test(app): spyToBeCalledTimesAsync is specific case of general verifier

this allows arbitrary verifier functions to be passed in, with the default
just being one that checks the callback count on the spy

Author: mikehardy

tests/globals.js

@@ -120,6 +120,12 @@ global.Utils = {
     return this.spyToBeCalledTimesAsync(spy, 1, timeout);
   },
   spyToBeCalledTimesAsync(spy, times = 2, timeout = 5000) {
+    const verifier = function (verifiedSpy) {
+      return verifiedSpy.callCount >= times;
+    };
+    return this.spyToBeCalledWithVerifierAsync(spy, verifier, timeout);
+  },
+  spyToBeCalledWithVerifierAsync(spy, verifier, timeout = 5000) {
     let interval;
     const { resolve, reject, promise } = Promise.defer();
     const timer = setTimeout(() => {
@@ -128,7 +134,7 @@ global.Utils = {
     }, timeout);
 
     interval = setInterval(() => {
-      if (spy.callCount >= times) {
+      if (verifier(spy)) {
         clearTimeout(timer);
         clearInterval(interval);
         resolve();