Setting Symbol.species should change the return value of constructor
According the spec, if Symbol.species is set, the return value of constructor should be the value of Symbol.species. It seems rhino doesn't do this.
Test case:
var emptyFunc=function() {};
var p = Promise.resolve(1);
p.constructor = {};
var pt1=p.then(emptyFunc);
console.log('pt1='+pt1);
var t = function(e) {
e(emptyFunc, emptyFunc);
};
p.constructor[Symbol.species] = t;
var pt2=p.then(emptyFunc);
console.log('pt2='+pt2);
console.log(pt2 instanceof t);In htmlunit the output is:
pt1=[object Promise]
pt2=[object Promise]
false
In real browser such as chrome, the output is:
pt1=[object Promise]
pt2=[object Object]
true
HtmlUnit / htmlunit
HtmlUnit is a "GUI-Less browser for Java programs".
871
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