Adopted further C# 14 and .NET 10 features (#1158)

app/Tests/Provider/ModelIdOrderTests.cs

@@ -0,0 +1,25 @@
+using AIStudio.Provider;
+
+namespace AIStudio.Tests.Provider;
+
+/// <summary>
+/// Checks the order in which the dialogs for providers list the models, newest first.
+/// </summary>
+/// <remarks>
+/// Compared digit by digit, "gpt-4.9" would come before "gpt-4.10" and "o3" before "o10", so an older
+/// model would be on top of the list.
+/// </remarks>
+[TestFixture]
+public sealed class ModelIdOrderTests
+{
+    [TestCase(new[] { "gpt-4.9", "gpt-4.10", "gpt-4.1" }, new[] { "gpt-4.10", "gpt-4.9", "gpt-4.1" }, TestName = "Version numbers after a dot")]
+    [TestCase(new[] { "o3", "o10", "o1" }, new[] { "o10", "o3", "o1" }, TestName = "Numbers after a letter")]
+    [TestCase(new[] { "llama3.1:8b", "llama3.1:70b" }, new[] { "llama3.1:70b", "llama3.1:8b" }, TestName = "Sizes of a model")]
+    [TestCase(new[] { "mistral-large-2407", "mistral-large-2411", "mistral-large-latest" }, new[] { "mistral-large-latest", "mistral-large-2411", "mistral-large-2407" }, TestName = "Dates of a model")]
+    public void TheNewestModelsComeFirst(string[] modelIds, string[] expectedOrder)
+    {
+        var ordered = modelIds.OrderByDescending(id => id, Model.ID_ORDER);
+
+        Assert.That(ordered, Is.EqualTo(expectedOrder));
+    }
+}