diff --git a/src/gateway/openai-http.test.ts b/src/gateway/openai-http.test.ts
index f3ab97093ba..82130807a1b 100644
--- a/src/gateway/openai-http.test.ts
+++ b/src/gateway/openai-http.test.ts
@@ -137,6 +137,19 @@ describe("OpenAI-compatible HTTP API (e2e)", () => {
           }
         | undefined;
     const getFirstAgentMessage = () => getFirstAgentCall()?.message ?? "";
+    const expectInvalidRequestNoDispatch = async (messages: unknown[]) => {
+      agentCommand.mockClear();
+      const res = await postChatCompletions(port, {
+        model: "openclaw",
+        messages,
+      });
+      expect(res.status).toBe(400);
+      const json = (await res.json()) as Record<string, unknown>;
+      expect((json.error as Record<string, unknown> | undefined)?.type).toBe(
+        "invalid_request_error",
+      );
+      expect(agentCommand).toHaveBeenCalledTimes(0);
+    };
     const postSyncUserMessage = async (message: string) => {
       const res = await postChatCompletions(port, {
         stream: false,
@@ -308,27 +321,17 @@ describe("OpenAI-compatible HTTP API (e2e)", () => {
       }
 
       {
-        agentCommand.mockClear();
-        const res = await postChatCompletions(port, {
-          model: "openclaw",
-          messages: [
-            {
-              role: "user",
-              content: [
-                {
-                  type: "image_url",
-                  image_url: { url: "https://example.com/image.png" },
-                },
-              ],
-            },
-          ],
-        });
-        expect(res.status).toBe(400);
-        const json = (await res.json()) as Record<string, unknown>;
-        expect((json.error as Record<string, unknown> | undefined)?.type).toBe(
-          "invalid_request_error",
-        );
-        expect(agentCommand).toHaveBeenCalledTimes(0);
+        await expectInvalidRequestNoDispatch([
+          {
+            role: "user",
+            content: [
+              {
+                type: "image_url",
+                image_url: { url: "https://example.com/image.png" },
+              },
+            ],
+          },
+        ]);
       }
 
       {
@@ -423,50 +426,30 @@ describe("OpenAI-compatible HTTP API (e2e)", () => {
       }
 
       {
-        agentCommand.mockClear();
-        const res = await postChatCompletions(port, {
-          model: "openclaw",
-          messages: [
-            {
-              role: "user",
-              content: [
-                {
-                  type: "image_url",
-                  image_url: { url: "data:application/pdf;base64,QUJDRA==" },
-                },
-              ],
-            },
-          ],
-        });
-        expect(res.status).toBe(400);
-        const json = (await res.json()) as Record<string, unknown>;
-        expect((json.error as Record<string, unknown> | undefined)?.type).toBe(
-          "invalid_request_error",
-        );
-        expect(agentCommand).toHaveBeenCalledTimes(0);
+        await expectInvalidRequestNoDispatch([
+          {
+            role: "user",
+            content: [
+              {
+                type: "image_url",
+                image_url: { url: "data:application/pdf;base64,QUJDRA==" },
+              },
+            ],
+          },
+        ]);
       }
 
       {
-        agentCommand.mockClear();
         const manyImageParts = Array.from({ length: 9 }).map(() => ({
           type: "image_url",
           image_url: { url: "data:image/png;base64,QUJDRA==" },
         }));
-        const res = await postChatCompletions(port, {
-          model: "openclaw",
-          messages: [
-            {
-              role: "user",
-              content: manyImageParts,
-            },
-          ],
-        });
-        expect(res.status).toBe(400);
-        const json = (await res.json()) as Record<string, unknown>;
-        expect((json.error as Record<string, unknown> | undefined)?.type).toBe(
-          "invalid_request_error",
-        );
-        expect(agentCommand).toHaveBeenCalledTimes(0);
+        await expectInvalidRequestNoDispatch([
+          {
+            role: "user",
+            content: manyImageParts,
+          },
+        ]);
       }
 
       {