1 files changed, 150 insertions, 0 deletions
diff --git a/js/src/tests/non262/Intl/NumberFormat/formatRange-BigInt.js b/js/src/tests/non262/Intl/NumberFormat/formatRange-BigInt.js
new file mode 100644
index 0000000000..36ccdf59e3
--- /dev/null
+++ b/js/src/tests/non262/Intl/NumberFormat/formatRange-BigInt.js
@@ -0,0 +1,150 @@
+// |reftest| skip-if(!this.hasOwnProperty("Intl")||release_or_beta)
+
+// Int64-BigInts which can be exactly represented as doubles receive a fast-path.
+
+const tests = {
+  "en": {
+    options: {},
+    ranges: [
+      // BigInt around Number.MIN_SAFE_INTEGER.
+      {
+        start: -0x20000000000001n,
+        end: -0x20000000000000n,
+        result: "-9,007,199,254,740,993 – -9,007,199,254,740,992",
+      },
+      {
+        start: -0x20000000000000n,
+        end: -0x20000000000000n,
+        result: "~-9,007,199,254,740,992",
+      },
+      {
+        start: -0x20000000000000n,
+        end: -0x1fffffffffffffn,
+        result: "-9,007,199,254,740,992 – -9,007,199,254,740,991",
+      },
+      {
+        start: -0x1fffffffffffffn,
+        end: -0x1fffffffffffffn,
+        result: "~-9,007,199,254,740,991",
+      },
+      {
+        start: -0x1fffffffffffffn,
+        end: -0x1ffffffffffffen,
+        result: "-9,007,199,254,740,991 – -9,007,199,254,740,990",
+      },
+      {
+        start: -0x1ffffffffffffen,
+        end: -0x1ffffffffffffen,
+        result: "~-9,007,199,254,740,990",
+      },
+
+      // BigInt around Number.MAX_SAFE_INTEGER.
+      {
+        start: 0x1ffffffffffffen,
+        end: 0x1ffffffffffffen,
+        result: "~9,007,199,254,740,990",
+      },
+      {
+        start: 0x1ffffffffffffen,
+        end: 0x1fffffffffffffn,
+        result: "9,007,199,254,740,990–9,007,199,254,740,991",
+      },
+      {
+        start: 0x1fffffffffffffn,
+        end: 0x1fffffffffffffn,
+        result: "~9,007,199,254,740,991",
+      },
+      {
+        start: 0x1fffffffffffffn,
+        end: 0x20000000000000n,
+        result: "9,007,199,254,740,991–9,007,199,254,740,992",
+      },
+      {
+        start: 0x20000000000000n,
+        end: 0x20000000000000n,
+        result: "~9,007,199,254,740,992",
+      },
+      {
+        start: 0x20000000000000n,
+        end: 0x20000000000001n,
+        result: "9,007,199,254,740,992–9,007,199,254,740,993",
+      },
+
+      // BigInt around INT64_MIN.
+      {
+        start: -0x8000000000000002n,
+        end: -0x8000000000000001n,
+        result: "-9,223,372,036,854,775,810 – -9,223,372,036,854,775,809",
+      },
+      {
+        start: -0x8000000000000001n,
+        end: -0x8000000000000001n,
+        result: "~-9,223,372,036,854,775,809",
+      },
+      {
+        start: -0x8000000000000001n,
+        end: -0x8000000000000000n,
+        result: "-9,223,372,036,854,775,809 – -9,223,372,036,854,775,808",
+      },
+      {
+        start: -0x8000000000000000n,
+        end: -0x8000000000000000n,
+        result: "~-9,223,372,036,854,775,808",
+      },
+      {
+        start: -0x8000000000000000n,
+        end: -0x7fffffffffffffffn,
+        result: "-9,223,372,036,854,775,808 – -9,223,372,036,854,775,807",
+      },
+      {
+        start: -0x7fffffffffffffffn,
+        end: -0x7fffffffffffffffn,
+        result: "~-9,223,372,036,854,775,807",
+      },
+
+      // BigInt around INT64_MAX.
+      {
+        start: 0x7ffffffffffffffen,
+        end: 0x7ffffffffffffffen,
+        result: "~9,223,372,036,854,775,806",
+      },
+      {
+        start: 0x7ffffffffffffffen,
+        end: 0x7fffffffffffffffn,
+        result: "9,223,372,036,854,775,806–9,223,372,036,854,775,807",
+      },
+      {
+        start: 0x7fffffffffffffffn,
+        end: 0x7fffffffffffffffn,
+        result: "~9,223,372,036,854,775,807",
+      },
+      {
+        start: 0x7fffffffffffffffn,
+        end: 0x8000000000000000n,
+        result: "9,223,372,036,854,775,807–9,223,372,036,854,775,808",
+      },
+      {
+        start: 0x8000000000000000n,
+        end: 0x8000000000000000n,
+        result: "~9,223,372,036,854,775,808",
+      },
+      {
+        start: 0x8000000000000000n,
+        end: 0x8000000000000001n,
+        result: "9,223,372,036,854,775,808–9,223,372,036,854,775,809",
+      },
+    ],
+  },
+};
+
+for (let [locale, {options, ranges}] of Object.entries(tests)) {
+  let nf = new Intl.NumberFormat(locale, options);
+  for (let {start, end, result} of ranges) {
+    assertEq(nf.formatRange(start, end), result, `${start}-${end}`);
+    assertEq(nf.formatRangeToParts(start, end).reduce((acc, part) => acc + part.value, ""),
+             result, `${start}-${end}`);
+  }
+}
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);