实现报销材料连续预览（07-27-yang-jun-reimbursement-readiness）

server/tests/unit/services/invoiceDocumentMeta.test.js

@@ -0,0 +1,25 @@
+const { mapInvoiceDocumentMeta } = require("../../../src/services/invoiceDocumentMeta");
+
+describe("invoice document metadata", () => {
+  it("exposes only supported document categories and a bounded subtype", () => {
+    expect(mapInvoiceDocumentMeta({
+      ocr_result: {
+        result_json: {
+          documentCategory: " electronic_train_ticket ",
+          documentSubtype: `ElectronicTrainTicketFull${"x".repeat(80)}`,
+          raw: { sensitive: true },
+        },
+      },
+    })).toEqual({
+      documentCategory: "electronic_train_ticket",
+      documentSubtype: `ElectronicTrainTicketFull${"x".repeat(39)}`,
+    });
+  });
+
+  it("fails closed for unknown, blank, or malformed OCR metadata", () => {
+    expect(mapInvoiceDocumentMeta({
+      ocr_result: { result_json: { documentCategory: "unknown_invoice", documentSubtype: " " } },
+    })).toEqual({ documentCategory: null, documentSubtype: null });
+    expect(mapInvoiceDocumentMeta(null)).toEqual({ documentCategory: null, documentSubtype: null });
+  });
+});