❄️ Fix flaky amp-a4a tests (#40049)

Author: danielrozenberg

extensions/amp-a4a/0.1/test/test-amp-a4a.js

@@ -918,7 +918,7 @@ describes.realWin('amp-a4a', {amp: true}, (env) => {
         a4a.onLayoutMeasure();
         await a4a.layoutCallback();
         verifyCachedContentIframeRender(a4aElement, TEST_URL, true);
-        expect(a4a.iframe.getAttribute('allow')).to.equal("sync-xhr 'none';");
+        expect(a4a.iframe.getAttribute('allow')).to.include("sync-xhr 'none';");
       });
 
       it('should set feature policy for attribution-reporting when supported', async () => {
@@ -929,8 +929,9 @@ describes.realWin('amp-a4a', {amp: true}, (env) => {
         a4a.onLayoutMeasure();
         await a4a.layoutCallback();
         verifyCachedContentIframeRender(a4aElement, TEST_URL, true);
-        expect(a4a.iframe.getAttribute('allow')).to.equal(
-          "sync-xhr 'none';attribution-reporting 'src';"
+        expect(a4a.iframe.getAttribute('allow')).to.include("sync-xhr 'none';");
+        expect(a4a.iframe.getAttribute('allow')).to.include(
+          "attribution-reporting 'src';"
         );
       });
 
@@ -942,7 +943,10 @@ describes.realWin('amp-a4a', {amp: true}, (env) => {
         a4a.onLayoutMeasure();
         await a4a.layoutCallback();
         verifyCachedContentIframeRender(a4aElement, TEST_URL, true);
-        expect(a4a.iframe.getAttribute('allow')).to.equal("sync-xhr 'none';");
+        expect(a4a.iframe.getAttribute('allow')).to.include("sync-xhr 'none';");
+        expect(a4a.iframe.getAttribute('allow')).to.not.include(
+          "attribution-reporting 'src';"
+        );
       });
     });