third_party/web_platform_tests/encoding/textencoder-constructor-non-utf.html

<!DOCTYPE html>
<title>Encoding API: Legacy encodings</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/encodings.js"></script>
<script>

encodings_table.forEach(function(section) {
    section.encodings.filter(function(encoding) {
        return encoding.name !== 'replacement';
    }).forEach(function(encoding) {
        if (utf_encodings.indexOf(encoding.name) !== -1) {
            test(function() {
                assert_equals(new TextDecoder(encoding.name).encoding, encoding.name);
                assert_equals(new TextEncoder(encoding.name).encoding, encoding.name);
            }, 'UTF encodings are supported for encode and decode: ' + encoding.name);
        } else {
            test(function() {
                assert_equals(new TextDecoder(encoding.name).encoding, encoding.name);
                assert_throws(new RangeError(), function() { new TextEncoder(encoding.name); });
            }, 'Non-UTF encodings supported only for decode, not encode: ' + encoding.name);
        }
    });
});

</script>