UA-.NETStandard/tests/Opc.Ua.Aot.Tests/EncodingAotTests.cs

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namespace Opc.Ua.Aot.Tests
{
    /// <summary>
    /// AOT integration tests for binary and JSON encoding round-trips.
    /// </summary>
    [ClassDataSource<AotTestFixture>(Shared = SharedType.PerTestSession)]
    public class EncodingAotTests(AotTestFixture fixture)
    {
        [Test]
        public async Task BinaryEncodeDecodeDataValueAsync()
        {
            var original = new DataValue(Variant.From(42), StatusCodes.Good);

            using var stream = new MemoryStream();
            using (var encoder = new BinaryEncoder(
                stream, fixture.Session.MessageContext, true))
            {
                encoder.WriteDataValue("Value", original);
            }

            stream.Position = 0;
            using var decoder = new BinaryDecoder(
                stream, fixture.Session.MessageContext, true);
            DataValue decoded = decoder.ReadDataValue("Value");

            await Assert.That(decoded.IsNull).IsFalse();
            await Assert.That(StatusCode.IsGood(decoded.StatusCode)).IsTrue();
        }

        [Test]
        public async Task BinaryEncodeDecodeNodeIdAsync()
        {
            NodeId[] nodeIds =
            [
                new NodeId(12345),
                new NodeId("TestString", 2),
                new NodeId(Guid.NewGuid(), 0),
                NodeId.Parse("ns=0;b=AQIDBA==")
            ];

            using var stream = new MemoryStream();
            using (var encoder = new BinaryEncoder(
                stream, fixture.Session.MessageContext, true))
            {
                foreach (NodeId nodeId in nodeIds)
                {
                    encoder.WriteNodeId("NodeId", nodeId);
                }
            }

            stream.Position = 0;
            using var decoder = new BinaryDecoder(
                stream, fixture.Session.MessageContext, true);

            for (int i = 0; i < nodeIds.Length; i++)
            {
                NodeId decoded = decoder.ReadNodeId("NodeId");
                await Assert.That(decoded).IsEqualTo(nodeIds[i]);
            }
        }

        [Test]
        public async Task BinaryEncodeDecodeExtensionObjectAsync()
        {
            var readValueId = new ReadValueId
            {
                NodeId = VariableIds.Server_ServerStatus,
                AttributeId = Attributes.Value
            };
            var original = new ExtensionObject(readValueId);

            using var stream = new MemoryStream();
            using (var encoder = new BinaryEncoder(
                stream, fixture.Session.MessageContext, true))
            {
                encoder.WriteExtensionObject("ExtObj", original);
            }

            stream.Position = 0;
            using var decoder = new BinaryDecoder(
                stream, fixture.Session.MessageContext, true);
            ExtensionObject decoded = decoder.ReadExtensionObject("ExtObj");

            await Assert.That(decoded.TypeId.IsNull).IsFalse();
        }

        [Test]
        public async Task JsonEncodeDecodeDataValueAsync()
        {
            var original = new DataValue(Variant.From(42), StatusCodes.Good);

            string json;
            using (var encoder = new JsonEncoder(
                fixture.Session.MessageContext))
            {
                encoder.WriteDataValue("Value", original);
                json = encoder.CloseAndReturnText();
            }

            await Assert.That(json).IsNotNull();
            await Assert.That(json).Contains("42");

            using var decoder = new JsonDecoder(
                json, fixture.Session.MessageContext);
            DataValue decoded = decoder.ReadDataValue("Value");

            await Assert.That(decoded.IsNull).IsFalse();
            await Assert.That(StatusCode.IsGood(decoded.StatusCode)).IsTrue();
        }

        [Test]
        public async Task BinaryEncodeDecodeVariantAsync()
        {
            Variant[] variants =
            [
                Variant.From(123),
                Variant.From("Hello AOT"),
                Variant.From([1, 2, 3]),
                Variant.From(DateTimeUtc.Now)
            ];

            using var stream = new MemoryStream();
            using (var encoder = new BinaryEncoder(
                stream, fixture.Session.MessageContext, true))
            {
                for (int i = 0; i < variants.Length; i++)
                {
                    encoder.WriteVariant("Variant", variants[i]);
                }
            }

            stream.Position = 0;
            using var decoder = new BinaryDecoder(
                stream, fixture.Session.MessageContext, true);

            for (int i = 0; i < variants.Length; i++)
            {
                Variant decoded = decoder.ReadVariant("Variant");
                await Assert.That(decoded.AsBoxedObject()).IsNotNull();
            }
        }
    }
}