Use keyprefix if a cache managed by yarn

Yarn can remove obsolete dependencie so we can re-use the previous cache
without its infinitive growing

Author: dsame

__tests__/cache-restore.test.ts

@@ -45,13 +45,15 @@ describe('cache-restore', () => {
     }
   }
 
+  let inputs = {} as any;
   let saveStateSpy: jest.SpyInstance;
   let infoSpy: jest.SpyInstance;
   let debugSpy: jest.SpyInstance;
   let setOutputSpy: jest.SpyInstance;
   let getCommandOutputSpy: jest.SpyInstance;
   let restoreCacheSpy: jest.SpyInstance;
   let hashFilesSpy: jest.SpyInstance;
+  let inSpy: jest.SpyInstance;
 
   beforeEach(() => {
     // core
@@ -67,6 +69,10 @@ describe('cache-restore', () => {
     saveStateSpy = jest.spyOn(core, 'saveState');
     saveStateSpy.mockImplementation(() => undefined);
 
+    inputs = {};
+    inSpy = jest.spyOn(core, 'getInput');
+    inSpy.mockImplementation(name => inputs[name]);
+
     // glob
     hashFilesSpy = jest.spyOn(glob, 'hashFiles');
     hashFilesSpy.mockImplementation((pattern: string) => {
@@ -131,11 +137,12 @@ describe('cache-restore', () => {
             return findCacheFolder(command);
           }
         });
+        inputs['node-version'] = 'vABC';
 
         await restoreCache(packageManager, '');
         expect(hashFilesSpy).toHaveBeenCalled();
         expect(infoSpy).toHaveBeenCalledWith(
-          `Cache restored from key: node-cache-${platform}-${packageManager}-v2-${fileHash}`
+          `Cache restored from key: node-cache-${platform}-${packageManager}-v2-vABC-${fileHash}`
         );
         expect(infoSpy).not.toHaveBeenCalledWith(
           `${packageManager} cache is not found`