Core: fix bug where queue is processed before processQueue is called (p…

…rebid#12528)

src/prebid.js

@@ -967,12 +967,12 @@ pbjsInstance.que.push(() => listenMessagesFromCreative());
  * by prebid once it's done loading. If it runs after prebid loads, then this monkey-patch causes their
  * function to execute immediately.
  *
- * @memberof pbjs
  * @param  {function} command A function which takes no arguments. This is guaranteed to run exactly once, and only after
  *                            the Prebid script has been fully loaded.
  * @alias module:pbjs.cmd.push
+ * @alias module:pbjs.que.push
  */
-pbjsInstance.cmd.push = function (command) {
+function quePush(command) {
   if (typeof command === 'function') {
     try {
       command.call();
@@ -982,9 +982,7 @@ pbjsInstance.cmd.push = function (command) {
   } else {
     logError('Commands written into $$PREBID_GLOBAL$$.cmd.push must be wrapped in a function');
   }
-};
-
-pbjsInstance.que.push = pbjsInstance.cmd.push;
+}
 
 function processQueue(queue) {
   queue.forEach(function (cmd) {
@@ -1003,6 +1001,7 @@ function processQueue(queue) {
  * @alias module:pbjs.processQueue
  */
 pbjsInstance.processQueue = function () {
+  pbjsInstance.que.push = pbjsInstance.cmd.push = quePush;
   insertLocatorFrame();
   hook.ready();
   processQueue(pbjsInstance.que);

test/spec/unit/pbjs_api_spec.js

@@ -237,9 +237,21 @@ describe('Unit: Prebid Module', function () {
     getBidToRender.getHooks({hook: getBidToRenderHook}).remove();
   });
 
-  it('should insert a locator frame on the page', () => {
-    $$PREBID_GLOBAL$$.processQueue();
-    expect(window.frames[PB_LOCATOR]).to.exist;
+  describe('processQueue', () => {
+    it('should insert a locator frame on the page', () => {
+      $$PREBID_GLOBAL$$.processQueue();
+      expect(window.frames[PB_LOCATOR]).to.exist;
+    });
+
+    ['cmd', 'que'].forEach(prop => {
+      it(`should patch ${prop}.push`, () => {
+        $$PREBID_GLOBAL$$[prop].push = false;
+        $$PREBID_GLOBAL$$.processQueue();
+        let ran = false;
+        $$PREBID_GLOBAL$$[prop].push(() => { ran = true; });
+        expect(ran).to.be.true;
+      })
+    })
   })
 
   describe('and global adUnits', () => {
@@ -262,10 +274,10 @@ describe('Unit: Prebid Module', function () {
 
     beforeEach(() => {
       $$PREBID_GLOBAL$$.requestBids.before(deferringHook, 99);
-      $$PREBID_GLOBAL$$.adUnits.splice(0, $$PREBID_GLOBAL$$.adUnits.length, ...startingAdUnits);
       hookRan = new Promise((resolve) => {
         done = resolve;
       });
+      $$PREBID_GLOBAL$$.adUnits.splice(0, $$PREBID_GLOBAL$$.adUnits.length, ...startingAdUnits);
     });
 
     afterEach(() => {