diff --git a/test/api-router_test.ts b/test/api-router_test.ts
index 83b9cf3..2977fe3 100644
--- a/test/api-router_test.ts
+++ b/test/api-router_test.ts
@@ -1,5 +1,6 @@
 import { assertEquals } from 'jsr:@std/assert@^1.0.0';
 import { EventEmitter } from 'node:events';
+import { AuthMiddleware } from '../ts/api/middleware/auth.ts';
 import { ApiRouter } from '../ts/api/router.ts';
 
 class TestResponse {
@@ -49,6 +50,38 @@ function createRouter(): ApiRouter {
     {} as never,
     {} as never,
     ['valid-key'],
+    {
+      authMiddleware: new AuthMiddleware(['valid-key']),
+      sanityMiddleware: {
+        validateChatRequest() {
+          return { valid: true };
+        },
+        sanitizeChatRequest(body: Record<string, unknown>) {
+          return body;
+        },
+        validateEmbeddingsRequest() {
+          return { valid: true };
+        },
+        sanitizeEmbeddingsRequest(body: Record<string, unknown>) {
+          return body;
+        },
+      } as never,
+      chatHandler: {
+        async handleChatCompletion() {
+          throw new Error('chat handler should not run in this test');
+        },
+      } as never,
+      modelsHandler: {
+        async handleListModels() {
+          throw new Error('models handler should not run in this test');
+        },
+      } as never,
+      embeddingsHandler: {
+        async handleEmbeddings() {
+          throw new Error('embeddings handler should not run in this test');
+        },
+      } as never,
+    },
   );
 }
 
diff --git a/ts/api/router.ts b/ts/api/router.ts
index 501ea60..fbaee3a 100644
--- a/ts/api/router.ts
+++ b/ts/api/router.ts
@@ -22,6 +22,14 @@ interface IParsedRequestBody {
   body?: unknown;
 }
 
+interface IApiRouterOptions {
+  chatHandler?: ChatHandler;
+  modelsHandler?: ModelsHandler;
+  embeddingsHandler?: EmbeddingsHandler;
+  authMiddleware?: AuthMiddleware;
+  sanityMiddleware?: SanityMiddleware;
+}
+
 /**
  * API Router - routes requests to handlers
  */
@@ -42,6 +50,7 @@ export class ApiRouter {
     modelLoader: ModelLoader,
     clusterCoordinator: ClusterCoordinator,
     apiKeys: string[],
+    options: IApiRouterOptions = {},
   ) {
     this.containerManager = containerManager;
     this.modelRegistry = modelRegistry;
@@ -49,22 +58,23 @@ export class ApiRouter {
     this.clusterCoordinator = clusterCoordinator;
 
     // Initialize handlers
-    this.chatHandler = new ChatHandler(
+    this.chatHandler = options.chatHandler || new ChatHandler(
       containerManager,
       modelRegistry,
       modelLoader,
       clusterCoordinator,
     );
-    this.modelsHandler = new ModelsHandler(containerManager, modelRegistry, clusterCoordinator);
-    this.embeddingsHandler = new EmbeddingsHandler(
+    this.modelsHandler =
+      options.modelsHandler || new ModelsHandler(containerManager, modelRegistry, clusterCoordinator);
+    this.embeddingsHandler = options.embeddingsHandler || new EmbeddingsHandler(
       containerManager,
       modelRegistry,
       clusterCoordinator,
     );
 
     // Initialize middleware
-    this.authMiddleware = new AuthMiddleware(apiKeys);
-    this.sanityMiddleware = new SanityMiddleware(modelRegistry);
+    this.authMiddleware = options.authMiddleware || new AuthMiddleware(apiKeys);
+    this.sanityMiddleware = options.sanityMiddleware || new SanityMiddleware(modelRegistry);
   }
 
   /**