1 files changed, 85 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/string-totitlecase.js b/js/src/jit-test/tests/warp/string-totitlecase.js
new file mode 100644
index 0000000000..0237a263b3
--- /dev/null
+++ b/js/src/jit-test/tests/warp/string-totitlecase.js
@@ -0,0 +1,85 @@
+// Test inline title case conversion.
+
+function* characters(...ranges) {
+  for (let [start, end] of ranges) {
+    for (let i = start; i <= end; ++i) {
+      yield i;
+    }
+  }
+}
+
+const ascii = [...characters(
+  [0x41, 0x5A], // A..Z
+  [0x61, 0x7A], // a..z
+  [0x30, 0x39], // 0..9
+)];
+
+const latin1 = [...characters(
+  [0xC0, 0xFF], // À..ÿ
+)];
+
+const twoByte = [...characters(
+  [0x100, 0x17E], // Ā..ž
+)];
+
+String.prototype.toTitleCase = function() {
+  "use strict";
+
+  var s = String(this);
+
+  if (s.length === 0) {
+    return s;
+  }
+  return s[0].toUpperCase() + s.substring(1);
+};
+
+function toRope(s) {
+  try {
+    return newRope(s[0], s.substring(1));
+  } catch {}
+  // newRope can fail when |s| fits into an inline string. In that case simply
+  // return the input.
+  return s;
+}
+
+for (let i = 0; i <= 32; ++i) {
+  let strings = [ascii, latin1, twoByte].flatMap(codePoints => [
+    String.fromCodePoint(...codePoints.slice(0, i)),
+
+    // Leading ASCII upper case character.
+    "A" + String.fromCodePoint(...codePoints.slice(0, i)),
+
+    // Leading ASCII lower case character.
+    "a" + String.fromCodePoint(...codePoints.slice(0, i)),
+
+    // Leading Latin-1 upper case character.
+    "À" + String.fromCodePoint(...codePoints.slice(0, i)),
+
+    // Leading Latin-1 lower case character.
+    "à" + String.fromCodePoint(...codePoints.slice(0, i)),
+
+    // Leading Two-Byte upper case character.
+    "Ā" + String.fromCodePoint(...codePoints.slice(0, i)),
+
+    // Leading Two-Byte lower case character.
+    "ā" + String.fromCodePoint(...codePoints.slice(0, i)),
+  ]).flatMap(x => [
+    x,
+    toRope(x),
+    newString(x, {twoByte: true}),
+  ]);
+
+  const expected = strings.map(x => {
+    // Prevent Warp compilation when computing the expected results.
+    with ({}) ;
+    return x.toTitleCase();
+  });
+
+  for (let i = 0; i < 1000; ++i) {
+    let idx = i % strings.length;
+    let str = strings[idx];
+
+    let actual = str.toTitleCase();
+    if (actual !== expected[idx]) throw new Error();
+  }
+}