Update Babel plugin tests (#20053)

tests/format/js/function-sent/function-sent.js

@@ -0,0 +1,11 @@
+function *adder(total=0) {
+   let increment=1;
+   do {
+       switch (request = function.sent){
+          case undefined: break;
+          case "done": return total;
+          default: increment = Number(request);
+       }
+       yield total += increment;
+   } while (true)
+}