diff --git a/harness/typeCoercion.js b/harness/typeCoercion.js
index 7cd6a9de3c..76d366d762 100644
--- a/harness/typeCoercion.js
+++ b/harness/typeCoercion.js
@@ -407,3 +407,19 @@ function testNotCoercibleToBigInt(test) {
   testStringValue("0xg");
   testStringValue("1n");
 }
+
+function testCoercibleToBigIntThisValue(value, test) {
+  test(value);
+  test(Object(value));
+}
+
+function testNotCoercibleToBigIntThisValue(test) {
+  test(undefined);
+  test(null);
+  test(true);
+  test(false);
+  test("");
+  test(Symbol(""));
+  test(0);
+  test({});
+}
diff --git a/test/built-ins/BigInt/prototype/valueOf/length.js b/test/built-ins/BigInt/prototype/valueOf/length.js
new file mode 100644
index 0000000000..bf61b877f0
--- /dev/null
+++ b/test/built-ins/BigInt/prototype/valueOf/length.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-bigint.prototype.valueof
+description: BigInt.prototype.valueOf.length property descriptor
+info: >
+  BigInt.prototype.valueOf ( )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [BigInt]
+---*/
+
+verifyProperty(BigInt.prototype.valueOf, "length", {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
diff --git a/test/built-ins/BigInt/prototype/valueOf/name.js b/test/built-ins/BigInt/prototype/valueOf/name.js
new file mode 100644
index 0000000000..c179e0c145
--- /dev/null
+++ b/test/built-ins/BigInt/prototype/valueOf/name.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-bigint.prototype.valueof
+description: BigInt.prototype.valueOf.name property descriptor
+info: >
+  BigInt.prototype.valueOf ( )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [BigInt]
+---*/
+
+verifyProperty(BigInt.prototype.valueOf, "name", {
+  value: "valueOf",
+  writable: false,
+  enumerable: false,
+  configurable: true
+});
diff --git a/test/built-ins/BigInt/prototype/valueOf/prop-desc.js b/test/built-ins/BigInt/prototype/valueOf/prop-desc.js
new file mode 100644
index 0000000000..324fc8f304
--- /dev/null
+++ b/test/built-ins/BigInt/prototype/valueOf/prop-desc.js
@@ -0,0 +1,19 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-bigint.prototype.valueof
+description: BigInt.prototype.valueOf property descriptor
+info: >
+  BigInt.prototype.valueOf ( )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+features: [BigInt]
+---*/
+
+verifyProperty(BigInt.prototype, "valueOf", {
+  writable: true,
+  enumerable: false,
+  configurable: true
+});
diff --git a/test/built-ins/BigInt/prototype/valueOf/this-value-err.js b/test/built-ins/BigInt/prototype/valueOf/this-value-err.js
new file mode 100644
index 0000000000..b707455e64
--- /dev/null
+++ b/test/built-ins/BigInt/prototype/valueOf/this-value-err.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-bigint.prototype.valueof
+description: BigInt.prototype.valueOf this value coercion
+info: >
+  BigInt.prototype.valueOf ( )
+
+  Return ? thisBigIntValue(this value).
+includes: [typeCoercion.js]
+features: [BigInt, arrow-function, Symbol, Symbol.toPrimitive]
+---*/
+
+testNotCoercibleToBigIntThisValue(
+  (x) => assert.throws(TypeError, () => BigInt.prototype.valueOf.call(x))
+);
diff --git a/test/built-ins/BigInt/prototype/valueOf/this-value.js b/test/built-ins/BigInt/prototype/valueOf/this-value.js
new file mode 100644
index 0000000000..4d383aa9cf
--- /dev/null
+++ b/test/built-ins/BigInt/prototype/valueOf/this-value.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2017 Robin Templeton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-bigint.prototype.valueof
+description: BigInt.prototype.valueOf this value coercion
+info: >
+  BigInt.prototype.valueOf ( )
+
+  Return ? thisBigIntValue(this value). 
+includes: [typeCoercion.js]
+features: [BigInt, arrow-function, Symbol, Symbol.toPrimitive]
+---*/
+
+testCoercibleToBigIntThisValue(
+  0n,
+  (x) => assert.sameValue(0n, BigInt.prototype.valueOf.call(x))
+);