diff --git a/test/harness/assert-false.js b/test/harness/assert-false.js
new file mode 100644
index 0000000000..93b8205813
--- /dev/null
+++ b/test/harness/assert-false.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    `false` does not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert(false);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-notsamevalue-nan.js b/test/harness/assert-notsamevalue-nan.js
new file mode 100644
index 0000000000..856cc482c7
--- /dev/null
+++ b/test/harness/assert-notsamevalue-nan.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Two references to NaN do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.notSameValue(NaN, NaN);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-notsamevalue-notsame.js b/test/harness/assert-notsamevalue-notsame.js
new file mode 100644
index 0000000000..ae222b15d6
--- /dev/null
+++ b/test/harness/assert-notsamevalue-notsame.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Values that are not strictly equal satisfy the assertion.
+---*/
+
+assert.notSameValue(undefined, null);
+assert.notSameValue(null, undefined);
+assert.notSameValue(0, 1);
+assert.notSameValue(1, 0);
+assert.notSameValue('', 's');
+assert.notSameValue('s', '');
diff --git a/test/harness/assert-notsamevalue-objects.js b/test/harness/assert-notsamevalue-objects.js
new file mode 100644
index 0000000000..1e4fb54a99
--- /dev/null
+++ b/test/harness/assert-notsamevalue-objects.js
@@ -0,0 +1,9 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Distinct objects satisfy the assertion.
+---*/
+
+assert.notSameValue({}, {});
diff --git a/test/harness/assert-notsamevalue-zeros.js b/test/harness/assert-notsamevalue-zeros.js
new file mode 100644
index 0000000000..9a2d105429
--- /dev/null
+++ b/test/harness/assert-notsamevalue-zeros.js
@@ -0,0 +1,9 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Positive and negative zero satisfy the assertion.
+---*/
+
+assert.notSameValue(0, -0);
diff --git a/test/harness/assert-obj.js b/test/harness/assert-obj.js
new file mode 100644
index 0000000000..edaf82fc69
--- /dev/null
+++ b/test/harness/assert-obj.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    An object literal does not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert({});
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-samevalue-nan.js b/test/harness/assert-samevalue-nan.js
new file mode 100644
index 0000000000..8ca9e56e6e
--- /dev/null
+++ b/test/harness/assert-samevalue-nan.js
@@ -0,0 +1,9 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Two references to NaN satisfy the assertion.
+---*/
+
+assert.sameValue(NaN, NaN);
diff --git a/test/harness/assert-samevalue-objects.js b/test/harness/assert-samevalue-objects.js
new file mode 100644
index 0000000000..833f864b4d
--- /dev/null
+++ b/test/harness/assert-samevalue-objects.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Distinct objects do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.sameValue({}, {});
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-samevalue-same.js b/test/harness/assert-samevalue-same.js
new file mode 100644
index 0000000000..0e38a9cef7
--- /dev/null
+++ b/test/harness/assert-samevalue-same.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Values that are strictly equal satisfy the assertion.
+---*/
+var obj;
+
+assert.sameValue(undefined, undefined);
+assert.sameValue(null, null);
+assert.sameValue(0, 0);
+assert.sameValue(1, 1);
+assert.sameValue('', '');
+assert.sameValue('s', 's');
+
+obj = {};
+assert.sameValue(obj, obj);
diff --git a/test/harness/assert-samevalue-zeros.js b/test/harness/assert-samevalue-zeros.js
new file mode 100644
index 0000000000..a4a44a031d
--- /dev/null
+++ b/test/harness/assert-samevalue-zeros.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Positive and negative zero do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.sameValue(0, -0);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-throws-custom.js b/test/harness/assert-throws-custom.js
new file mode 100644
index 0000000000..4d42b130c3
--- /dev/null
+++ b/test/harness/assert-throws-custom.js
@@ -0,0 +1,14 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions that throw instances of the specified constructor function
+    satisfy the assertion.
+---*/
+
+function MyError() {}
+
+assert.throws(MyError, function() {
+  throw new MyError();
+});
diff --git a/test/harness/assert-throws-incorrect-ctor.js b/test/harness/assert-throws-incorrect-ctor.js
new file mode 100644
index 0000000000..47f4f0ba76
--- /dev/null
+++ b/test/harness/assert-throws-incorrect-ctor.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions that throw values whose constructor does not match the specified
+    constructor do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.throws(Error, function() {
+    throw new TypeError();
+  });
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-throws-native.js b/test/harness/assert-throws-native.js
new file mode 100644
index 0000000000..7650acb19e
--- /dev/null
+++ b/test/harness/assert-throws-native.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions that throw instances of the specified native Error constructor
+    satisfy the assertion.
+---*/
+
+assert.throws(Error, function() {
+  throw new Error();
+});
+
+assert.throws(EvalError, function() {
+  throw new EvalError();
+});
+
+assert.throws(RangeError, function() {
+  throw new RangeError();
+});
+
+assert.throws(ReferenceError, function() {
+  throw new ReferenceError();
+});
+
+assert.throws(SyntaxError, function() {
+  throw new SyntaxError();
+});
+
+assert.throws(TypeError, function() {
+  throw new TypeError();
+});
+
+assert.throws(URIError, function() {
+  throw new URIError();
+});
diff --git a/test/harness/assert-throws-no-arg.js b/test/harness/assert-throws-no-arg.js
new file mode 100644
index 0000000000..c8a9f3510b
--- /dev/null
+++ b/test/harness/assert-throws-no-arg.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    The assertion fails when invoked without arguments.
+---*/
+
+var threw = false;
+
+try {
+  assert.throws();
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-throws-no-error.js b/test/harness/assert-throws-no-error.js
new file mode 100644
index 0000000000..d40b06b44c
--- /dev/null
+++ b/test/harness/assert-throws-no-error.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions that do not throw errors do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.throws(Error, function() {});
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-throws-null.js b/test/harness/assert-throws-null.js
new file mode 100644
index 0000000000..7b10f61247
--- /dev/null
+++ b/test/harness/assert-throws-null.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions that throw the `null` value do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.throws(Error, function() {
+    throw null;
+  });
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-throws-primitive.js b/test/harness/assert-throws-primitive.js
new file mode 100644
index 0000000000..f1f86e18e0
--- /dev/null
+++ b/test/harness/assert-throws-primitive.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions that throw primitive values do not satisfy the assertion.
+---*/
+
+var threw = false;
+
+try {
+  assert.throws(Error, function() {
+    throw 3;
+  });
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-throws-single-arg.js b/test/harness/assert-throws-single-arg.js
new file mode 100644
index 0000000000..3606a1608d
--- /dev/null
+++ b/test/harness/assert-throws-single-arg.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    The assertion fails when invoked with a single argument.
+---*/
+
+var threw = false;
+
+try {
+  assert.throws(function() {});
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/assert-true.js b/test/harness/assert-true.js
new file mode 100644
index 0000000000..7050005a9c
--- /dev/null
+++ b/test/harness/assert-true.js
@@ -0,0 +1,9 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    `true` satisfies the assertion.
+---*/
+
+assert(true);
diff --git a/test/harness/compare-array-different-elements.js b/test/harness/compare-array-different-elements.js
new file mode 100644
index 0000000000..32ed51c819
--- /dev/null
+++ b/test/harness/compare-array-different-elements.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Arrays containing different elements are not equivalent.
+includes: [compareArray.js]
+---*/
+
+var first = [0, 'a', undefined];
+var second = [0, 'b', undefined];
+
+if (compareArray(first, second) !== false) {
+  $ERROR('Arrays containing different elements are not equivalent.');
+}
diff --git a/test/harness/compare-array-different-length.js b/test/harness/compare-array-different-length.js
new file mode 100644
index 0000000000..df48a86638
--- /dev/null
+++ b/test/harness/compare-array-different-length.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Arrays of differing lengths are not equivalent.
+includes: [compareArray.js]
+---*/
+
+if (compareArray([], [undefined]) !== false) {
+  $ERROR('Arrays of differing lengths are not equivalent.');
+}
+
+if (compareArray([undefined], []) !== false) {
+  $ERROR('Arrays of differing lengths are not equivalent.');
+}
diff --git a/test/harness/compare-array-empty.js b/test/harness/compare-array-empty.js
new file mode 100644
index 0000000000..f3196db4c4
--- /dev/null
+++ b/test/harness/compare-array-empty.js
@@ -0,0 +1,12 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Empty arrays of are equivalent.
+includes: [compareArray.js]
+---*/
+
+if (compareArray([], []) !== true) {
+  $ERROR('Empty arrays are equivalent.');
+}
diff --git a/test/harness/compare-array-same-elements-different-order.js b/test/harness/compare-array-same-elements-different-order.js
new file mode 100644
index 0000000000..243d670bae
--- /dev/null
+++ b/test/harness/compare-array-same-elements-different-order.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Arrays containg the same elements in different order are not equivalent.
+includes: [compareArray.js]
+---*/
+
+var obj = {};
+var first = [0, 1, '', 's', null, undefined, obj];
+var second = [0, 1, '', 's', undefined, null, obj];
+
+if (compareArray(first, second) !== false) {
+  $ERROR('Arrays containing the same elements in different order are not equivalent.');
+}
diff --git a/test/harness/compare-array-same-elements-same-order.js b/test/harness/compare-array-same-elements-same-order.js
new file mode 100644
index 0000000000..ac09fed284
--- /dev/null
+++ b/test/harness/compare-array-same-elements-same-order.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Arrays containg the same elements in the same order are equivalent.
+includes: [compareArray.js]
+---*/
+
+var obj = {};
+var first = [0, 1, '', 's', undefined, null, obj];
+var second = [0, 1, '', 's', undefined, null, obj];
+
+if (compareArray(first, second) !== true) {
+  $ERROR('Arrays containing the same elements in the same order are equivalent.');
+}
diff --git a/test/harness/compare-array-sparse.js b/test/harness/compare-array-sparse.js
new file mode 100644
index 0000000000..316039a06f
--- /dev/null
+++ b/test/harness/compare-array-sparse.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Spares arrays are only equivalent if they have the same length.
+includes: [compareArray.js]
+---*/
+
+if (compareArray([,], [,]) !== true) {
+  $ERROR('Sparse arrays of the same length are equivalent.');
+}
+
+if (compareArray([,], [,,]) !== false) {
+  $ERROR('Sparse arrays of differing lengths are not equivalent.');
+}
+
+if (compareArray([,,], [,]) !== false) {
+  $ERROR('Sparse arrays of differing lengths are not equivalent.');
+}
+
+if (compareArray([,], []) !== false) {
+  $ERROR('Sparse arrays are not equivalent to empty arrays.');
+}
+
+if (compareArray([], [,]) !== false) {
+  $ERROR('Sparse arrays are not equivalent to empty arrays.');
+}
diff --git a/test/harness/error.js b/test/harness/error.js
new file mode 100644
index 0000000000..e6cee574f6
--- /dev/null
+++ b/test/harness/error.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    The global `$ERROR` function throws an instance of the global `Test262`
+    function with the specified message.
+---*/
+
+var threw = false;
+
+try {
+  $ERROR('This is a test message');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    throw new Error(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+  if (err.message !== 'This is a test message') {
+    throw new Error('The error thrown did not define the specified message.');
+  }
+}
+
+if (threw === false) {
+  throw new Error('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifyconfigurable-configurable.js b/test/harness/propertyhelper-verifyconfigurable-configurable.js
new file mode 100644
index 0000000000..997c9f9390
--- /dev/null
+++ b/test/harness/propertyhelper-verifyconfigurable-configurable.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is configurable satisfy the assertion.
+includes: [propertyHelper.js]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: true
+});
+
+verifyConfigurable(obj, 'a');
diff --git a/test/harness/propertyhelper-verifyconfigurable-not-configurable-not-strict.js b/test/harness/propertyhelper-verifyconfigurable-not-configurable-not-strict.js
new file mode 100644
index 0000000000..e8216b2329
--- /dev/null
+++ b/test/harness/propertyhelper-verifyconfigurable-not-configurable-not-strict.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not configurable do not satisfy the
+    assertion outside of strict mode.
+includes: [propertyHelper.js]
+flags: [noStrict]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: false
+});
+
+try {
+  verifyConfigurable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifyconfigurable-not-configurable-strict.js b/test/harness/propertyhelper-verifyconfigurable-not-configurable-strict.js
new file mode 100644
index 0000000000..ce438f50fa
--- /dev/null
+++ b/test/harness/propertyhelper-verifyconfigurable-not-configurable-strict.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not configurable do not satisfy the
+    assertion in strict mode.
+includes: [propertyHelper.js]
+flags: [onlyStrict]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: false
+});
+
+try {
+  verifyConfigurable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifyenumerable-enumerable.js b/test/harness/propertyhelper-verifyenumerable-enumerable.js
new file mode 100644
index 0000000000..7540999802
--- /dev/null
+++ b/test/harness/propertyhelper-verifyenumerable-enumerable.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is enumerable satisfy the assertion.
+includes: [propertyHelper.js]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  enumerable: true
+});
+
+verifyEnumerable(obj, 'a');
diff --git a/test/harness/propertyhelper-verifyenumerable-not-enumerable.js b/test/harness/propertyhelper-verifyenumerable-not-enumerable.js
new file mode 100644
index 0000000000..569ac0904a
--- /dev/null
+++ b/test/harness/propertyhelper-verifyenumerable-not-enumerable.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not enumerable do not satisfy the
+    assertion.
+includes: [propertyHelper.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  enumerable: false
+});
+
+try {
+  verifyEnumerable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifynotconfigurable-configurable.js b/test/harness/propertyhelper-verifynotconfigurable-configurable.js
new file mode 100644
index 0000000000..4b66a9b12a
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotconfigurable-configurable.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is configurable do not satisfy the
+    assertion.
+includes: [propertyHelper.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: true
+});
+
+try {
+  verifyNotConfigurable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifynotconfigurable-not-configurable-not-strict.js b/test/harness/propertyhelper-verifynotconfigurable-not-configurable-not-strict.js
new file mode 100644
index 0000000000..e8b882427a
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotconfigurable-not-configurable-not-strict.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not configurable satisfy the assertion
+    outside of strict mode.
+includes: [propertyHelper.js]
+flags: [noStrict]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: false
+});
+
+verifyNotConfigurable(obj, 'a');
diff --git a/test/harness/propertyhelper-verifynotconfigurable-not-configurable-strict.js b/test/harness/propertyhelper-verifynotconfigurable-not-configurable-strict.js
new file mode 100644
index 0000000000..b551076365
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotconfigurable-not-configurable-strict.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not configurable satisfy the assertion
+    in strict mode.
+includes: [propertyHelper.js]
+flags: [onlyStrict]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  configurable: false
+});
+
+verifyNotConfigurable(obj, 'a');
diff --git a/test/harness/propertyhelper-verifynotenumerable-enumerable.js b/test/harness/propertyhelper-verifynotenumerable-enumerable.js
new file mode 100644
index 0000000000..1d838d4f6c
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotenumerable-enumerable.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is enumerable do not satisfy the
+    assertion.
+includes: [propertyHelper.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  enumerable: true
+});
+
+try {
+  verifyNotEnumerable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js b/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js
new file mode 100644
index 0000000000..6e04b69309
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js
@@ -0,0 +1,15 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not enumerable satisfy the assertion.
+includes: [propertyHelper.js]
+---*/
+
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  enumerable: false
+});
+
+verifyNotEnumerable(obj, 'a');
diff --git a/test/harness/propertyhelper-verifynotwritable-not-writable-not-strict.js b/test/harness/propertyhelper-verifynotwritable-not-writable-not-strict.js
new file mode 100644
index 0000000000..7b2963ceb2
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotwritable-not-writable-not-strict.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not writable satisfy the assertion
+    outside of strict mode.
+includes: [propertyHelper.js]
+flags: [noStrict]
+---*/
+
+var obj = {};
+
+Object.defineProperty(obj, 'a', {
+  writable: false,
+  value: 123
+});
+
+verifyNotWritable(obj, 'a');
+
+if (obj.a !== 123) {
+  $ERROR('`verifyNotWritable` should be non-destructive.');
+}
diff --git a/test/harness/propertyhelper-verifynotwritable-not-writable-strict.js b/test/harness/propertyhelper-verifynotwritable-not-writable-strict.js
new file mode 100644
index 0000000000..f30533116f
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotwritable-not-writable-strict.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not writable satisfy the assertion in
+    strict mode.
+includes: [propertyHelper.js]
+flags: [onlyStrict]
+---*/
+
+var obj = {};
+
+Object.defineProperty(obj, 'a', {
+  writable: false,
+  value: 123
+});
+
+verifyNotWritable(obj, 'a');
+
+if (obj.a !== 123) {
+  $ERROR('`verifyNotWritable` should be non-destructive.');
+}
diff --git a/test/harness/propertyhelper-verifynotwritable-writable.js b/test/harness/propertyhelper-verifynotwritable-writable.js
new file mode 100644
index 0000000000..8eb1b75fb7
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotwritable-writable.js
@@ -0,0 +1,31 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is writable do not satisfy the assertion.
+includes: [propertyHelper.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: true,
+  value: 1
+});
+
+try {
+  verifyNotWritable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifywritable-not-writable-not-strict.js b/test/harness/propertyhelper-verifywritable-not-writable-not-strict.js
new file mode 100644
index 0000000000..bae8fec16d
--- /dev/null
+++ b/test/harness/propertyhelper-verifywritable-not-writable-not-strict.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not writable do not satisfy the
+    assertion outside of strict mode.
+includes: [propertyHelper.js]
+flags: [noStrict]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: false
+});
+
+try {
+  verifyWritable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifywritable-not-writable-strict.js b/test/harness/propertyhelper-verifywritable-not-writable-strict.js
new file mode 100644
index 0000000000..1ee497f782
--- /dev/null
+++ b/test/harness/propertyhelper-verifywritable-not-writable-strict.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is not writable do not satisfy the
+    assertion in strict mode.
+includes: [propertyHelper.js]
+flags: [onlyStrict]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: false
+});
+
+try {
+  verifyWritable(obj, 'a');
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/propertyhelper-verifywritable-writable.js b/test/harness/propertyhelper-verifywritable-writable.js
new file mode 100644
index 0000000000..5dc13e8c04
--- /dev/null
+++ b/test/harness/propertyhelper-verifywritable-writable.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified property is writable satisfy the assertion.
+includes: [propertyHelper.js]
+---*/
+
+var obj = {};
+
+Object.defineProperty(obj, 'a', {
+  writable: true,
+  value: 123
+});
+
+verifyWritable(obj, 'a');
+
+if (obj.a !== 123) {
+  $ERROR('`verifyWritable` should be non-destructive.');
+}
diff --git a/test/harness/testbuiltinobject-function-badstring.js b/test/harness/testbuiltinobject-function-badstring.js
new file mode 100644
index 0000000000..5b7a4cba6c
--- /dev/null
+++ b/test/harness/testbuiltinobject-function-badstring.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that are expected to be functions but do not define the correct
+    [[Class]] internal property do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+
+try {
+  testBuiltInObject(null, true);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-function-expected-length.js b/test/harness/testbuiltinobject-function-expected-length.js
new file mode 100644
index 0000000000..cc69d94ddf
--- /dev/null
+++ b/test/harness/testbuiltinobject-function-expected-length.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Functions whose `length` property does not match the expected value do not
+    satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+
+try {
+  testBuiltInObject(function(a, b) {}, true, false, [], 3);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-function-not-constructor-no-error.js b/test/harness/testbuiltinobject-function-not-constructor-no-error.js
new file mode 100644
index 0000000000..e3b9f73e34
--- /dev/null
+++ b/test/harness/testbuiltinobject-function-not-constructor-no-error.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Non-constructor functions that do not throw an when invoked via `new` do
+    not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+
+try {
+  testBuiltInObject(function() {}, true, false, [], 0);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-function-not-constructor-no-typeerror.js b/test/harness/testbuiltinobject-function-not-constructor-no-typeerror.js
new file mode 100644
index 0000000000..4a72bf34f2
--- /dev/null
+++ b/test/harness/testbuiltinobject-function-not-constructor-no-typeerror.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Non-constructor functions that do not throw a TypeError when invoked via
+    `new` do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+var fn = function() {
+  throw new Error();
+};
+
+try {
+  testBuiltInObject(fn, true, false, [], 0);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-non-extensible.js b/test/harness/testbuiltinobject-non-extensible.js
new file mode 100644
index 0000000000..5d43f711d6
--- /dev/null
+++ b/test/harness/testbuiltinobject-non-extensible.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that are not extensible  do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.preventExtensions(obj);
+
+try {
+  testBuiltInObject(obj);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-not-function-badstring.js b/test/harness/testbuiltinobject-not-function-badstring.js
new file mode 100644
index 0000000000..9d0e69c95e
--- /dev/null
+++ b/test/harness/testbuiltinobject-not-function-badstring.js
@@ -0,0 +1,27 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that are not expected to be functions but do not define the correct
+    [[Class]] internal property do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+
+try {
+  testBuiltInObject(function() {}, false);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-prop-enumerable.js b/test/harness/testbuiltinobject-prop-enumerable.js
new file mode 100644
index 0000000000..fda5a1abd1
--- /dev/null
+++ b/test/harness/testbuiltinobject-prop-enumerable.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that do not define all of the specified "own" properties as
+    non-enumerable do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: true, enumerable: false, configurable: true
+});
+Object.defineProperty(obj, 'b', {
+  writable: true, enumerable: true, configurable: true
+});
+Object.defineProperty(obj, 'c', {
+  writable: true, enumerable: false, configurable: true
+});
+
+try {
+  testBuiltInObject(obj, false, false, ['a', 'b', 'c']);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-prop-missing.js b/test/harness/testbuiltinobject-prop-missing.js
new file mode 100644
index 0000000000..bfad8336e5
--- /dev/null
+++ b/test/harness/testbuiltinobject-prop-missing.js
@@ -0,0 +1,34 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that do not define all of the specified "own" properties do not
+    satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: true, enumerable: false, configurable: true
+});
+Object.defineProperty(obj, 'c', {
+  writable: true, enumerable: false, configurable: true
+});
+
+try {
+  testBuiltInObject(obj, false, false, ['a', 'b', 'c']);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-prop-not-configurable.js b/test/harness/testbuiltinobject-prop-not-configurable.js
new file mode 100644
index 0000000000..661e344675
--- /dev/null
+++ b/test/harness/testbuiltinobject-prop-not-configurable.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that do not define all of the specified "own" properties as
+    configurable do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: true, enumerable: false, configurable: true
+});
+Object.defineProperty(obj, 'b', {
+  writable: true, enumerable: false, configurable: false
+});
+Object.defineProperty(obj, 'c', {
+  writable: true, enumerable: false, configurable: true
+});
+
+try {
+  testBuiltInObject(obj, false, false, ['a', 'b', 'c']);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-prop-not-writable.js b/test/harness/testbuiltinobject-prop-not-writable.js
new file mode 100644
index 0000000000..7f2ba95daa
--- /dev/null
+++ b/test/harness/testbuiltinobject-prop-not-writable.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects that do not define all of the specified "own" properties as
+    writable do not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+var obj = {};
+Object.defineProperty(obj, 'a', {
+  writable: true, enumerable: false, configurable: true
+});
+Object.defineProperty(obj, 'b', {
+  writable: false, enumerable: false, configurable: true
+});
+Object.defineProperty(obj, 'c', {
+  writable: true, enumerable: false, configurable: true
+});
+
+try {
+  testBuiltInObject(obj, false, false, ['a', 'b', 'c']);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}
diff --git a/test/harness/testbuiltinobject-undefined.js b/test/harness/testbuiltinobject-undefined.js
new file mode 100644
index 0000000000..ffab8c7ed1
--- /dev/null
+++ b/test/harness/testbuiltinobject-undefined.js
@@ -0,0 +1,26 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    `undefined` does not satisfy the assertion.
+includes: [testBuiltInObject.js]
+---*/
+
+var threw = false;
+
+try {
+  testBuiltInObject(undefined);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    $ERROR(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  $ERROR('Expected a Test262Error, but no error was thrown.');
+}