added test case

packages/cache/__tests__/cacheUtils.test.ts

@@ -32,3 +32,17 @@ test('assertDefined throws if undefined', () => {
 test('assertDefined returns value', () => {
   expect(cacheUtils.assertDefined('test', 5)).toBe(5)
 })
+
+test("isFeatureAvailable returns true if server url is set", () => {
+  try {
+      process.env["ACTIONS_CACHE_URL"] = "http://cache.com";
+      expect(cacheUtils.isFeatureAvailable()).toBe(true);
+  } finally {
+     delete process.env["ACTIONS_CACHE_URL"]
+  }
+});
+
+test("isFeatureAvailable returns false if server url is not set", () => {
+  expect(cacheUtils.isFeatureAvailable()).toBe(false);
+});
+

packages/cache/src/cache.ts

@@ -50,11 +50,7 @@ function checkKey(key: string): void {
  */
 
 export function isFeatureAvailable(): boolean {
-  if (process.env['ACTIONS_CACHE_URL']) {
-    return true
-  }
-
-  return false
+  return utils.isFeatureAvailable();
 }
 
 /**

packages/cache/src/internal/cacheUtils.ts

@@ -123,3 +123,11 @@ export function assertDefined<T>(name: string, value?: T): T {
 
   return value
 }
+
+export function isFeatureAvailable(): boolean {
+  if (process.env["ACTIONS_CACHE_URL"]) {
+    return true
+  }
+  
+  return false
+}