diff --git a/test/codex-multi-auth-wrapper.test.ts b/test/codex-multi-auth-wrapper.test.ts
new file mode 100644
index 00000000..ebd726d5
--- /dev/null
+++ b/test/codex-multi-auth-wrapper.test.ts
@@ -0,0 +1,70 @@
+import { spawnSync } from "node:child_process";
+import {
+	copyFileSync,
+	mkdirSync,
+	mkdtempSync,
+	readFileSync,
+	writeFileSync,
+} from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { removeWithRetry } from "./helpers/remove-with-retry.js";
+
+const tempRoots: string[] = [];
+
+afterEach(async () => {
+	while (tempRoots.length > 0) {
+		const root = tempRoots.pop();
+		if (root) {
+			await removeWithRetry(root, { recursive: true, force: true });
+		}
+	}
+});
+
+describe("codex-multi-auth wrapper", () => {
+	it("loads the built CLI entry and forwards args with package version env", () => {
+		const root = mkdtempSync(path.join(tmpdir(), "codex-multi-auth-wrapper-"));
+		tempRoots.push(root);
+		const scriptsDir = path.join(root, "scripts");
+		const distLibDir = path.join(root, "dist", "lib");
+		mkdirSync(scriptsDir, { recursive: true });
+		mkdirSync(distLibDir, { recursive: true });
+
+		copyFileSync(
+			path.join(process.cwd(), "scripts", "codex-multi-auth.js"),
+			path.join(scriptsDir, "codex-multi-auth.js"),
+		);
+		writeFileSync(
+			path.join(root, "package.json"),
+			JSON.stringify({ version: "9.9.9-test" }, null, 2),
+			"utf8",
+		);
+		writeFileSync(
+			path.join(distLibDir, "codex-manager.js"),
+			[
+				"export async function runCodexMultiAuthCli(args) {",
+				"  console.log('version=' + process.env.CODEX_MULTI_AUTH_CLI_VERSION);",
+				"  console.log('args=' + args.join(' '));",
+				"  return 0;",
+				"}",
+			].join("\n"),
+			"utf8",
+		);
+
+		const result = spawnSync(
+			process.execPath,
+			[path.join(scriptsDir, "codex-multi-auth.js"), "auth", "--help"],
+			{ cwd: root, encoding: "utf8" },
+		);
+
+		expect(result.status).toBe(0);
+		expect(result.stdout).toContain("version=9.9.9-test");
+		expect(result.stdout).toContain("args=auth --help");
+		const scriptText = readFileSync(
+			path.join(scriptsDir, "codex-multi-auth.js"),
+			"utf8",
+		);
+		expect(scriptText).toContain("runCodexMultiAuthCli");
+	});
+});