Sharp7Reactive/Sharp7.Rx.Tests/S7ValueConverterTests/ConverterTestBase.cs

using System.Reflection;
using Sharp7.Rx.Interfaces;

namespace Sharp7.Rx.Tests.S7ValueConverterTests;

internal abstract class ConverterTestBase
{
    protected static readonly IS7VariableNameParser Parser = new S7VariableNameParser();

    public static MethodInfo CreateReadMethod(ConverterTestCase tc)
    {
        var convertMi = typeof(S7ValueConverter).GetMethod(nameof(S7ValueConverter.ReadFromBuffer));
        var convert = convertMi!.MakeGenericMethod(tc.Value.GetType());
        return convert;
    }

    public static MethodInfo CreateWriteMethod(ConverterTestCase tc)
    {
        var writeMi = typeof(ConverterTestBase).GetMethod(nameof(WriteToBuffer));
        var write = writeMi!.MakeGenericMethod(tc.Value.GetType());
        return write;
    }

    public static IEnumerable<ConverterTestCase> GetValidTestCases()
    {
        yield return new ConverterTestCase(true, "DB99.bit5.4", [0x10]);
        yield return new ConverterTestCase(false, "DB99.bit5.4", [0x00]);

        yield return new ConverterTestCase((byte) 18, "DB99.Byte5", [0x12]);
        yield return new ConverterTestCase((short) 4660, "DB99.Int5", [0x12, 0x34]);
        yield return new ConverterTestCase((short) -3532, "DB99.Int5", [0xF2, 0x34]);
        yield return new ConverterTestCase((ushort) 4660, "DB99.UInt5", [0x12, 0x34]);
        yield return new ConverterTestCase((ushort) 3532, "DB99.UInt5", [0xF2, 0x34]);
        yield return new ConverterTestCase(305419879, "DB99.DInt5", [0x12, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(-231451033, "DB99.DInt5", [0xF2, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(305419879u, "DB99.UDInt5", [0x12, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(231451033u, "DB99.UDInt5", [0xF2, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(1311768394163015151L, "DB99.LInt5", [0x12, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(-994074615050678801L, "DB99.LInt5", [0xF2, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(1311768394163015151uL, "DB99.ULInt5", [0x12, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(17452669458658872815uL, "DB99.ULInt5", [0xF2, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(0.25f, "DB99.Real5", [0x3E, 0x80, 0x00, 0x00]);
        yield return new ConverterTestCase(0.25, "DB99.LReal5", [0x3E, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);

        yield return new ConverterTestCase(new byte[] {0x12, 0x34, 0x56, 0x67}, "DB99.Byte5.4", [0x12, 0x34, 0x56, 0x67]);

        yield return new ConverterTestCase("ABCD", "DB99.String10.4", [0x04, 0x04, 0x41, 0x42, 0x43, 0x44]);
        yield return new ConverterTestCase("ABCD", "DB99.String10.6", [0x06, 0x04, 0x41, 0x42, 0x43, 0x44, 0x00, 0x00]);
        yield return new ConverterTestCase("ABCD", "DB99.WString10.4", [0x00, 0x04, 0x00, 0x04, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44]);
        yield return new ConverterTestCase("ABCD", "DB99.WString10.6", [0x00, 0x06, 0x00, 0x04, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44, 0x00, 0x00, 0x00, 0x00]);
        yield return new ConverterTestCase("ABCD", "DB99.Byte5.4", [0x41, 0x42, 0x43, 0x44]);

        yield return new ConverterTestCase(true, "DB99.DBx0.0", [0x01]);
        yield return new ConverterTestCase(false, "DB99.DBx0.0", [0x00]);
        yield return new ConverterTestCase(true, "DB99.DBx0.4", [0x10]);
        yield return new ConverterTestCase(false, "DB99.DBx0.4", [0]);
        yield return new ConverterTestCase((byte) 18, "DB99.DBB0", [0x12]);
        yield return new ConverterTestCase((short) 4660, "DB99.INT0", [0x12, 0x34]);
        yield return new ConverterTestCase((short) -3532, "DB99.INT0", [0xF2, 0x34]);
        yield return new ConverterTestCase(-3532, "DB99.INT0", [0xF2, 0x34]);
        yield return new ConverterTestCase(305419879, "DB99.DINT0", [0x12, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(-231451033, "DB99.DINT0", [0xF2, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(1311768394163015151L, "DB99.dul0", [0x12, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(-994074615050678801L, "DB99.dul0", [0xF2, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(1311768394163015151uL, "DB99.dul0", [0x12, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(17452669458658872815uL, "DB99.dul0", [0xF2, 0x34, 0x56, 0x67, 0x89, 0xAB, 0xCD, 0xEF]);
        yield return new ConverterTestCase(new byte[] {0x12, 0x34, 0x56, 0x67}, "DB99.DBB0.4", [0x12, 0x34, 0x56, 0x67]);
        yield return new ConverterTestCase(0.25f, "DB99.D0", [0x3E, 0x80, 0x00, 0x00]);
    }

    /// <summary>
    ///     This helper method exists, since I could not manage to invoke a generic method
    ///     accepring a Span&lt;T&gt; as parameter.
    /// </summary>
    public static void WriteToBuffer<TValue>(byte[] buffer, TValue value, S7VariableAddress address)
    {
        S7ValueConverter.WriteToBuffer(buffer, value, address);
    }

    public record ConverterTestCase(object Value, string Address, byte[] Data)
    {
        public S7VariableAddress VariableAddress => Parser.Parse(Address);

        public override string ToString() => $"{Address} {Value} ({Value.GetType().Name})";
    }
}