Added the Model Comparison assistant for blind comparisons of two models (#1009)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/Tests/Provider/ProviderIdentityTests.cs

@@ -0,0 +1,38 @@
+using AIStudio.Provider;
+
+namespace AIStudio.Tests.Provider;
+
+/// <summary>
+/// Checks how messages to the user name a provider which hides which provider it is, see IProvider.HidesIdentity.
+/// </summary>
+[TestFixture]
+public sealed class ProviderIdentityTests
+{
+    private static readonly Model MODEL = new("gpt-test", null);
+
+    [Test]
+    public void AProviderNamesItselfByDefault()
+    {
+        var provider = new NoProvider { InstanceName = "My provider" };
+
+        using (Assert.EnterMultipleScope())
+        {
+            Assert.That(provider.NameForUser, Is.EqualTo("My provider"));
+            Assert.That(provider.TypeForUser, Is.EqualTo(nameof(LLMProviders.NONE)));
+            Assert.That(provider.ModelNameForUser(MODEL), Is.EqualTo("gpt-test"));
+        }
+    }
+
+    [Test]
+    public void AProviderWhichHidesItsIdentityNamesNothing()
+    {
+        var provider = new NoProvider { InstanceName = "My provider", HidesIdentity = true };
+
+        using (Assert.EnterMultipleScope())
+        {
+            Assert.That(provider.NameForUser, Does.Not.Contain("My provider"));
+            Assert.That(provider.TypeForUser, Does.Not.Contain(nameof(LLMProviders.NONE)));
+            Assert.That(provider.ModelNameForUser(MODEL), Does.Not.Contain("gpt-test"));
+        }
+    }
+}