src/third_party/mozjs-45/js/src/jit-test/tests/generators/wrappers.js

// Generator methods work transparently on CrossCompartmentWrappers.

load(libdir + "asserts.js");
load(libdir + "iteration.js");

function gen() { yield 1; yield 2; }
var it = gen();

var g = newGlobal();
g.eval("function gen2() { yield 3; yield 4; }; var it2 = gen2();");

// LegacyGenerator.next
assertEq(it.next.call(g.it2), 3);

// LegacyGenerator.throw
assertThrowsValue(() => it.throw.call(g.it2, 7), 7);

function *gen3() { yield 1; yield 2; }
it = gen3();
g.eval("function *gen4() { yield 5; yield 6; }; var it4 = gen4();");

// StarGenerator.next
assertIteratorResult(it.next.call(g.it4), 5, false)

// StarGenerator.throw
assertThrowsValue(() => it.throw.call(g.it4, 8), 8);

// StarGenerator.return
assertIteratorResult(it.return.call(g.it4, 8), 8, true);

// Other objects should throw.
try {
    it.next.call([]);
    assertEq(0, 1);
} catch (e) {
    assertEq(e.toString().includes("called on incompatible Array"), true);
}