diff --git a/test/built-ins/Object/assign/ObjectOverride-sameproperty.js b/test/built-ins/Object/assign/ObjectOverride-sameproperty.js
new file mode 100644
index 0000000000000000000000000000000000000000..1527a270491018b72da7ae9048a451ed4130ba88
--- /dev/null
+++ b/test/built-ins/Object/assign/ObjectOverride-sameproperty.js
@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*--
+description: Object properties are assigned to target in ascending index order,
+             i.e. a later assignment to the same property overrides an earlier assignment.
+es6id:  19.1.2.1
+--*/
+
+var target = {a: 1};
+var result = Object.assign(target,{a:2},{a:"c"});
+
+assert.sameValue(result.a, "c", "The value should be 'c'.");
diff --git a/test/built-ins/Object/assign/OnlyOneArgument.js b/test/built-ins/Object/assign/OnlyOneArgument.js
new file mode 100644
index 0000000000000000000000000000000000000000..9131e1146afd26092ca6b1a2e7fc742877df12cb
--- /dev/null
+++ b/test/built-ins/Object/assign/OnlyOneArgument.js
@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: test Object.Assign(target,...sources),only one argument was passed,
+             return ToObject(target)
+es6id:  19.1.2.1.3
+---*/
+
+var target = "a";
+var result = Object.assign(target);
+
+assert.sameValue(result.valueOf(), "a", "The value should be 'a'.");
diff --git a/test/built-ins/Object/assign/Override-notstringtarget.js b/test/built-ins/Object/assign/Override-notstringtarget.js
new file mode 100644
index 0000000000000000000000000000000000000000..49ade3cb54f37c32e26ec64a0a052fb1ebd7455b
--- /dev/null
+++ b/test/built-ins/Object/assign/Override-notstringtarget.js
@@ -0,0 +1,17 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test override of Object.Assign(target,...sources),
+             Every string from sources will be wrapped to objects, and override from the first letter(result[0]) all the time
+es6id:  19.1.2.1
+---*/
+
+var target = 12;
+var result = Object.assign(target,"aaa","bb2b","1c");
+
+assert.sameValue(Object.keys(result).length, 4 , "The length should be 4 in the final object.");
+assert.sameValue(result[0], "1", "The value should be {\"0\":\"1\"}.");
+assert.sameValue(result[1], "c", "The value should be {\"1\":\"c\"}.");
+assert.sameValue(result[2], "2", "The value should be {\"2\":\"2\"}.");
+assert.sameValue(result[3], "b", "The value should be {\"3\":\"b\"}.");
diff --git a/test/built-ins/Object/assign/Override.js b/test/built-ins/Object/assign/Override.js
new file mode 100644
index 0000000000000000000000000000000000000000..0a7d6943852c0faa4772825e839ec1b59436d05f
--- /dev/null
+++ b/test/built-ins/Object/assign/Override.js
@@ -0,0 +1,27 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test Object.Assign(target,...sources).
+es6id:  19.1.2.1.5.c
+---*/
+
+//"a" will be an property of the final object and the value should be 1
+var target = {a:1};
+/*---
+"1a2c3" have own enumerable properties, so it Should be wrapped to objects;
+{b:6} is an object,should be assigned to final object.
+undefined and null should be ignored;
+125 is a number,it cannot has own enumerable properties;
+{a:"c"},{a:5} will override property a, the value should be 5.
+---*/
+var result = Object.assign(target,"1a2c3",{a:"c"},undefined,{b:6},null,125,{a:5});
+
+assert.sameValue(Object.keys(result).length, 7 , "The length should be 7 in the final object.");
+assert.sameValue(result.a, 5, "The value should be {a:5}.");
+assert.sameValue(result[0], "1", "The value should be {\"0\":\"1\"}.");
+assert.sameValue(result[1], "a", "The value should be {\"1\":\"a\"}.");
+assert.sameValue(result[2], "2", "The value should be {\"2\":\"2\"}.");
+assert.sameValue(result[3], "c", "The value should be {\"3\":\"c\"}.");
+assert.sameValue(result[4], "3", "The value should be {\"4\":\"3\"}.");
+assert.sameValue(result.b, 6, "The value should be {b:6}.");
diff --git a/test/built-ins/Object/assign/Source-Null-Undefined.js b/test/built-ins/Object/assign/Source-Null-Undefined.js
new file mode 100644
index 0000000000000000000000000000000000000000..881768a97707caaeab10f994c48e1ccd8f8ba72f
--- /dev/null
+++ b/test/built-ins/Object/assign/Source-Null-Undefined.js
@@ -0,0 +1,12 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: null and undefined source should be ignored,result should be original object.
+es6id:  19.1.2.1.5.a
+---*/
+
+var target = new Object();
+var result = Object.assign(target,undefined,null);
+
+assert.sameValue(result, target, "null and undefined should be ignored, result should be original object.");
diff --git a/test/built-ins/Object/assign/Source-Number-Boolen-Symbol.js b/test/built-ins/Object/assign/Source-Number-Boolen-Symbol.js
new file mode 100644
index 0000000000000000000000000000000000000000..3a00c7d9a5290002e5ee778335b9cb241e6a358d
--- /dev/null
+++ b/test/built-ins/Object/assign/Source-Number-Boolen-Symbol.js
@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*--
+description: Number,Boolean,Symbol cannot have own enumerable properties,
+             So cannot be Assigned.Here result should be original object.
+es6id:  19.1.2.1.5.c
+--*/
+
+var target = new Object();
+var result = Object.assign(target,123,true,Symbol('foo'));
+
+assert.sameValue(result, target, "Numbers, booleans, and symbols cannot have wrappers with own enumerable properties.");
diff --git a/test/built-ins/Object/assign/Source-String.js b/test/built-ins/Object/assign/Source-String.js
new file mode 100644
index 0000000000000000000000000000000000000000..3516cefa2910a09d8a874f5edc4c3828454d4697
--- /dev/null
+++ b/test/built-ins/Object/assign/Source-String.js
@@ -0,0 +1,14 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test Object.Assign(target,...sources), string have own enumerable properties, so it can be wrapped to objects.
+es6id:  19.1.2.1.5.c
+---*/
+
+var target = new Object();
+var result = Object.assign(target,"123");
+
+assert.sameValue(result[0], "1", "The value should be {\"0\":\"1\"}.");
+assert.sameValue(result[1], "2", "The value should be {\"1\":\"2\"}.");
+assert.sameValue(result[2], "3", "The value should be {\"2\":\"3\"}.");
diff --git a/test/built-ins/Object/assign/Target-Boolean.js b/test/built-ins/Object/assign/Target-Boolean.js
new file mode 100644
index 0000000000000000000000000000000000000000..d41c4ba5d03c4839129fcff9ad6a57d832d37253
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-Boolean.js
@@ -0,0 +1,12 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is Boolean,the return value should be a new object whose value is target.
+es6id:  19.1.2.1.1
+---*/
+
+var result = Object.assign(true,{a:1});
+assert.sameValue(typeof result, "object", "Return value should be an object.");
+assert.sameValue(result.valueOf(), true, "Return value should be true.");
diff --git a/test/built-ins/Object/assign/Target-Null.js b/test/built-ins/Object/assign/Target-Null.js
new file mode 100644
index 0000000000000000000000000000000000000000..d5eb7803e31c88492edd2c2efc79587bd60aca66
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-Null.js
@@ -0,0 +1,10 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is null,Should Throw a TypeError exception.
+es6id:  19.1.2.1.1
+---*/
+
+assert.throws(TypeError, function(){Object.assign(null, {a:1});});
diff --git a/test/built-ins/Object/assign/Target-Number.js b/test/built-ins/Object/assign/Target-Number.js
new file mode 100644
index 0000000000000000000000000000000000000000..0971ca3d10b74c6ce21dc2f4ec00b7e190ca9993
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-Number.js
@@ -0,0 +1,12 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is Number,the return value should be a new object whose value is target.
+es6id:  19.1.2.1.1
+---*/
+
+var result = Object.assign(1,{a:1});
+assert.sameValue(typeof result, "object", "Return value should be an object.");
+assert.sameValue(result.valueOf(), 1, "Return value should be 1.");
diff --git a/test/built-ins/Object/assign/Target-Object.js b/test/built-ins/Object/assign/Target-Object.js
new file mode 100644
index 0000000000000000000000000000000000000000..d3ba7da0f8a4ed25d1833135a2d537f0761f3b3a
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-Object.js
@@ -0,0 +1,14 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is Object,its properties will be the properties of new object.
+es6id:  19.1.2.1.1
+---*/
+
+var target = {foo: 1};
+var result = Object.assign(target,{a:2});
+
+assert.sameValue(result.foo, 1, "The value should be {foo: 1}.");
+assert.sameValue(result.a, 2, "The value should be {a: 2}.");
diff --git a/test/built-ins/Object/assign/Target-String.js b/test/built-ins/Object/assign/Target-String.js
new file mode 100644
index 0000000000000000000000000000000000000000..2adecfb31f3440587cfa818c325474212ff1225e
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-String.js
@@ -0,0 +1,12 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is String,the return value should be a new object whose value is target.
+es6id:  19.1.2.1.1
+---*/
+
+var result = Object.assign("test",{a:1});
+assert.sameValue(typeof result, "object", "Return value should be an object.");
+assert.sameValue(result.valueOf(), "test", "Return value should be 'test'.");
diff --git a/test/built-ins/Object/assign/Target-Symbol.js b/test/built-ins/Object/assign/Target-Symbol.js
new file mode 100644
index 0000000000000000000000000000000000000000..ef1335a42570de246ba3fb9a72c53bd23a64f629
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-Symbol.js
@@ -0,0 +1,14 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is Symbol,the return value should be a new Symbol object whose [[SymbolData]] value is target.
+es6id:  19.1.2.1.1
+---*/
+
+var target = Symbol('foo');
+var result = Object.assign(target,{a:1});
+
+assert.sameValue(typeof result, "object", "Return value should be a symbol object.");
+assert.sameValue(result.toString(), "Symbol(foo)", "Return value should be 'Symbol(foo)'.");
diff --git a/test/built-ins/Object/assign/Target-Undefined.js b/test/built-ins/Object/assign/Target-Undefined.js
new file mode 100644
index 0000000000000000000000000000000000000000..9df5bee105b748ea0f3baab3f9bcc8a0faaf8fb7
--- /dev/null
+++ b/test/built-ins/Object/assign/Target-Undefined.js
@@ -0,0 +1,10 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Test the first argument(target) of Object.Assign(target,...sources),
+             if target is Undefined,Should Throw a TypeError exception.
+es6id:  19.1.2.1.1
+---*/
+
+assert.throws(TypeError, function(){Object.assign(undefined, {a:1});});
diff --git a/test/built-ins/Object/assign/assign-descriptor.js b/test/built-ins/Object/assign/assign-descriptor.js
new file mode 100644
index 0000000000000000000000000000000000000000..d0d73ea425e79c123b678111fead0da4ed28282c
--- /dev/null
+++ b/test/built-ins/Object/assign/assign-descriptor.js
@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Testing descriptor property of Object.assign
+includes:
+    - propertyHelper.js
+es6id: 19.1.2.1
+---*/
+
+verifyWritable(Object, "assign");
+verifyNotEnumerable(Object, "assign");
+verifyConfigurable(Object, "assign");
diff --git a/test/built-ins/Object/assign/assign-length.js b/test/built-ins/Object/assign/assign-length.js
new file mode 100644
index 0000000000000000000000000000000000000000..b49b0a7149416adb92a6b1ee76d77a93f11a9bbd
--- /dev/null
+++ b/test/built-ins/Object/assign/assign-length.js
@@ -0,0 +1,9 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: The length property of the assign method should be 2
+es6id:  19.1.2.1
+---*/
+
+assert.sameValue(Object.assign.length, 2, "The length property of the assign method should be 2.");