src/third_party/mozjs-45/js/src/jit-test/tests/collections/Set-constructor-1.js

// The Set constructor creates an empty Set by default.

load(libdir + "asserts.js");

var s = new Set();
assertEq(s.size, 0);
s = new Set(undefined);
assertEq(s.size, 0);
s = new Set(null);
assertEq(s.size, 0);

assertThrowsInstanceOf(() => Set(), TypeError);
assertThrowsInstanceOf(() => Set(undefined), TypeError);
assertThrowsInstanceOf(() => Set(null), TypeError);