修复企微通讯录生产导入兼容性（07-26-internal-ops-recovery-baseline）

server/tests/unit/scripts/import-wecom-directory-export.test.js

@@ -1,3 +1,4 @@
+const fs = require("node:fs");
 const ExcelJS = require("exceljs");
 
 const {
@@ -5,6 +6,7 @@ const {
   buildSafeReport,
   parseArgs,
   parseDirectoryExport,
+  readStdinBuffer,
 } = require("../../../src/scripts/import-wecom-directory-export");
 
 async function buildDirectoryWorkbook(rows) {
@@ -39,6 +41,17 @@ async function buildDirectoryWorkbook(rows) {
 }
 
 describe("WeCom directory export importer", () => {
+  it("reads stdin through the fd-compatible synchronous API", () => {
+    const expected = Buffer.from("synthetic-xlsx");
+    const readFileSync = vi.spyOn(fs, "readFileSync").mockReturnValue(expected);
+    try {
+      expect(readStdinBuffer()).toBe(expected);
+      expect(readFileSync).toHaveBeenCalledWith(0);
+    } finally {
+      readFileSync.mockRestore();
+    }
+  });
+
   it("requires stdin, the apply environment gate, and an actor for apply", () => {
     const previous = process.env.WECOM_DIRECTORY_EXPORT_APPLY;
     delete process.env.WECOM_DIRECTORY_EXPORT_APPLY;