Mock fs.existsSync in tests

Author: jacobwgillespie

__tests__/cache-save.test.ts

@@ -1,6 +1,7 @@
 import * as core from '@actions/core';
 import * as cache from '@actions/cache';
 import * as glob from '@actions/glob';
+import fs from 'fs';
 import path from 'path';
 
 import * as utils from '../src/cache-utils';
@@ -28,6 +29,7 @@ describe('run', () => {
  let saveCacheSpy: jest.SpyInstance;
  let getCommandOutputSpy: jest.SpyInstance;
  let hashFilesSpy: jest.SpyInstance;
+ let existsSpy: jest.SpyInstance;
 
  beforeEach(() => {
  getInputSpy = jest.spyOn(core, 'getInput');
@@ -63,6 +65,9 @@ describe('run', () => {
  }
  });
 
+ existsSpy = jest.spyOn(fs, 'existsSync');
+ existsSpy.mockImplementation(() => true);
+
  // utils
  getCommandOutputSpy = jest.spyOn(utils, 'getCommandOutput');
  });