review comments

packages/cache/__tests__/cache.test.ts

@@ -0,0 +1,15 @@
+import * as cache from '../src/cache'
+
+test('isFeatureAvailable returns true if server url is set', () => {
+    try {
+      process.env['ACTIONS_CACHE_URL'] = 'http://cache.com'
+      expect(cache.isFeatureAvailable()).toBe(true)
+    } finally {
+      delete process.env['ACTIONS_CACHE_URL']
+    }
+  })
+  
+  test('isFeatureAvailable returns false if server url is not set', () => {
+    expect(cache.isFeatureAvailable()).toBe(false)
+  })
+