Add unit tests

src/cache-save.ts

@@ -2,8 +2,11 @@ import * as core from '@actions/core';
 import * as cache from '@actions/cache';
 import fs from 'fs';
 import {State} from './constants';
-import {getCacheDirectoryPath, getPackageManagerInfo} from './cache-utils';
-import {getCacheInput} from './utils';
+import {
+  getCacheDirectoryPath,
+  getPackageManagerInfo,
+  getCacheInput
+} from './cache-utils';
 
 // Catch and log any unhandled exceptions.  These exceptions can leak out of the uploadChunk method in
 // @actions/toolkit when a failed upload closes the file descriptor causing any in-process reads to

src/cache-utils.ts

@@ -2,6 +2,7 @@ import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 import {supportedPackageManagers, PackageManagerInfo} from './package-managers';
+import {isSelfHosted} from './utils';
 
 export const getCommandOutput = async (toolCommand: string) => {
   let {stdout, stderr, exitCode} = await exec.getExecOutput(
@@ -83,3 +84,9 @@ export function isCacheFeatureAvailable(): boolean {
   );
   return false;
 }
+export const getCacheInput = (): boolean => {
+  // for self-hosted environment turn off cache by default
+  if (isSelfHosted() && core.getInput('cache') === '') return false;
+
+  return core.getBooleanInput('cache');
+};

src/main.ts

@@ -4,11 +4,10 @@ import * as installer from './installer';
 import * as semver from 'semver';
 import path from 'path';
 import {restoreCache} from './cache-restore';
-import {isCacheFeatureAvailable} from './cache-utils';
+import {isCacheFeatureAvailable, getCacheInput} from './cache-utils';
 import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
-import {getCacheInput} from './utils';
 
 export async function run() {
   try {

src/utils.ts

@@ -7,11 +7,4 @@ export enum StableReleaseAlias {
 
 export const isSelfHosted = (): boolean =>
   process.env['RUNNER_ENVIRONMENT'] !== 'github-hosted' &&
-  process.env['AGENT_ISSELFHOSTED'] === '1';
-
-export const getCacheInput = (): boolean => {
-  // for self-hosted environment turn off cache by default
-  if (isSelfHosted() && core.getInput('cache') === '') return false;
-
-  return core.getBooleanInput('cache');
-};
+  process.env['AGENT_ISSELFHOSTED'] !== '0';