feat: added downloaded snapshots caching (#27)

Author: soumyamahunt

__tests__/installer/linux.test.ts

@@ -1,5 +1,6 @@
 import * as path from 'path'
 import * as exec from '@actions/exec'
+import * as cache from '@actions/cache'
 import * as toolCache from '@actions/tool-cache'
 import {coerce as parseSemVer} from 'semver'
 import {LinuxToolchainInstaller} from '../../src/installer/linux'
@@ -34,6 +35,8 @@ describe('linux toolchain installation verification', () => {
     )
 
     const download = path.resolve('tool', 'download', 'path')
+    jest.spyOn(cache, 'restoreCache').mockResolvedValue(undefined)
+    jest.spyOn(cache, 'saveCache').mockResolvedValue(1)
     jest.spyOn(toolCache, 'downloadTool').mockResolvedValue(download)
     jest.spyOn(exec, 'exec').mockResolvedValue(0)
     await expect(installer['download']()).resolves.toBe(download)
@@ -65,6 +68,8 @@ describe('linux toolchain installation verification', () => {
     const extracted = path.resolve('tool', 'extracted', 'path')
     const cached = path.resolve('tool', 'cached', 'path')
     const swiftPath = path.join(cached, 'usr', 'bin')
+    jest.spyOn(cache, 'restoreCache').mockResolvedValue(undefined)
+    jest.spyOn(cache, 'saveCache').mockResolvedValue(1)
     jest.spyOn(toolCache, 'find').mockReturnValue('')
     const downloadSpy = jest.spyOn(toolCache, 'downloadTool')
     downloadSpy.mockResolvedValue(download)

__tests__/installer/windows.test.ts

@@ -1,6 +1,7 @@
 import * as path from 'path'
 import {promises as fs} from 'fs'
 import * as exec from '@actions/exec'
+import * as cache from '@actions/cache'
 import * as toolCache from '@actions/tool-cache'
 import {coerce as parseSemVer} from 'semver'
 import {WindowsToolchainInstaller} from '../../src/installer/windows'
@@ -53,6 +54,8 @@ describe('windows toolchain installation verification', () => {
       stdout: JSON.stringify([visualStudio]),
       stderr: ''
     })
+    jest.spyOn(cache, 'restoreCache').mockResolvedValue(undefined)
+    jest.spyOn(cache, 'saveCache').mockResolvedValue(1)
     jest.spyOn(toolCache, 'downloadTool').mockResolvedValue(download)
     jest.spyOn(exec, 'exec').mockResolvedValue(0)
     await expect(installer['download']()).resolves.toBe(`${download}.exe`)

__tests__/installer/xcode.test.ts

@@ -1,6 +1,7 @@
 import * as path from 'path'
 import {promises as fs} from 'fs'
 import * as exec from '@actions/exec'
+import * as cache from '@actions/cache'
 import * as toolCache from '@actions/tool-cache'
 import {coerce as parseSemVer} from 'semver'
 import * as plist from 'plist'
@@ -56,6 +57,8 @@ describe('macOS toolchain installation verification', () => {
 
     const download = path.resolve('tool', 'download', 'path')
     jest.spyOn(installer, 'isInstallationNeeded').mockResolvedValue(true)
+    jest.spyOn(cache, 'restoreCache').mockResolvedValue(undefined)
+    jest.spyOn(cache, 'saveCache').mockResolvedValue(1)
     jest.spyOn(toolCache, 'downloadTool').mockResolvedValue(download)
     jest.spyOn(exec, 'exec').mockResolvedValue(0)
     await expect(installer['download']()).resolves.toBe(download)
@@ -95,6 +98,8 @@ describe('macOS toolchain installation verification', () => {
     const swiftPath = path.join(cached, 'usr', 'bin')
     const identifier = 'org.swift.581202305171a'
     jest.spyOn(installer, 'isInstallationNeeded').mockResolvedValue(true)
+    jest.spyOn(cache, 'restoreCache').mockResolvedValue(undefined)
+    jest.spyOn(cache, 'saveCache').mockResolvedValue(1)
     jest.spyOn(toolCache, 'find').mockReturnValue('')
     jest.spyOn(exec, 'exec').mockResolvedValue(0)
     const downloadSpy = jest.spyOn(toolCache, 'downloadTool')