google.protobuf reflection package.");
             }

             // The extension collection includes a null extension. There's not a lot we can do about that
             // in itself, as the old generator didn't provide us the extension information.
             var extensions = TestProtos.OldGenerator.OldExtensions2Reflection.Descriptor.Extensions;
             Assert.AreEqual(1, extensions.UnorderedExtensions.Count);
             // Note: this assertion is present so that it will fail if OldExtensions2 is regenerated
             // with a new generator.
             Assert.Null(extensions.UnorderedExtensions[0].Extension);

             // ... but we can make sure we at least don't cause a failure when retrieving descriptors.
             // In particular, old_extensions1.proto imports old_extensions2.proto, and this used to cause
             // an execution-time failure.
             var importingDescriptor = TestProtos.OldGenerator.OldExtensions1Reflection.Descriptor;
             Assert.NotNull(importingDescriptor);
         }

         [Test]
         public void Proto3OptionalDescriptors()
         {
             var descriptor = TestProto3Optional.Descriptor;
             var field = descriptor.Fields[TestProto3Optional.OptionalInt32FieldNumber];
             Assert.NotNull(field.ContainingOneof);
             Assert.IsTrue(field.ContainingOneof.IsSynthetic);
             Assert.Null(field.RealContainingOneof);
         }


         [Test]
         public void SyntheticOneofReflection()
         {
             // Expect every oneof in TestProto3Optional to be synthetic
             var proto3OptionalDescriptor = TestProto3Optional.Descriptor;
             Assert.AreEqual(0, proto3OptionalDescriptor.RealOneofCount);
             foreach (var oneof in proto3OptionalDescriptor.Oneofs)
             {
                 Assert.True(oneof.IsSynthetic);
             }

             // Expect no oneof in the original proto3 unit test file to be synthetic.
             // (This excludes oneofs with "lazy" in the name, due to internal differences.)
             foreach (var descriptor in ProtobufTestMessages.Proto3.TestMessagesProto3Reflection.Descriptor.MessageTypes)
             {
                 var nonLazyOneofs = descriptor.Oneofs.Where(d => !d.Name.Contains("lazy")).ToList();
                 Assert.AreEqual(nonLazyOneofs.Count, descriptor.RealOneofCount);
                 foreach (var oneof in nonLazyOneofs)
                 {
                     Assert.False(oneof.IsSynthetic);
                 }
             }

             // Expect no oneof in the original proto2 unit test file to be synthetic.
             foreach (var descriptor in ProtobufTestMessages.Proto2.TestMessagesProto2Reflection.Descriptor.MessageTypes)
             {
                 Assert.AreEqual(descriptor.Oneofs.Count, descriptor.RealOneofCount);
                 foreach (var oneof in descriptor.Oneofs)
                 {
                     Assert.False(oneof.IsSynthetic);
                 }
             }
         }

         [Test]
         public void OptionRetention()
         {
           var proto = UnittestRetentionReflection.Descriptor.Proto;
           Assert.AreEqual(1, proto.Options.GetExtension(
               UnittestRetentionExtensions.PlainOption));
           Assert.AreEqual(2, proto.Options.GetExtension(
               UnittestRetentionExtensions.RuntimeRetentionOption));
           // This option has a value of 3 in the .proto file, but we expect it
           // to be zeroed out in the generated descriptor since it has source
           // retention.
           Assert.AreEqual(0, proto.Options.GetExtension(
               UnittestRetentionExtensions.SourceRetentionOption));
         }

         [Test]
         public void GetOptionsStripsFeatures()
         {
             var messageDescriptor = TestEditionsMessage.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("required_field");
             // Note: ideally we'd test GetOptions() for other descriptor types as well, but that requires
             // non-fields with features applied.
             Assert.Null(fieldDescriptor.GetOptions().Features);
         }

         [Test]
         public void LegacyRequiredTransform()
         {
             var messageDescriptor = TestEditionsMessage.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("required_field");
             Assert.True(fieldDescriptor.IsRequired);
         }

         [Test]
         public void LegacyGroupTransform()
         {
             var messageDescriptor = TestEditionsMessage.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("delimited_field");
             Assert.AreEqual(FieldType.Group, fieldDescriptor.FieldType);
         }

         [Test]
         public void LegacyInferRequired()
         {
             var messageDescriptor = proto2::TestRequired.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("a");
             Assert.AreEqual(FieldPresence.LegacyRequired, fieldDescriptor.Features.FieldPresence);
         }

         [Test]
         public void LegacyInferGroup()
         {
             var messageDescriptor = proto2::TestAllTypes.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("optionalgroup");
             Assert.AreEqual(MessageEncoding.Delimited, fieldDescriptor.Features.MessageEncoding);
         }

         [Test]
         public void LegacyInferProto2Packed()
         {
             var messageDescriptor = proto2::TestPackedTypes.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("packed_int32");
             Assert.AreEqual(RepeatedFieldEncoding.Packed, fieldDescriptor.Features.RepeatedFieldEncoding);
         }

         [Test]
         public void LegacyInferProto3Expanded()
         {
             var messageDescriptor = TestUnpackedTypes.Descriptor;
             var fieldDescriptor = messageDescriptor.FindFieldByName("unpacked_int32");
             Assert.NotNull(fieldDescriptor);
             Assert.AreEqual(RepeatedFieldEncoding.Expanded, fieldDescriptor.Features.RepeatedFieldEncoding);
         }

         private static void TestDescriptorToProto(Func<IMessage> toProtoFunction, IMessage expectedProto)
         {
             var clone1 = toProtoFunction();
             var clone2 = toProtoFunction();
             Assert.AreNotSame(clone1, clone2);
             Assert.AreNotSame(clone1, expectedProto);
             Assert.AreNotSame(clone2, expectedProto);

             Assert.AreEqual(clone1, clone2);
             Assert.AreEqual(clone1, expectedProto);
         }
     }
 }
	#region Copyright notice and license
	// Protocol Buffers - Google's data interchange format
	// Copyright 2008 Google Inc. All rights reserved.
	//
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file or at
	// https://developers.google.com/open-source/licenses/bsd
	#endregion

	using Google.Protobuf.TestProtos;
	using LegacyFeaturesUnittest;
	using NUnit.Framework;
	using ProtobufUnittest;
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using UnitTest.Issues.TestProtos;
	using static Google.Protobuf.Reflection.FeatureSet.Types;
	using proto2 = Google.Protobuf.TestProtos.Proto2;

	namespace Google.Protobuf.Reflection
	{
	/// <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_GeneratedCode()
	{
	TestFileDescriptor(
	UnittestProto3Reflection.Descriptor,
	UnittestImportProto3Reflection.Descriptor,
	UnittestImportPublicProto3Reflection.Descriptor);
	}

	[Test]
	public void FileDescriptor_BuildFromByteStrings()
	{
	// The descriptors have to be supplied in an order such that all the
	// dependencies come before the descriptors depending on them.
	var descriptorData = new List<ByteString>
	{
	UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
	UnittestImportProto3Reflection.Descriptor.SerializedData,
	UnittestProto3Reflection.Descriptor.SerializedData
	};
	var converted = FileDescriptor.BuildFromByteStrings(descriptorData);
	Assert.AreEqual(3, converted.Count);
	TestFileDescriptor(converted[2], converted[1], converted[0]);
	}

	[Test]
	public void FileDescriptor_BuildFromByteStrings_WithExtensionRegistry()
	{
	var extension = UnittestCustomOptionsProto3Extensions.MessageOpt1;

	var byteStrings = new[]
	{
	DescriptorReflection.Descriptor.Proto.ToByteString(),
	UnittestCustomOptionsProto3Reflection.Descriptor.Proto.ToByteString()
	};
	var registry = new ExtensionRegistry { extension };

	var descriptor = FileDescriptor.BuildFromByteStrings(byteStrings, registry).Last();
	var message = descriptor.MessageTypes.Single(t => t.Name == nameof(TestMessageWithCustomOptions));
	var extensionValue = message.GetOptions().GetExtension(extension);
	Assert.AreEqual(-56, extensionValue);
	}

	private void TestFileDescriptor(FileDescriptor file, FileDescriptor importedFile, FileDescriptor importedPublicFile)
	{
	Assert.AreEqual("csharp/protos/unittest_proto3.proto", file.Name);
	Assert.AreEqual("protobuf_unittest3", file.Package);

	Assert.AreEqual("UnittestProto", file.Proto.Options.JavaOuterClassname);
	Assert.AreEqual("csharp/protos/unittest_proto3.proto", file.Proto.Name);

	// unittest_proto3.proto doesn't have any public imports, but unittest_import_proto3.proto does.
	Assert.AreEqual(0, file.PublicDependencies.Count);
	Assert.AreEqual(1, importedFile.PublicDependencies.Count);
	Assert.AreEqual(importedPublicFile, importedFile.PublicDependencies[0]);

	Assert.AreEqual(1, file.Dependencies.Count);
	Assert.AreEqual(importedFile, file.Dependencies[0]);

	Assert.Null(file.FindTypeByName<MessageDescriptor>("NoSuchType"));
	Assert.Null(file.FindTypeByName<MessageDescriptor>("protobuf_unittest3.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_unittest3.ForeignEnum"));
	Assert.AreEqual(1, importedFile.EnumTypes.Count);
	Assert.AreEqual("ImportEnum", importedFile.EnumTypes[0].Name);
	for (int i = 0; i < file.EnumTypes.Count; i++)
	{
	Assert.AreEqual(i, file.EnumTypes[i].Index);
	}

	Assert.AreEqual(10, file.SerializedData[0]);
	TestDescriptorToProto(file.ToProto, file.Proto);
	}

	[Test]
	public void FileDescriptor_BuildFromByteStrings_MissingDependency()
	{
	var descriptorData = new List<ByteString>
	{
	UnittestImportProto3Reflection.Descriptor.SerializedData,
	UnittestProto3Reflection.Descriptor.SerializedData,
	};
	// This will fail, because we're missing UnittestImportPublicProto3Reflection
	Assert.Throws<ArgumentException>(() => FileDescriptor.BuildFromByteStrings(descriptorData));
	}

	[Test]
	public void FileDescriptor_BuildFromByteStrings_DuplicateNames()
	{
	var descriptorData = new List<ByteString>
	{
	UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
	UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
	};
	// This will fail due to the same name being used twice
	Assert.Throws<ArgumentException>(() => FileDescriptor.BuildFromByteStrings(descriptorData));
	}

	[Test]
	public void FileDescriptor_BuildFromByteStrings_IncorrectOrder()
	{
	var descriptorData = new List<ByteString>
	{
	UnittestProto3Reflection.Descriptor.SerializedData,
	UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
	UnittestImportProto3Reflection.Descriptor.SerializedData
	};
	// This will fail, because the dependencies should come first
	Assert.Throws<ArgumentException>(() => FileDescriptor.BuildFromByteStrings(descriptorData));

	}

	[Test]
	public void MessageDescriptorFromGeneratedCodeFileDescriptor()
	{
	var file = UnittestProto3Reflection.Descriptor;

	MessageDescriptor messageType = TestAllTypes.Descriptor;
	Assert.AreSame(typeof(TestAllTypes), messageType.ClrType);
	Assert.AreSame(TestAllTypes.Parser, messageType.Parser);
	Assert.AreEqual(messageType, file.MessageTypes[0]);
	Assert.AreEqual(messageType, file.FindTypeByName<MessageDescriptor>("TestAllTypes"));
	}

	[Test]
	public void MessageDescriptor()
	{
	MessageDescriptor messageType = TestAllTypes.Descriptor;
	MessageDescriptor nestedType = TestAllTypes.Types.NestedMessage.Descriptor;

	Assert.AreEqual("TestAllTypes", messageType.Name);
	Assert.AreEqual("protobuf_unittest3.TestAllTypes", messageType.FullName);
	Assert.AreEqual(UnittestProto3Reflection.Descriptor, messageType.File);
	Assert.IsNull(messageType.ContainingType);
	Assert.IsNull(messageType.Proto.Options);

	Assert.AreEqual("TestAllTypes", messageType.Name);

	Assert.AreEqual("NestedMessage", nestedType.Name);
	Assert.AreEqual("protobuf_unittest3.TestAllTypes.NestedMessage", nestedType.FullName);
	Assert.AreEqual(UnittestProto3Reflection.Descriptor, nestedType.File);
	Assert.AreEqual(messageType, nestedType.ContainingType);

	FieldDescriptor field = messageType.Fields.InDeclarationOrder()[0];
	Assert.AreEqual("single_int32", field.Name);
	Assert.AreEqual(field, messageType.FindDescriptor<FieldDescriptor>("single_int32"));
	Assert.Null(messageType.FindDescriptor<FieldDescriptor>("no_such_field"));
	Assert.AreEqual(field, messageType.FindFieldByNumber(1));
	Assert.Null(messageType.FindFieldByNumber(571283));
	var fieldsInDeclarationOrder = messageType.Fields.InDeclarationOrder();
	for (int i = 0; i < fieldsInDeclarationOrder.Count; i++)
	{
	Assert.AreEqual(i, fieldsInDeclarationOrder[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);
	}
	TestDescriptorToProto(messageType.ToProto, messageType.Proto);
	}

	[Test]
	public void MessageDescriptor_IsMapEntry()
	{
	var testMapMessage = TestMap.Descriptor;
	Assert.False(testMapMessage.IsMapEntry);
	Assert.True(testMapMessage.Fields[1].MessageType.IsMapEntry);
	}

	[Test]
	public void FieldDescriptor_GeneratedCode()
	{
	TestFieldDescriptor(UnittestProto3Reflection.Descriptor, TestAllTypes.Descriptor, ForeignMessage.Descriptor, ImportMessage.Descriptor);
	}

	[Test]
	public void FieldDescriptor_BuildFromByteStrings()
	{
	// The descriptors have to be supplied in an order such that all the
	// dependencies come before the descriptors depending on them.
	var descriptorData = new List<ByteString>
	{
	UnittestImportPublicProto3Reflection.Descriptor.SerializedData,
	UnittestImportProto3Reflection.Descriptor.SerializedData,
	UnittestProto3Reflection.Descriptor.SerializedData
	};
	var converted = FileDescriptor.BuildFromByteStrings(descriptorData);
	TestFieldDescriptor(
	converted[2],
	converted[2].FindTypeByName<MessageDescriptor>("TestAllTypes"),
	converted[2].FindTypeByName<MessageDescriptor>("ForeignMessage"),
	converted[1].FindTypeByName<MessageDescriptor>("ImportMessage"));
	}

	public void TestFieldDescriptor(
	FileDescriptor unitTestProto3Descriptor,
	MessageDescriptor testAllTypesDescriptor,
	MessageDescriptor foreignMessageDescriptor,
	MessageDescriptor importMessageDescriptor)
	{
	FieldDescriptor primitiveField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_int32");
	FieldDescriptor enumField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_nested_enum");
	FieldDescriptor foreignMessageField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_foreign_message");
	FieldDescriptor importMessageField = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("single_import_message");
	FieldDescriptor fieldInOneof = testAllTypesDescriptor.FindDescriptor<FieldDescriptor>("oneof_string");

	Assert.AreEqual("single_int32", primitiveField.Name);
	Assert.AreEqual("protobuf_unittest3.TestAllTypes.single_int32",
	primitiveField.FullName);
	Assert.AreEqual(1, primitiveField.FieldNumber);
	Assert.AreEqual(testAllTypesDescriptor, primitiveField.ContainingType);
	Assert.AreEqual(unitTestProto3Descriptor, primitiveField.File);
	Assert.AreEqual(FieldType.Int32, primitiveField.FieldType);
	Assert.IsNull(primitiveField.Proto.Options);

	Assert.AreEqual("single_nested_enum", enumField.Name);
	Assert.AreEqual(FieldType.Enum, enumField.FieldType);
	Assert.AreEqual(testAllTypesDescriptor.EnumTypes[0], enumField.EnumType);

	Assert.AreEqual("single_foreign_message", foreignMessageField.Name);
	Assert.AreEqual(FieldType.Message, foreignMessageField.FieldType);
	Assert.AreEqual(foreignMessageDescriptor, foreignMessageField.MessageType);

	Assert.AreEqual("single_import_message", importMessageField.Name);
	Assert.AreEqual(FieldType.Message, importMessageField.FieldType);
	Assert.AreEqual(importMessageDescriptor, importMessageField.MessageType);

	// For a field in a regular onoef, ContainingOneof and RealContainingOneof should be the same.
	Assert.AreEqual("oneof_field", fieldInOneof.ContainingOneof.Name);
	Assert.AreSame(fieldInOneof.ContainingOneof, fieldInOneof.RealContainingOneof);

	TestDescriptorToProto(primitiveField.ToProto, primitiveField.Proto);
	TestDescriptorToProto(enumField.ToProto, enumField.Proto);
	TestDescriptorToProto(foreignMessageField.ToProto, foreignMessageField.Proto);
	TestDescriptorToProto(fieldInOneof.ToProto, fieldInOneof.Proto);
	}

	[Test]
	public void FieldDescriptorLabel()
	{
	FieldDescriptor singleField =
	TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("single_int32");
	FieldDescriptor repeatedField =
	TestAllTypes.Descriptor.FindDescriptor<FieldDescriptor>("repeated_int32");

	Assert.IsFalse(singleField.IsRepeated);
	Assert.IsTrue(repeatedField.IsRepeated);
	}

	[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 = UnittestProto3Reflection.Descriptor.FindTypeByName<EnumDescriptor>("ForeignEnum");
	EnumDescriptor nestedType = TestAllTypes.Descriptor.FindDescriptor<EnumDescriptor>("NestedEnum");

	Assert.AreEqual("ForeignEnum", enumType.Name);
	Assert.AreEqual("protobuf_unittest3.ForeignEnum", enumType.FullName);
	Assert.AreEqual(UnittestProto3Reflection.Descriptor, enumType.File);
	Assert.Null(enumType.ContainingType);
	Assert.Null(enumType.Proto.Options);

	Assert.AreEqual("NestedEnum", nestedType.Name);
	Assert.AreEqual("protobuf_unittest3.TestAllTypes.NestedEnum",
	nestedType.FullName);
	Assert.AreEqual(UnittestProto3Reflection.Descriptor, nestedType.File);
	Assert.AreEqual(TestAllTypes.Descriptor, nestedType.ContainingType);

	EnumValueDescriptor value = enumType.FindValueByName("FOREIGN_FOO");
	Assert.AreEqual(value, enumType.Values[1]);
	Assert.AreEqual("FOREIGN_FOO", value.Name);
	Assert.AreEqual(4, value.Number);
	Assert.AreEqual((int) ForeignEnum.ForeignFoo, 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);
	}
	TestDescriptorToProto(enumType.ToProto, enumType.Proto);
	TestDescriptorToProto(nestedType.ToProto, nestedType.Proto);
	}

	[Test]
	public void OneofDescriptor()
	{
	OneofDescriptor descriptor = TestAllTypes.Descriptor.FindDescriptor<OneofDescriptor>("oneof_field");
	Assert.IsFalse(descriptor.IsSynthetic);
	Assert.AreEqual("oneof_field", descriptor.Name);
	Assert.AreEqual("protobuf_unittest3.TestAllTypes.oneof_field", descriptor.FullName);

	var expectedFields = new[] {
	TestAllTypes.OneofBytesFieldNumber,
	TestAllTypes.OneofNestedMessageFieldNumber,
	TestAllTypes.OneofStringFieldNumber,
	TestAllTypes.OneofUint32FieldNumber }
	.Select(fieldNumber => TestAllTypes.Descriptor.FindFieldByNumber(fieldNumber))
	.ToList();
	foreach (var field in expectedFields)
	{
	Assert.AreSame(descriptor, field.ContainingOneof);
	}

	CollectionAssert.AreEquivalent(expectedFields, descriptor.Fields);
	TestDescriptorToProto(descriptor.ToProto, descriptor.Proto);
	}

	[Test]
	public void MapEntryMessageDescriptor()
	{
	var descriptor = MapWellKnownTypes.Descriptor.NestedTypes[0];
	Assert.IsNull(descriptor.Parser);
	Assert.IsNull(descriptor.ClrType);
	Assert.IsNull(descriptor.Fields[1].Accessor);
	TestDescriptorToProto(descriptor.ToProto, descriptor.Proto);
	}

	// From TestFieldOrdering:
	// string my_string = 11;
	// int64 my_int = 1;
	// float my_float = 101;
	// NestedMessage single_nested_message = 200;
	[Test]
	public void FieldListOrderings()
	{
	var fields = TestFieldOrderings.Descriptor.Fields;
	Assert.AreEqual(new[] { 11, 1, 101, 200 }, fields.InDeclarationOrder().Select(x => x.FieldNumber));
	Assert.AreEqual(new[] { 1, 11, 101, 200 }, fields.InFieldNumberOrder().Select(x => x.FieldNumber));
	}


	[Test]
	public void DescriptorProtoFileDescriptor()
	{
	var descriptor = Google.Protobuf.Reflection.FileDescriptor.DescriptorProtoFileDescriptor;
	Assert.AreEqual("google/protobuf/descriptor.proto", descriptor.Name);
	TestDescriptorToProto(descriptor.ToProto, descriptor.Proto);
	}

	[Test]
	public void DescriptorImportingExtensionsFromOldCodeGen()
	{
	if (MethodOptions.Descriptor.FullName != "google.protobuf.MethodOptions")
	{
	Assert.Ignore("Embedded descriptor for OldExtensions expects google.protobuf reflection package.");
	}

	// The extension collection includes a null extension. There's not a lot we can do about that
	// in itself, as the old generator didn't provide us the extension information.
	var extensions = TestProtos.OldGenerator.OldExtensions2Reflection.Descriptor.Extensions;
	Assert.AreEqual(1, extensions.UnorderedExtensions.Count);
	// Note: this assertion is present so that it will fail if OldExtensions2 is regenerated
	// with a new generator.
	Assert.Null(extensions.UnorderedExtensions[0].Extension);

	// ... but we can make sure we at least don't cause a failure when retrieving descriptors.
	// In particular, old_extensions1.proto imports old_extensions2.proto, and this used to cause
	// an execution-time failure.
	var importingDescriptor = TestProtos.OldGenerator.OldExtensions1Reflection.Descriptor;
	Assert.NotNull(importingDescriptor);
	}

	[Test]
	public void Proto3OptionalDescriptors()
	{
	var descriptor = TestProto3Optional.Descriptor;
	var field = descriptor.Fields[TestProto3Optional.OptionalInt32FieldNumber];
	Assert.NotNull(field.ContainingOneof);
	Assert.IsTrue(field.ContainingOneof.IsSynthetic);
	Assert.Null(field.RealContainingOneof);
	}


	[Test]
	public void SyntheticOneofReflection()
	{
	// Expect every oneof in TestProto3Optional to be synthetic
	var proto3OptionalDescriptor = TestProto3Optional.Descriptor;
	Assert.AreEqual(0, proto3OptionalDescriptor.RealOneofCount);
	foreach (var oneof in proto3OptionalDescriptor.Oneofs)
	{
	Assert.True(oneof.IsSynthetic);
	}

	// Expect no oneof in the original proto3 unit test file to be synthetic.
	// (This excludes oneofs with "lazy" in the name, due to internal differences.)
	foreach (var descriptor in ProtobufTestMessages.Proto3.TestMessagesProto3Reflection.Descriptor.MessageTypes)
	{
	var nonLazyOneofs = descriptor.Oneofs.Where(d => !d.Name.Contains("lazy")).ToList();
	Assert.AreEqual(nonLazyOneofs.Count, descriptor.RealOneofCount);
	foreach (var oneof in nonLazyOneofs)
	{
	Assert.False(oneof.IsSynthetic);
	}
	}

	// Expect no oneof in the original proto2 unit test file to be synthetic.
	foreach (var descriptor in ProtobufTestMessages.Proto2.TestMessagesProto2Reflection.Descriptor.MessageTypes)
	{
	Assert.AreEqual(descriptor.Oneofs.Count, descriptor.RealOneofCount);
	foreach (var oneof in descriptor.Oneofs)
	{
	Assert.False(oneof.IsSynthetic);
	}
	}
	}

	[Test]
	public void OptionRetention()
	{
	var proto = UnittestRetentionReflection.Descriptor.Proto;
	Assert.AreEqual(1, proto.Options.GetExtension(
	UnittestRetentionExtensions.PlainOption));
	Assert.AreEqual(2, proto.Options.GetExtension(
	UnittestRetentionExtensions.RuntimeRetentionOption));
	// This option has a value of 3 in the .proto file, but we expect it
	// to be zeroed out in the generated descriptor since it has source
	// retention.
	Assert.AreEqual(0, proto.Options.GetExtension(
	UnittestRetentionExtensions.SourceRetentionOption));
	}

	[Test]
	public void GetOptionsStripsFeatures()
	{
	var messageDescriptor = TestEditionsMessage.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("required_field");
	// Note: ideally we'd test GetOptions() for other descriptor types as well, but that requires
	// non-fields with features applied.
	Assert.Null(fieldDescriptor.GetOptions().Features);
	}

	[Test]
	public void LegacyRequiredTransform()
	{
	var messageDescriptor = TestEditionsMessage.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("required_field");
	Assert.True(fieldDescriptor.IsRequired);
	}

	[Test]
	public void LegacyGroupTransform()
	{
	var messageDescriptor = TestEditionsMessage.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("delimited_field");
	Assert.AreEqual(FieldType.Group, fieldDescriptor.FieldType);
	}

	[Test]
	public void LegacyInferRequired()
	{
	var messageDescriptor = proto2::TestRequired.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("a");
	Assert.AreEqual(FieldPresence.LegacyRequired, fieldDescriptor.Features.FieldPresence);
	}

	[Test]
	public void LegacyInferGroup()
	{
	var messageDescriptor = proto2::TestAllTypes.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("optionalgroup");
	Assert.AreEqual(MessageEncoding.Delimited, fieldDescriptor.Features.MessageEncoding);
	}

	[Test]
	public void LegacyInferProto2Packed()
	{
	var messageDescriptor = proto2::TestPackedTypes.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("packed_int32");
	Assert.AreEqual(RepeatedFieldEncoding.Packed, fieldDescriptor.Features.RepeatedFieldEncoding);
	}

	[Test]
	public void LegacyInferProto3Expanded()
	{
	var messageDescriptor = TestUnpackedTypes.Descriptor;
	var fieldDescriptor = messageDescriptor.FindFieldByName("unpacked_int32");
	Assert.NotNull(fieldDescriptor);
	Assert.AreEqual(RepeatedFieldEncoding.Expanded, fieldDescriptor.Features.RepeatedFieldEncoding);
	}

	private static void TestDescriptorToProto(Func<IMessage> toProtoFunction, IMessage expectedProto)
	{
	var clone1 = toProtoFunction();
	var clone2 = toProtoFunction();
	Assert.AreNotSame(clone1, clone2);
	Assert.AreNotSame(clone1, expectedProto);
	Assert.AreNotSame(clone2, expectedProto);

	Assert.AreEqual(clone1, clone2);
	Assert.AreEqual(clone1, expectedProto);
	}
	}
	}