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diff --git a/js/src/tests/test262/language/expressions/does-not-equals/bigint-and-number-extremes.js b/js/src/tests/test262/language/expressions/does-not-equals/bigint-and-number-extremes.js
new file mode 100644
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+++ b/js/src/tests/test262/language/expressions/does-not-equals/bigint-and-number-extremes.js
@@ -0,0 +1,53 @@
+// Copyright (C) 2017 Josh Wolfe. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: Non-strict inequality comparison of BigInt and large Number values
+esid: sec-abstract-equality-comparison
+info: |
+  12. If Type(x) is BigInt and Type(y) is Number, or if Type(x) is Number and Type(y) is BigInt,
+    b. If the mathematical value of x is equal to the mathematical value of y, return true, otherwise return false.
+
+features: [BigInt]
+---*/
+assert.sameValue(1n != Number.MAX_VALUE, true, 'The result of (1n != Number.MAX_VALUE) is true');
+assert.sameValue(Number.MAX_VALUE != 1n, true, 'The result of (Number.MAX_VALUE != 1n) is true');
+assert.sameValue(1n != -Number.MAX_VALUE, true, 'The result of (1n != -Number.MAX_VALUE) is true');
+assert.sameValue(-Number.MAX_VALUE != 1n, true, 'The result of (-Number.MAX_VALUE != 1n) is true');
+
+assert.sameValue(
+  0xfffffffffffff7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffn != Number.MAX_VALUE,
+  true,
+  'The result of (0xfffffffffffff7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffn != Number.MAX_VALUE) is true'
+);
+
+assert.sameValue(
+  Number.MAX_VALUE != 0xfffffffffffff7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffn,
+  true,
+  'The result of (Number.MAX_VALUE != 0xfffffffffffff7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffn) is true'
+);
+
+assert.sameValue(
+  0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000n != Number.MAX_VALUE,
+  false,
+  'The result of (0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000n != Number.MAX_VALUE) is false'
+);
+
+assert.sameValue(
+  Number.MAX_VALUE != 0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000n,
+  false,
+  'The result of (Number.MAX_VALUE != 0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000n) is false'
+);
+
+assert.sameValue(
+  0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001n != Number.MAX_VALUE,
+  true,
+  'The result of (0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001n != Number.MAX_VALUE) is true'
+);
+
+assert.sameValue(
+  Number.MAX_VALUE != 0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001n,
+  true,
+  'The result of (Number.MAX_VALUE != 0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001n) is true'
+);
+
+reportCompare(0, 0);