form export 수정 및 통합테스트

tests/api/formsSubmit.spec.ts

@@ -185,6 +185,49 @@ describe("/api/forms/submit", () => {
     expect(json.message).toBe(config.successMessage);
   });
 
+  it("both 모드에서는 internal 처리 후 webhook 으로도 전송되어야 한다", async () => {
+    const destinationUrl = `${BASE_URL}/webhook-both`;
+
+    const config: FormBlockProps = {
+      kind: "contact",
+      submitTarget: "both",
+      destinationUrl,
+      method: "POST",
+      headers: { Authorization: "Bearer both-token" },
+      extraParams: { source: "builder-both" },
+      successMessage: "양쪽 모두 전송되었습니다.",
+      errorMessage: "both 모드 전송 실패",
+      fieldIds: [],
+      submitButtonId: null,
+    };
+
+    const fetchMock = vi.fn(async () => new Response("ok", { status: 200 }));
+    (globalThis as any).fetch = fetchMock;
+
+    const formData = new FormData();
+    formData.append("email_address", "both@example.com");
+    formData.append("__config", JSON.stringify(config));
+
+    const { POST: handleSubmit } = await import("@/app/api/forms/submit/route");
+
+    const res = await handleSubmit(
+      new Request(`${BASE_URL}/api/forms/submit`, {
+        method: "POST",
+        body: formData,
+      }),
+    );
+
+    expect(res.status).toBe(200);
+    const json = (await res.json()) as any;
+    expect(json.ok).toBe(true);
+    expect(json.message).toBe(config.successMessage);
+
+    expect(fetchMock).toHaveBeenCalledTimes(1);
+    const [url, options] = fetchMock.mock.calls[0] as [string, RequestInit];
+    expect(url).toBe(destinationUrl);
+    expect(options.method).toBe("POST");
+  });
+
   it("webhook 모드에서 destinationUrl 이 없으면 400 과 destinationUrl_missing 및 errorMessage 가 포함되어야 한다", async () => {
     const config: FormBlockProps = {
       kind: "contact",