improve ga redirect push function #184 AG-12372

Merge in ADGUARD-FILTERS/scriptlets from fix/AG-12372_01 to release/v1.6

Squashed commit of the following:

commit 4d6e667
Author: Stanislav A <s.atroschenko@adguard.com>
Date:   Wed Feb 9 19:45:50 2022 +0300

    revert .length assertion

commit 7fa416a
Author: Stanislav A <s.atroschenko@adguard.com>
Date:   Wed Feb 9 18:29:13 2022 +0300

    improve ga redirect

src/redirects/googlesyndication-adsbygoogle.js

@@ -22,11 +22,23 @@ export function GoogleSyndicationAdsByGoogle(source) {
         // length: 0,
         loaded: true,
         // https://github.com/AdguardTeam/Scriptlets/issues/184
-        push(arg) { // eslint-disable-line no-unused-vars
+        push(arg) {
             if (typeof this.length === 'undefined') {
                 this.length = 0;
                 this.length += 1;
             }
+            if (arg !== null && arg instanceof Object && arg.constructor.name === 'Object') {
+                // eslint-disable-next-line no-restricted-syntax
+                for (const key of Object.keys(arg)) {
+                    if (typeof arg[key] === 'function') {
+                        try {
+                            arg[key].call();
+                        } catch {
+                            /* empty */
+                        }
+                    }
+                }
+            }
         },
     };
     const adElems = document.querySelectorAll('.adsbygoogle');

tests/redirects/googlesyndication-adsbygoogle.test.js

@@ -50,7 +50,6 @@ test('Checking if alias name works', (assert) => {
 
 test('Redirect testing', (assert) => {
     const ad = createAdElement();
-
     runRedirect(name);
 
     // check if iframes were created by scriptlet
@@ -70,9 +69,14 @@ test('Redirect testing', (assert) => {
 
     assert.strictEqual(window.adsbygoogle.length, undefined, 'adsbygoogle.length check');
     assert.strictEqual(window.adsbygoogle.push.length, 1, 'push.length check');
-
-    // check if API was mocked
-    window.adsbygoogle.push('somedata');
+    const pushCallback = () => {
+        assert.ok(true, 'callback was called');
+    };
+    const pushArg = {
+        test: 'test',
+        callback: pushCallback,
+    };
+    window.adsbygoogle.push(pushArg);
     assert.strictEqual(window.adsbygoogle.length, 1, 'API was mocked');
 
     removeBodyElement(ad);