Joseph Doherty
83 lines
3.3 KiB
C#
83 lines
3.3 KiB
C#
using System.Text.Json;
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using ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;
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namespace ZB.MOM.WW.ScadaBridge.Commons.Tests.Messages;
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/// <summary>
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/// Regression tests for Commons-008 — <see cref="SetConnectionBindingsCommand"/>
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/// previously declared its bindings as <c>IReadOnlyList<(string, int)></c>.
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/// A <c>ValueTuple</c> serializes as <c>Item1</c>/<c>Item2</c> and cannot evolve
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/// additively (REQ-COM-5a). It is now a named <see cref="ConnectionBinding"/> record.
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/// </summary>
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public class ConnectionBindingSerializationTests
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{
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[Fact]
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public void ConnectionBinding_SerializesWithNamedProperties()
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{
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var json = JsonSerializer.Serialize(new ConnectionBinding("Temperature", 42));
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using var doc = JsonDocument.Parse(json);
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Assert.Equal(JsonValueKind.String, doc.RootElement.GetProperty("AttributeName").ValueKind);
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Assert.Equal("Temperature", doc.RootElement.GetProperty("AttributeName").GetString());
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Assert.Equal(42, doc.RootElement.GetProperty("DataConnectionId").GetInt32());
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// The ValueTuple failure mode: Item1/Item2 must NOT appear.
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Assert.False(doc.RootElement.TryGetProperty("Item1", out _));
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Assert.False(doc.RootElement.TryGetProperty("Item2", out _));
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}
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[Fact]
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public void SetConnectionBindingsCommand_RoundTripsThroughJson()
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{
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var original = new SetConnectionBindingsCommand(
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7,
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new List<ConnectionBinding>
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{
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new("Speed", 5),
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new("Mode", 11),
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});
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var json = JsonSerializer.Serialize(original);
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var deserialized = JsonSerializer.Deserialize<SetConnectionBindingsCommand>(json);
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Assert.NotNull(deserialized);
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Assert.Equal(7, deserialized!.InstanceId);
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Assert.Equal(2, deserialized.Bindings.Count);
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Assert.Equal("Speed", deserialized.Bindings[0].AttributeName);
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Assert.Equal(5, deserialized.Bindings[0].DataConnectionId);
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Assert.Equal("Mode", deserialized.Bindings[1].AttributeName);
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Assert.Equal(11, deserialized.Bindings[1].DataConnectionId);
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// ConnectionBinding is a record: each element compares by value.
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Assert.Equal(original.Bindings, deserialized.Bindings);
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}
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[Fact]
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public void Roundtrip_preserves_override_when_set()
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{
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var original = new ConnectionBinding("Speed", 7, "ns=2;s=Pump1.Speed");
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var json = JsonSerializer.Serialize(original);
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var roundtripped = JsonSerializer.Deserialize<ConnectionBinding>(json);
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Assert.NotNull(roundtripped);
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Assert.Equal(original, roundtripped);
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Assert.Equal("ns=2;s=Pump1.Speed", roundtripped!.DataSourceReferenceOverride);
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}
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[Fact]
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public void Roundtrip_defaults_override_to_null_when_absent()
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{
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// Older site builds will not emit the new field — deserialization
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// must produce a null override and equal an explicit-null instance.
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const string legacyJson = """{"AttributeName":"Speed","DataConnectionId":7}""";
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var deserialized = JsonSerializer.Deserialize<ConnectionBinding>(legacyJson);
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Assert.NotNull(deserialized);
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Assert.Equal("Speed", deserialized!.AttributeName);
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Assert.Equal(7, deserialized.DataConnectionId);
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Assert.Null(deserialized.DataSourceReferenceOverride);
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}
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}
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