Restore server error test and confirm logCacheError function removal

Co-authored-by: Link- <568794+Link-@users.noreply.github.com>

packages/cache/__tests__/saveCache.test.ts

@@ -221,6 +221,66 @@ test('save with reserve cache failure should fail', async () => {
   expect(getCompressionMock).toHaveBeenCalledTimes(1)
 })
 
+test('save with server error should fail', async () => {
+  const filePath = 'node_modules'
+  const primaryKey = 'Linux-node-bb828da54c148048dd17899ba9fda624811cfb43'
+  const logErrorMock = jest.spyOn(core, 'error')
+  const logWarningMock = jest.spyOn(core, 'warning')
+
+  // Mock cache service version to V2
+  const getCacheServiceVersionMock = jest.spyOn(config, 'getCacheServiceVersion').mockReturnValue('v2')
+
+  // Mock V2 CreateCacheEntry to succeed
+  const createCacheEntryMock = jest
+    .spyOn(CacheServiceClientJSON.prototype, 'CreateCacheEntry')
+    .mockReturnValue(
+      Promise.resolve({ok: true, signedUploadUrl: 'https://blob-storage.local?signed=true'})
+    )
+
+  // Mock the FinalizeCacheEntryUpload to succeed (since the error should happen in saveCache)
+  const finalizeCacheEntryMock = jest
+    .spyOn(CacheServiceClientJSON.prototype, 'FinalizeCacheEntryUpload')
+    .mockReturnValue(Promise.resolve({ok: true, entryId: '4'}))
+
+  const createTarMock = jest.spyOn(tar, 'createTar')
+
+  // Mock the saveCache call to throw a server error
+  const saveCacheMock = jest
+    .spyOn(cacheHttpClient, 'saveCache')
+    .mockImplementationOnce(() => {
+      throw new HttpClientError('HTTP Error Occurred', 500)
+    })
+
+  const compression = CompressionMethod.Zstd
+  const getCompressionMock = jest
+    .spyOn(cacheUtils, 'getCompressionMethod')
+    .mockReturnValueOnce(Promise.resolve(compression))
+
+  await saveCache([filePath], primaryKey)
+  
+  expect(logErrorMock).toHaveBeenCalledTimes(1)
+  expect(logErrorMock).toHaveBeenCalledWith(
+    'Failed to save: HTTP Error Occurred'
+  )
+
+  expect(createCacheEntryMock).toHaveBeenCalledTimes(1)
+  const archiveFolder = '/foo/bar'
+  const cachePaths = [path.resolve(filePath)]
+  const archiveFile = path.join(archiveFolder, CacheFilename.Zstd)
+  expect(createTarMock).toHaveBeenCalledTimes(1)
+  expect(createTarMock).toHaveBeenCalledWith(
+    archiveFolder,
+    cachePaths,
+    compression
+  )
+  expect(saveCacheMock).toHaveBeenCalledTimes(1)
+  expect(getCompressionMock).toHaveBeenCalledTimes(1)
+  expect(getCompressionMock).toHaveBeenCalledTimes(1)
+  
+  // Restore the getCacheServiceVersion mock to its original state
+  getCacheServiceVersionMock.mockRestore()
+})
+
 test('save with valid inputs uploads a cache', async () => {
   const filePath = 'node_modules'
   const primaryKey = 'Linux-node-bb828da54c148048dd17899ba9fda624811cfb43'