diff --git a/__tests__/cache.test.ts b/__tests__/cache.test.ts
index b748e802..c2e1f777 100644
--- a/__tests__/cache.test.ts
+++ b/__tests__/cache.test.ts
@@ -1,7 +1,7 @@
 import { mkdtempSync } from 'fs';
 import { tmpdir } from 'os';
 import { join } from 'path';
-import { restore, save } from '../src/cache';
+import { computeCacheKey, findPackageManager, restore, save } from '../src/cache';
 import * as fs from 'fs';
 import * as os from 'os';
 import * as core from '@actions/core';
@@ -92,6 +92,19 @@ describe('dependency cache', () => {
         expect(spyWarning).not.toBeCalled();
         expect(spyInfo).toBeCalledWith('maven cache is not found');
       });
+      it('generates same cache key for every supported OS', async () => {
+        const packageManager = findPackageManager('maven');
+
+        process.env['RUNNER_OS'] = 'Windows';
+        const keyForWin = await computeCacheKey(packageManager);
+        process.env['RUNNER_OS'] = 'Linux';
+        const keyForLinux = await computeCacheKey(packageManager);
+        process.env['RUNNER_OS'] = 'macOS';
+        const keyForMacOS = await computeCacheKey(packageManager);
+
+        expect(keyForWin).toBe(keyForLinux);
+        expect(keyForWin).toBe(keyForMacOS);
+      });
     });
     describe('for gradle', () => {
       it('throws error if no build.gradle found', async () => {
@@ -117,6 +130,19 @@ describe('dependency cache', () => {
         expect(spyWarning).not.toBeCalled();
         expect(spyInfo).toBeCalledWith('gradle cache is not found');
       });
+      it('generates same cache key for every supported OS', async () => {
+        const packageManager = findPackageManager('gradle');
+
+        process.env['RUNNER_OS'] = 'Windows';
+        const keyForWin = await computeCacheKey(packageManager);
+        process.env['RUNNER_OS'] = 'Linux';
+        const keyForLinux = await computeCacheKey(packageManager);
+        process.env['RUNNER_OS'] = 'macOS';
+        const keyForMacOS = await computeCacheKey(packageManager);
+
+        expect(keyForWin).toEqual(keyForLinux);
+        expect(keyForWin).toEqual(keyForMacOS);
+      });
     });
   });
   describe('save', () => {
diff --git a/dist/cleanup/index.js b/dist/cleanup/index.js
index bbc65296..634f90ed 100644
--- a/dist/cleanup/index.js
+++ b/dist/cleanup/index.js
@@ -64536,7 +64536,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.save = exports.restore = void 0;
+exports.save = exports.restore = exports.computeCacheKey = exports.findPackageManager = void 0;
 const path_1 = __webpack_require__(622);
 const os_1 = __importDefault(__webpack_require__(87));
 const cache = __importStar(__webpack_require__(692));
@@ -64566,6 +64566,7 @@ function findPackageManager(id) {
     }
     return packageManager;
 }
+exports.findPackageManager = findPackageManager;
 /**
  * A function that generates a cache key to use.
  * Format of the generated key will be "${{ platform }}-${{ id }}-${{ fileHash }}"".
@@ -64578,6 +64579,7 @@ function computeCacheKey(packageManager) {
         return `${CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${packageManager.id}-${hash}`;
     });
 }
+exports.computeCacheKey = computeCacheKey;
 /**
  * Restore the dependency cache
  * @param id ID of the package manager, should be "maven" or "gradle"
diff --git a/dist/setup/index.js b/dist/setup/index.js
index d8f0e773..bb0ff4fa 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -18923,7 +18923,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.save = exports.restore = void 0;
+exports.save = exports.restore = exports.computeCacheKey = exports.findPackageManager = void 0;
 const path_1 = __webpack_require__(622);
 const os_1 = __importDefault(__webpack_require__(87));
 const cache = __importStar(__webpack_require__(692));
@@ -18953,6 +18953,7 @@ function findPackageManager(id) {
     }
     return packageManager;
 }
+exports.findPackageManager = findPackageManager;
 /**
  * A function that generates a cache key to use.
  * Format of the generated key will be "${{ platform }}-${{ id }}-${{ fileHash }}"".
@@ -18965,6 +18966,7 @@ function computeCacheKey(packageManager) {
         return `${CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${packageManager.id}-${hash}`;
     });
 }
+exports.computeCacheKey = computeCacheKey;
 /**
  * Restore the dependency cache
  * @param id ID of the package manager, should be "maven" or "gradle"
diff --git a/src/cache.ts b/src/cache.ts
index fb97fb0b..4afcadbf 100644
--- a/src/cache.ts
+++ b/src/cache.ts
@@ -35,7 +35,7 @@ const supportedPackageManager: PackageManager[] = [
   }
 ];
 
-function findPackageManager(id: string): PackageManager {
+export function findPackageManager(id: string): PackageManager {
   const packageManager = supportedPackageManager.find(packageManager => packageManager.id === id);
   if (packageManager === undefined) {
     throw new Error(`unknown package manager specified: ${id}`);
@@ -49,7 +49,7 @@ function findPackageManager(id: string): PackageManager {
  * If there is no file matched to {@link PackageManager.path}, the generated key ends with a dash (-).
  * @see {@link https://docs.github.com/en/actions/guides/caching-dependencies-to-speed-up-workflows#matching-a-cache-key|spec of cache key}
  */
-async function computeCacheKey(packageManager: PackageManager) {
+export async function computeCacheKey(packageManager: PackageManager) {
   const hash = await glob.hashFiles(packageManager.pattern.join('\n'));
   return `${CACHE_KEY_PREFIX}-${process.env['RUNNER_OS']}-${packageManager.id}-${hash}`;
 }