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.
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JSTests
/
es6
/
Promise_is_subclassable_correct_prototype_chain.js
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function
test
()
{
class
C extends
Promise
{}
var
c
=
new
C
(
function
(
resolve
,
reject
)
{
resolve
(
"foo"
);
});
return
c instanceof C
&&
c instanceof
Promise
&&
Object
.
getPrototypeOf
(
C
)
===
Promise
;
}
if
(!
test
())
throw
new
Error
(
"Test failed"
);