fix: make promisify working by mocking the entire file-system

packages/providers/upload-local/package.json

@@ -49,9 +49,11 @@
   },
   "devDependencies": {
     "@strapi/pack-up": "4.15.5",
+    "@strapi/plugin-upload": "4.15.5",
     "@types/jest": "29.5.2",
     "eslint-config-custom": "4.15.5",
-    "tsconfig": "4.15.5"
+    "tsconfig": "4.15.5",
+    "memfs": "4.6.0"
   },
   "engines": {
     "node": ">=18.0.0 <=20.x.x",

packages/providers/upload-local/src/__tests__/upload-local.test.ts

@@ -1,22 +1,20 @@
+/* eslint-disable import/first */
+import { fs } from 'memfs';
+
+jest.mock('fs', () => fs);
+
+import fse from 'fs-extra';
+
 import type { File } from '@strapi/plugin-upload';
+
 import localProvider from '../index';
 
-jest.mock('fs', () => {
-  return {
-    writeFile: jest.fn((_path, _buffer, callback) => callback()),
-  };
-});
-
-jest.mock('fs-extra', () => {
-  return {
-    pathExistsSync: jest.fn(() => true),
-  };
-});
-
 describe('Local provider', () => {
   beforeAll(() => {
     globalThis.strapi = {};
     globalThis.strapi.dirs = { static: { public: '' } };
+
+    fse.ensureDirSync('uploads');
   });
 
   afterAll(() => {

yarn.lock

@@ -9790,6 +9790,7 @@ __metadata:
   resolution: "@strapi/provider-upload-local@workspace:packages/providers/upload-local"
   dependencies:
     "@strapi/pack-up": "npm:4.15.5"
+    "@strapi/plugin-upload": "npm:4.15.5"
     "@strapi/utils": "npm:4.15.5"
     "@types/jest": "npm:29.5.2"
     eslint-config-custom: "npm:4.15.5"