1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Number/bigint-conversion.js b/js/src/tests/test262/built-ins/Number/bigint-conversion.js
new file mode 100644
index 0000000000..489ff429c1
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Number/bigint-conversion.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: BigInt to Number conversion
+esid: pending
+features: [BigInt, exponentiation]
+---*/
+
+assert.sameValue(Number(0n), 0);
+assert.sameValue(+(new Number(0n)), +(new Number(0)));
+
+assert.sameValue(Number(2n**53n), 9007199254740992);
+assert.sameValue(Number(2n**53n + 1n), 9007199254740992);
+assert.sameValue(Number(2n**53n + 2n), 9007199254740994);
+assert.sameValue(Number(2n**53n + 3n), 9007199254740996);
+assert.sameValue(Number(2n**53n + 4n), 9007199254740996);
+
+assert.sameValue(Number(-(2n**53n)), -9007199254740992);
+assert.sameValue(Number(-(2n**53n + 1n)), -9007199254740992);
+assert.sameValue(Number(-(2n**53n + 2n)), -9007199254740994);
+assert.sameValue(Number(-(2n**53n + 3n)), -9007199254740996);
+assert.sameValue(Number(-(2n**53n + 4n)), -9007199254740996);
+
+reportCompare(0, 0);