Add initial Activity / Metric support (#183)

tests/ModelContextProtocol.Tests/Protocol/RequestIdTests.cs

@@ -0,0 +1,38 @@
+using ModelContextProtocol.Protocol.Messages;
+using System.Text.Json;
+
+namespace ModelContextProtocol.Tests.Protocol;
+
+public class RequestIdTests
+{
+    [Fact]
+    public void StringCtor_Roundtrips()
+    {
+        RequestId id = new("test-id");
+        Assert.Equal("test-id", id.ToString());
+        Assert.Equal("\"test-id\"", JsonSerializer.Serialize(id));
+        Assert.Same("test-id", id.Id);
+
+        Assert.True(id.Equals(new("test-id")));
+        Assert.False(id.Equals(new("tEst-id")));
+        Assert.Equal("test-id".GetHashCode(), id.GetHashCode());
+
+        Assert.Equal(id, JsonSerializer.Deserialize<RequestId>(JsonSerializer.Serialize(id)));
+    }
+
+    [Fact]
+    public void Int64Ctor_Roundtrips()
+    {
+        RequestId id = new(42);
+        Assert.Equal("42", id.ToString());
+        Assert.Equal("42", JsonSerializer.Serialize(id));
+        Assert.Equal(42, Assert.IsType<long>(id.Id));
+
+        Assert.True(id.Equals(new(42)));
+        Assert.False(id.Equals(new(43)));
+        Assert.False(id.Equals(new("42")));
+        Assert.Equal(42L.GetHashCode(), id.GetHashCode());
+
+        Assert.Equal(id, JsonSerializer.Deserialize<RequestId>(JsonSerializer.Serialize(id)));
+    }
+}