chore(tests): Mock arch to make tests pass on arm host (#191)

Also add Windows arm64 download link test now that arm64 runners exist for Windows.

Author: corneliusroemer

src/run.test.ts

@@ -67,7 +67,7 @@ describe('run.ts', () => {
       expect(os.arch).toHaveBeenCalled()
    })
 
-   test('getHelmDownloadURL() - return the URL to download helm for Windows', () => {
+   test('getHelmDownloadURL() - return the URL to download helm for Windows x64', () => {
       jest.spyOn(os, 'platform').mockReturnValue('win32')
       jest.spyOn(os, 'arch').mockReturnValue('x64')
 
@@ -76,6 +76,15 @@ describe('run.ts', () => {
       expect(os.platform).toHaveBeenCalled()
    })
 
+   test('getHelmDownloadURL() - return the URL to download helm for Windows arm64', () => {
+      jest.spyOn(os, 'platform').mockReturnValue('win32')
+      jest.spyOn(os, 'arch').mockReturnValue('arm64')
+
+      const expected = 'https://test.tld/helm-v3.8.0-windows-arm64.zip'
+      expect(run.getHelmDownloadURL(downloadBaseURL, 'v3.8.0')).toBe(expected)
+      expect(os.platform).toHaveBeenCalled()
+   })
+
    test('getLatestHelmVersion() - return the latest version of HELM', async () => {
       const res = {
          status: 200,
@@ -88,7 +97,7 @@ describe('run.ts', () => {
    test('getLatestHelmVersion() - return the stable version of HELM when simulating a network error', async () => {
       const errorMessage: string = 'Network Error'
       global.fetch = jest.fn().mockRejectedValueOnce(new Error(errorMessage))
-      expect(await run.getLatestHelmVersion()).toBe('v3.13.3')
+      expect(await run.getLatestHelmVersion()).toBe(run.stableHelmVersion)
    })
 
    test('getValidVersion() - return version with v prepended', () => {
@@ -204,6 +213,7 @@ describe('run.ts', () => {
       const response = JSON.stringify([{tag_name: 'v4.0.0'}])
       jest.spyOn(fs, 'readFileSync').mockReturnValue(response)
       jest.spyOn(os, 'platform').mockReturnValue('win32')
+      jest.spyOn(os, 'arch').mockReturnValue('x64')
       jest.spyOn(fs, 'chmodSync').mockImplementation(() => {})
       jest.spyOn(toolCache, 'extractZip').mockResolvedValue('extractedPath')
       jest.spyOn(toolCache, 'cacheDir').mockResolvedValue('pathToCachedDir')
@@ -239,6 +249,7 @@ describe('run.ts', () => {
          throw 'Unable to download'
       })
       jest.spyOn(os, 'platform').mockReturnValue('win32')
+      jest.spyOn(os, 'arch').mockReturnValue('x64')
 
       const downloadUrl = 'https://test.tld/helm-v3.2.1-windows-amd64.zip'
       await expect(run.downloadHelm(downloadBaseURL, 'v3.2.1')).rejects.toThrow(
@@ -254,6 +265,7 @@ describe('run.ts', () => {
       jest.spyOn(toolCache, 'downloadTool').mockResolvedValue('pathToTool')
       jest.spyOn(toolCache, 'extractZip').mockResolvedValue('extractedPath')
       jest.spyOn(os, 'platform').mockReturnValue('win32')
+      jest.spyOn(os, 'arch').mockReturnValue('x64')
       jest.spyOn(fs, 'chmodSync').mockImplementation(() => {})
       jest
          .spyOn(fs, 'readdirSync')
@@ -283,6 +295,7 @@ describe('run.ts', () => {
       jest.spyOn(toolCache, 'downloadTool').mockResolvedValue('pathToTool')
       jest.spyOn(toolCache, 'extractZip').mockResolvedValue('extractedPath')
       jest.spyOn(os, 'platform').mockReturnValue('win32')
+      jest.spyOn(os, 'arch').mockReturnValue('x64')
       jest.spyOn(fs, 'chmodSync').mockImplementation()
       jest.spyOn(fs, 'readdirSync').mockImplementation((file, _) => [])
       jest.spyOn(fs, 'statSync').mockImplementation((file) => {

src/run.ts

@@ -10,7 +10,7 @@ import * as toolCache from '@actions/tool-cache'
 import * as core from '@actions/core'
 
 const helmToolName = 'helm'
-const stableHelmVersion = 'v3.13.3'
+export const stableHelmVersion = 'v3.13.3'
 
 export async function run() {
    let version = core.getInput('version', {required: true})