MockCfEnv can work more like regular CfEnv

Author: rlindner81

test/__mocks__/cf-env.js

@@ -1,17 +1,21 @@
 "use strict";
 
-const cfEnv = {
+class CfEnv {
   _reset() {
     this.isOnCf = false;
     this.cfApp = {};
     this.cfServices = {};
     this.cfServiceCredentialsForLabel = jest.fn().mockReturnValue({});
-  },
-};
-cfEnv._reset();
-
-const CfEnv = {
-  getInstance: () => cfEnv,
-};
+  }
+  constructor() {
+    this._reset();
+  }
+  static getInstance() {
+    if (!CfEnv.__instance) {
+      CfEnv.__instance = new CfEnv();
+    }
+    return CfEnv.__instance;
+  }
+}
 
 module.exports = { CfEnv };