1 files changed, 120 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testIndexToString.cpp b/js/src/jsapi-tests/testIndexToString.cpp
new file mode 100644
index 0000000000..9074a4267c
--- /dev/null
+++ b/js/src/jsapi-tests/testIndexToString.cpp
@@ -0,0 +1,120 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jsnum.h"
+
+#include "jsapi-tests/tests.h"
+#include "vm/JSContext.h"
+#include "vm/Realm.h"
+#include "vm/StaticStrings.h"
+
+#include "vm/StringType-inl.h"
+
+static const struct TestPair {
+  uint32_t num;
+  const char* expected;
+} tests[] = {
+    {0, "0"},
+    {1, "1"},
+    {2, "2"},
+    {9, "9"},
+    {10, "10"},
+    {15, "15"},
+    {16, "16"},
+    {17, "17"},
+    {99, "99"},
+    {100, "100"},
+    {255, "255"},
+    {256, "256"},
+    {257, "257"},
+    {999, "999"},
+    {1000, "1000"},
+    {4095, "4095"},
+    {4096, "4096"},
+    {9999, "9999"},
+    {1073741823, "1073741823"},
+    {1073741824, "1073741824"},
+    {1073741825, "1073741825"},
+    {2147483647, "2147483647"},
+    {2147483648u, "2147483648"},
+    {2147483649u, "2147483649"},
+    {4294967294u, "4294967294"},
+};
+
+BEGIN_TEST(testIndexToString) {
+  for (const auto& test : tests) {
+    uint32_t u = test.num;
+    JSString* str = js::IndexToString(cx, u);
+    CHECK(str);
+
+    if (!js::StaticStrings::hasUint(u)) {
+      CHECK(cx->realm()->dtoaCache.lookup(10, u) == str);
+    }
+
+    bool match = false;
+    CHECK(JS_StringEqualsAscii(cx, str, test.expected, &match));
+    CHECK(match);
+  }
+
+  return true;
+}
+END_TEST(testIndexToString)
+
+BEGIN_TEST(testStringIsIndex) {
+  for (const auto& test : tests) {
+    uint32_t u = test.num;
+    JSLinearString* str = js::IndexToString(cx, u);
+    CHECK(str);
+
+    uint32_t n;
+    CHECK(str->isIndex(&n));
+    CHECK(u == n);
+  }
+
+  return true;
+}
+END_TEST(testStringIsIndex)
+
+BEGIN_TEST(testStringToPropertyName) {
+  uint32_t index;
+
+  static const char16_t hiChars[] = {'h', 'i'};
+  JSLinearString* hiStr = NewString(cx, hiChars);
+  CHECK(hiStr);
+  CHECK(!hiStr->isIndex(&index));
+  CHECK(hiStr->toPropertyName(cx) != nullptr);
+
+  static const char16_t maxChars[] = {'4', '2', '9', '4', '9',
+                                      '6', '7', '2', '9', '4'};
+  JSLinearString* maxStr = NewString(cx, maxChars);
+  CHECK(maxStr);
+  CHECK(maxStr->isIndex(&index));
+  CHECK(index == UINT32_MAX - 1);
+
+  static const char16_t maxPlusOneChars[] = {'4', '2', '9', '4', '9',
+                                             '6', '7', '2', '9', '5'};
+  JSLinearString* maxPlusOneStr = NewString(cx, maxPlusOneChars);
+  CHECK(maxPlusOneStr);
+  CHECK(!maxPlusOneStr->isIndex(&index));
+  CHECK(maxPlusOneStr->toPropertyName(cx) != nullptr);
+
+  static const char16_t maxNonUint32Chars[] = {'4', '2', '9', '4', '9',
+                                               '6', '7', '2', '9', '6'};
+  JSLinearString* maxNonUint32Str = NewString(cx, maxNonUint32Chars);
+  CHECK(maxNonUint32Str);
+  CHECK(!maxNonUint32Str->isIndex(&index));
+  CHECK(maxNonUint32Str->toPropertyName(cx) != nullptr);
+
+  return true;
+}
+
+template <size_t N>
+static JSLinearString* NewString(JSContext* cx, const char16_t (&chars)[N]) {
+  return js::NewStringCopyN<js::CanGC>(cx, chars, N);
+}
+
+END_TEST(testStringToPropertyName)