junction/tests/Junction.Tests/Unit/DataItemTests.cs

using System;
using Junction.Domain.Models;
using Xunit;

namespace Junction.Tests.Unit
{
    public class DataItemTests
    {
        [Fact]
        public void Ctor_HoldsAllValues()
        {
            var ts = DateTimeOffset.UtcNow;
            var item = new DataItem("id1", "Temperature", "42.5", "Sample", ts);

            Assert.Equal("id1", item.Id);
            Assert.Equal("Temperature", item.Name);
            Assert.Equal("42.5", item.Value);
            Assert.Equal("Sample", item.Category);
            Assert.Equal(ts, item.Timestamp);
        }

        [Fact]
        public void Ctor_NullStrings_DefaultToEmpty()
        {
            var item = new DataItem(null!, null!, null!, null!, DateTimeOffset.UtcNow);

            Assert.Equal("", item.Id);
            Assert.Equal("", item.Name);
            Assert.Equal("", item.Value);
            Assert.Equal("", item.Category);
        }

        [Fact]
        public void Properties_AreGetOnly()
        {
            var props = typeof(DataItem).GetProperties();
            Assert.All(props, p => Assert.Null(p.SetMethod));
        }
    }
}