third_party/web_platform_tests/encoding/iso-2022-jp-encoder.html

<!doctype html>
<meta charset=iso-2022-jp> <!-- if the server overrides this, it is stupid, as this is a testsuite -->
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
 function encode(input, output, desc) {
   test(function() {
     var a = document.createElement("a") // <a> uses document encoding for URL's query
     a.href = "https://example.com/?" + input
     assert_equals(a.search.substr(1), output) // remove leading "?"
   }, "iso-2022-jp encoder: " + desc)
 }

 encode("s", "s", "very basic")
 encode("\u00A5\u203Es\\\uFF90\u4F69", "%1B(J\\~s%1B(B\\%1B$B%_PP%1B(B", "basics")
 encode("\x0E\x0F\x1Bx", "%0E%0F%1Bx", "SO/SI ESC")
</script>