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diff --git a/test/built-ins/TypedArrays/ctors-bigint/object-arg/bigint-tobigint64.js b/test/built-ins/TypedArrays/ctors-bigint/object-arg/bigint-tobigint64.js
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+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-typedarray-object
+description: >
+  Behavior for input array of BigInts
+info: |
+  TypedArray ( object )
+  This description applies only if the TypedArray function is called with at
+  least one argument and the Type of the first argument is Object and that
+  object does not have either a [[TypedArrayName]] or an [[ArrayBufferData]]
+  internal slot.
+  ...
+  8. Repeat, while k < len
+    ...
+    b. Let kValue be ? Get(arrayLike, Pk).
+    c. Perform ? Set(O, Pk, kValue, true).
+  ...
+
+  [[Set]] ( P, V, Receiver)
+  ...
+  2. If Type(P) is String and if SameValue(O, Receiver) is true, then
+    a. Let numericIndex be ! CanonicalNumericIndexString(P).
+    b. If numericIndex is not undefined, then
+      i. Return ? IntegerIndexedElementSet(O, numericIndex, V).
+  ...
+
+  IntegerIndexedElementSet ( O, index, value )
+  ...
+  5. If arrayTypeName is "BigUint64Array" or "BigInt64Array",
+     let numValue be ? ToBigInt(value).
+  ...
+  15. Perform SetValueInBuffer(buffer, indexedPosition, elementType, numValue, true, "Unordered").
+      // NOTE: type will be set to BigInt64 in this test
+  16. Return true.
+
+  SetValueInBuffer ( arrayBuffer, byteIndex, type, value, isTypedArray, order [ , isLittleEndian ] )
+  ...
+  8. Let rawBytes be NumberToRawBytes(type, value, isLittleEndian).
+  ...
+
+  NumberToRawBytes( type, value, isLittleEndian )
+  ...
+  3. Else,
+    a. Let n be the Number value of the Element Size specified in Table
+       [The TypedArray Constructors] for Element Type type.
+    b. Let convOp be the abstract operation named in the Conversion Operation
+       column in Table 9 for Element Type type.
+
+  The TypedArray Constructors
+  Element Type: BigInt64
+  Conversion Operation: ToBigInt64
+
+  ToBigInt64 ( argument )
+  The abstract operation ToBigInt64 converts argument to one of 264 integer
+  values in the range -2^63 through 2^63-1, inclusive.
+  This abstract operation functions as follows:
+    1. Let n be ? ToBigInt(argument).
+    2. Let int64bit be n modulo 2^64.
+    3. If int64bit ≥ 2^63, return int64bit - 2^64; otherwise return int64bit.
+
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+var vals = [
+  18446744073709551618n, // 2n ** 64n + 2n
+  9223372036854775810n, // 2n ** 63n + 2n
+  2n,
+  0n,
+  -2n,
+  -9223372036854775810n, // -(2n ** 63n) - 2n
+  -18446744073709551618n, // -(2n ** 64n) - 2n
+];
+
+var typedArray = new BigInt64Array(vals);
+
+assert.sameValue(typedArray[0], 2n,
+                 "ToBigInt64(2n ** 64n + 2n) => 2n");
+
+assert.sameValue(typedArray[1], -9223372036854775806n, // 2n - 2n ** 63n
+                 "ToBigInt64(2n ** 63n + 2n) => -9223372036854775806n");
+
+assert.sameValue(typedArray[2], 2n,
+                 "ToBigInt64(2n) => 2n");
+
+assert.sameValue(typedArray[3], 0n,
+                 "ToBigInt64(0n) => 0n");
+
+assert.sameValue(typedArray[4], -2n,
+                 "ToBigInt64( -2n) => -2n");
+
+assert.sameValue(typedArray[5], 9223372036854775806n, // 2n ** 63n - 2
+                 "ToBigInt64( -(2n ** 64n) - 2n) => 9223372036854775806n");
+
+assert.sameValue(typedArray[6], -2n,
+                 "ToBigInt64( -(2n ** 64n) - 2n) => -2n");
+