diff --git a/test/language/expressions/unary-minus/bigint-non-primitive.js b/test/language/expressions/unary-minus/bigint-non-primitive.js
new file mode 100644
index 00000000000..02587c5d56e
--- /dev/null
+++ b/test/language/expressions/unary-minus/bigint-non-primitive.js
@@ -0,0 +1,33 @@
+// 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 object wrappers
+esid: sec-unary-minus-operator-runtime-semantics-evaluation
+info: |
+  Runtime Semantics: Evaluation
+  UnaryExpression : - UnaryExpression
+
+  1. Let expr be the result of evaluating UnaryExpression.
+  2. Let oldValue be ? ToNumeric(? GetValue(expr)).
+  3. Let T be Type(oldValue).
+  4. Return ? T::unaryMinus(oldValue).
+
+features: [BigInt, Symbol.toPrimitive]
+---*/
+
+assert.sameValue(-Object(1n), -1n, "-Object(1n) === -1n");
+assert.notSameValue(-Object(1n), 1n, "-Object(1n) !== 1n");
+assert.notSameValue(-Object(1n), Object(-1n), "-Object(1n) !== Object(-1n)");
+assert.sameValue(-Object(-1n), 1n, "-Object(-1n) === 1n");
+assert.notSameValue(-Object(-1n), -1n, "-Object(-1n) !== -1n");
+assert.notSameValue(-Object(-1n), Object(1n), "-Object(-1n) !== Object(1n)");
+assert.sameValue(
+  -{[Symbol.toPrimitive]: function() { return 1n; }, valueOf: function() { $ERROR(); }, toString: function() { $ERROR(); }}, -1n,
+  "-{[Symbol.toPrimitive]: function() { return 1n; }, valueOf: function() { $ERROR(); }, toString: function() { $ERROR(); }} === -1n");
+assert.sameValue(
+  -{valueOf: function() { return 1n; }, toString: function() { $ERROR(); }}, -1n,
+  "-{valueOf: function() { return 1n; }, toString: function() { $ERROR(); }} === -1n");
+assert.sameValue(
+  -{toString: function() { return 1n; }}, -1n,
+  "-{toString: function() { return 1n; }} === -1n");
diff --git a/test/language/expressions/unary-minus/bigint.js b/test/language/expressions/unary-minus/bigint.js
new file mode 100644
index 00000000000..10b1d166141
--- /dev/null
+++ b/test/language/expressions/unary-minus/bigint.js
@@ -0,0 +1,34 @@
+// 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");