Add tests for apikey config forwarding

Author: kzu

src/AI.Tests/ConfigurableTests.cs

@@ -33,4 +33,79 @@ public void CanConfigureClients()
         Assert.Equal("openai", openai.GetRequiredService<ChatClientMetadata>().ProviderName);
         Assert.Equal("xai", grok.GetRequiredService<ChatClientMetadata>().ProviderName);
     }
+
+    [Fact]
+    public void CanOverrideClientId()
+    {
+        var configuration = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["ai:clients:grok:id"] = "xai",
+                ["ai:clients:grok:modelid"] = "grok-4-fast",
+                ["ai:clients:grok:apikey"] = "xai-asdfasdf",
+                ["ai:clients:grok:endpoint"] = "https://api.x.ai",
+            })
+            .Build();
+
+        var calls = new List<string>();
+
+        var services = new ServiceCollection()
+            .AddSingleton<IConfiguration>(configuration)
+            .UseChatClients(configuration)
+            .BuildServiceProvider();
+
+        var grok = services.GetRequiredKeyedService<IChatClient>("xai");
+
+        Assert.Equal("xai", grok.GetRequiredService<ChatClientMetadata>().ProviderName);
+    }
+
+    [Fact]
+    public void CanSetApiKeyToConfiguration()
+    {
+        var configuration = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["keys:grok"] = "xai-asdfasdf",
+                ["ai:clients:grok:modelid"] = "grok-4-fast",
+                ["ai:clients:grok:apikey"] = "keys:grok",
+                ["ai:clients:grok:endpoint"] = "https://api.x.ai",
+            })
+            .Build();
+
+        var calls = new List<string>();
+
+        var services = new ServiceCollection()
+            .AddSingleton<IConfiguration>(configuration)
+            .UseChatClients(configuration)
+            .BuildServiceProvider();
+
+        var grok = services.GetRequiredKeyedService<IChatClient>("grok");
+
+        Assert.Equal("xai", grok.GetRequiredService<ChatClientMetadata>().ProviderName);
+    }
+
+    [Fact]
+    public void CanSetApiKeyToSection()
+    {
+        var configuration = new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["keys:grok:apikey"] = "xai-asdfasdf",
+                ["ai:clients:grok:modelid"] = "grok-4-fast",
+                ["ai:clients:grok:apikey"] = "keys:grok",
+                ["ai:clients:grok:endpoint"] = "https://api.x.ai",
+            })
+            .Build();
+
+        var calls = new List<string>();
+
+        var services = new ServiceCollection()
+            .AddSingleton<IConfiguration>(configuration)
+            .UseChatClients(configuration)
+            .BuildServiceProvider();
+
+        var grok = services.GetRequiredKeyedService<IChatClient>("grok");
+
+        Assert.Equal("xai", grok.GetRequiredService<ChatClientMetadata>().ProviderName);
+    }
 }