v8/test/mjsunit/value-of.js

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let valueOf = Object.prototype.valueOf;

assertEquals('object', typeof valueOf.call(true));
assertEquals('object', typeof valueOf.call(false));
assertEquals('object', typeof valueOf.call(1.23));
assertEquals('object', typeof valueOf.call(0));
assertEquals('object', typeof valueOf.call('a'));
assertEquals('object', typeof valueOf.call(Symbol.isConcatSpreadable));
assertThrows(() => valueOf.call(undefined), TypeError);
assertThrows(() => valueOf.call(null), TypeError);

function MyException() { }
var o = new Object();
o.valueOf = function() { throw new MyException(); }

assertThrows(function() { o + 1 }, MyException);