diff --git a/src/config/model-alias-defaults.test.ts b/src/config/model-alias-defaults.test.ts
index 62afb0a6bc..015feeac36 100644
--- a/src/config/model-alias-defaults.test.ts
+++ b/src/config/model-alias-defaults.test.ts
@@ -4,6 +4,31 @@ import { applyModelDefaults } from "./defaults.js";
 import type { OpenClawConfig } from "./types.js";
 
 describe("applyModelDefaults", () => {
+  function buildProxyProviderConfig(overrides?: { contextWindow?: number; maxTokens?: number }) {
+    return {
+      models: {
+        providers: {
+          myproxy: {
+            baseUrl: "https://proxy.example/v1",
+            apiKey: "sk-test",
+            api: "openai-completions",
+            models: [
+              {
+                id: "gpt-5.2",
+                name: "GPT-5.2",
+                reasoning: false,
+                input: ["text"],
+                cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+                contextWindow: overrides?.contextWindow ?? 200_000,
+                maxTokens: overrides?.maxTokens ?? 8192,
+              },
+            ],
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+  }
+
   it("adds default aliases when models are present", () => {
     const cfg = {
       agents: {
@@ -58,28 +83,7 @@ describe("applyModelDefaults", () => {
   });
 
   it("fills missing model provider defaults", () => {
-    const cfg = {
-      models: {
-        providers: {
-          myproxy: {
-            baseUrl: "https://proxy.example/v1",
-            apiKey: "sk-test",
-            api: "openai-completions",
-            models: [
-              {
-                id: "gpt-5.2",
-                name: "GPT-5.2",
-                reasoning: false,
-                input: ["text"],
-                cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
-                contextWindow: 200_000,
-                maxTokens: 8192,
-              },
-            ],
-          },
-        },
-      },
-    } satisfies OpenClawConfig;
+    const cfg = buildProxyProviderConfig();
 
     const next = applyModelDefaults(cfg);
     const model = next.models?.providers?.myproxy?.models?.[0];
@@ -92,28 +96,7 @@ describe("applyModelDefaults", () => {
   });
 
   it("clamps maxTokens to contextWindow", () => {
-    const cfg = {
-      models: {
-        providers: {
-          myproxy: {
-            baseUrl: "https://proxy.example/v1",
-            apiKey: "sk-test",
-            api: "openai-completions",
-            models: [
-              {
-                id: "gpt-5.2",
-                name: "GPT-5.2",
-                reasoning: false,
-                input: ["text"],
-                cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
-                contextWindow: 32768,
-                maxTokens: 40960,
-              },
-            ],
-          },
-        },
-      },
-    } satisfies OpenClawConfig;
+    const cfg = buildProxyProviderConfig({ contextWindow: 32768, maxTokens: 40960 });
 
     const next = applyModelDefaults(cfg);
     const model = next.models?.providers?.myproxy?.models?.[0];