From d96fb0642fa89991d75ef685db3d9baacd653366 Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Thu, 21 Sep 2023 10:53:23 +0200
Subject: [PATCH] backend-test-utils: add DirectoryMocker.mockOsTmpDir

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
---
 .../src/files/DirectoryMocker.ts                 | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/packages/backend-test-utils/src/files/DirectoryMocker.ts b/packages/backend-test-utils/src/files/DirectoryMocker.ts
index 593b2790c4..0422969762 100644
--- a/packages/backend-test-utils/src/files/DirectoryMocker.ts
+++ b/packages/backend-test-utils/src/files/DirectoryMocker.ts
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import os from 'os';
 import { isChildPath, resolveSafeChildPath } from '@backstage/backend-common';
 import fs from 'fs-extra';
 import textextensions from 'textextensions';
@@ -83,6 +84,21 @@ export class DirectoryMocker {
     return mocker;
   }
 
+  static mockOsTmpDir() {
+    const mocker = DirectoryMocker.create();
+    const origTmpdir = os.tmpdir;
+    os.tmpdir = () => mocker.path;
+
+    try {
+      afterAll(() => {
+        os.tmpdir = origTmpdir;
+      });
+    } catch {
+      /* ignore */
+    }
+    return mocker;
+  }
+
   readonly #root: string;
 
   private constructor(root: string) {