1 files changed, 55 insertions, 0 deletions
diff --git a/testing/web-platform/tests/encoding/legacy-mb-tchinese/big5/big5-enc-ascii.html b/testing/web-platform/tests/encoding/legacy-mb-tchinese/big5/big5-enc-ascii.html
new file mode 100644
index 0000000000..91959206b3
--- /dev/null
+++ b/testing/web-platform/tests/encoding/legacy-mb-tchinese/big5/big5-enc-ascii.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset=big5> <!-- test breaks if the server overrides this -->
+<title>Big5 encoding ASCII</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel='author' title='Richard Ishida' href='mailto:ishida@w3.org'>
+<link rel='help' href='https://encoding.spec.whatwg.org/#big5'>
+<meta name="assert" content="The browser produces the characters when encoding ASCII in a Big5-encoded document.">
+</head>
+<body>
+<div id=log></div>
+<script>
+// index is Big5 index pointer, value is Unicode codepoint (dec)
+
+function encode(input, output, desc) {
+  // tests whether a Unicode character is converted to an equivalent Big5 %-encoded byte sequence by href
+  // input: a escaped Unicode code point from the list of characters in the Big5 index
+  // output: expected percent-encoded byte sequence for the code point's equivalent in Big5 encoding
+  // desc: what's being tested
+  test(function() {
+    var a = document.createElement("a"); // <a> uses document encoding for URL's query
+    // Append and prepend x to test for off-by-one errors
+    a.href = "https://example.com/?x" + input + "x";
+    assert_true(
+      a.search.substr(1) == "x" + output + "x" ||
+        a.search.substr(1) == "x" + input + "x"
+    ); // remove leading "?"
+  }, "big5 encoder: " + desc);
+}
+
+// test ASCII - test separately for chars that aren't escaped
+for (var a = 0; a < 0x7f; a++) {
+  // The first 3 are stripped from URLs and the last is # which introduces a new URL segment
+  if (a === 0x09 || a === 0x0a || a === 0x0d || a === 0x23) {
+    continue;
+  }
+  hex = a.toString(16).toUpperCase();
+  while (hex.length < 2) {
+    hex = "0" + hex;
+  }
+  encode(
+    String.fromCharCode(a),
+    "%" + hex,
+    "test for ASCII codepoint 0x" +
+      a.toString(16) +
+      " " +
+      String.fromCharCode(a)
+  );
+}
+</script>
+</body>
+</html>