1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/unary-minus/bigint.js b/js/src/tests/test262/language/expressions/unary-minus/bigint.js
new file mode 100644
index 0000000000..727f6d5ed1
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/unary-minus/bigint.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Unary minus for BigInt values
+esid: sec-numeric-types-bigint-unaryMinus
+info: |
+  BigInt::unaryMinus (x)
+
+  The abstract operation BigInt::unaryMinus with an argument x of BigInt type returns the result of negating x.
+
+  Note: There is only one 0n value; -0n is the same as 0n.
+
+features: [BigInt]
+---*/
+
+assert.sameValue(-0n, 0n, "-0n === 0n");
+assert.sameValue(-(0n), 0n, "-(0n) === 0n");
+assert.notSameValue(-1n, 1n, "-1n !== 1n");
+assert.sameValue(-(1n), -1n, "-(1n) === -1n");
+assert.notSameValue(-(1n), 1n, "-(1n) !== 1n");
+assert.sameValue(-(-1n), 1n, "-(-1n) === 1n");
+assert.notSameValue(-(-1n), -1n, "-(-1n) !== -1n");
+assert.sameValue(- - 1n, 1n, "- - 1n === 1n");
+assert.notSameValue(- - 1n, -1n, "- - 1n !== -1n");
+assert.sameValue(
+  -(0x1fffffffffffff01n), -0x1fffffffffffff01n,
+  "-(0x1fffffffffffff01n) === -0x1fffffffffffff01n");
+assert.notSameValue(
+  -(0x1fffffffffffff01n), 0x1fffffffffffff01n,
+  "-(0x1fffffffffffff01n) !== 0x1fffffffffffff01n");
+assert.notSameValue(
+  -(0x1fffffffffffff01n), -0x1fffffffffffff00n,
+  "-(0x1fffffffffffff01n) !== -0x1fffffffffffff00n");
+
+reportCompare(0, 0);