refactor(api): allow router handler injection in tests

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,
+    },
   );
 }