Merge & refactor bound function "length" property descriptor tests

test/built-ins/Function/prototype/bind/15.3.4.5-13.b-1.js

@@ -1,14 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.3.4.5-13.b-1
-description: Function.prototype.bind, bound fn has a 'length' own property
----*/
-
-function foo() {}
-var o = {};
-
-var bf = foo.bind(o);
-
-assert(bf.hasOwnProperty('length'), 'bf.hasOwnProperty("length") !== true');

test/built-ins/Function/prototype/bind/15.3.4.5-15-1.js

@@ -1,17 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.3.4.5-15-1
-description: Function.prototype.bind, 'length' is a data valued own property
----*/
-
-function foo() {}
-var o = {};
-
-var bf = foo.bind(o);
-var desc = Object.getOwnPropertyDescriptor(bf, 'length');
-
-assert.sameValue(desc.hasOwnProperty('value'), true, 'desc.hasOwnProperty("value")');
-assert.sameValue(desc.hasOwnProperty('get'), false, 'desc.hasOwnProperty("get")');
-assert.sameValue(desc.hasOwnProperty('set'), false, 'desc.hasOwnProperty("set")');

test/built-ins/Function/prototype/bind/15.3.4.5-15-2.js

@@ -1,19 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.3.4.5-15-2
-description: >
-    Function.prototype.bind, 'length' is a data valued own property
----*/
-
-function foo() {}
-var o = {};
-
-var bf = foo.bind(o);
-var desc = Object.getOwnPropertyDescriptor(bf, 'length');
-
-assert.sameValue(desc.value, 0, 'desc.value');
-assert.sameValue(desc.enumerable, false, 'desc.enumerable');
-assert.sameValue(desc.writable, false, 'desc.writable');
-assert.sameValue(desc.configurable, true, 'desc.configurable');

test/built-ins/Function/prototype/bind/15.3.4.5-15-3.js

@@ -1,18 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.3.4.5-15-3
-description: >
-    Function.prototype.bind - The [[Writable]] attribute of length
-    property in F set as false
-includes: [propertyHelper.js]
----*/
-
-function foo() {}
-var obj = foo.bind({});
-var flength = obj.length;
-
-assert(obj.hasOwnProperty("length"));
-verifyNotWritable(obj, "length", null, 100);
-assert.sameValue(obj.length, flength);

test/built-ins/Function/prototype/bind/15.3.4.5-15-4.js

@@ -1,24 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.3.4.5-15-4
-description: >
-    Function.prototype.bind - The [[Enumerable]] attribute of length
-    property in F set as false
----*/
-
-var canEnumerable = false;
-var hasProperty = false;
-
-function foo() {}
-var obj = foo.bind({});
-hasProperty = obj.hasOwnProperty("length");
-for (var prop in obj) {
-  if (prop === "length") {
-    canEnumerable = true;
-  }
-}
-
-assert(hasProperty, 'hasProperty !== true');
-assert.sameValue(canEnumerable, false, 'canEnumerable');

test/built-ins/Function/prototype/bind/15.3.4.5-15-5.js

@@ -1,21 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.3.4.5-15-5
-description: >
-    Function.prototype.bind - The [[Configurable]] attribute of length
-    property in F set as true
----*/
-
-var canConfigurable = false;
-var hasProperty = false;
-
-function foo() {}
-var obj = foo.bind({});
-hasProperty = obj.hasOwnProperty("length");
-delete obj.length;
-canConfigurable = !obj.hasOwnProperty("length");
-
-assert(hasProperty, 'hasProperty !== true');
-assert(canConfigurable, 'canConfigurable !== true');

test/built-ins/Function/prototype/bind/instance-length-prop-desc.js

@@ -0,0 +1,30 @@
+// Copyright (c) 2012 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-function.prototype.bind
+description: >
+  "length" property of a bound function has correct descriptor.
+info: |
+  Function.prototype.bind ( thisArg, ...args )
+
+  [...]
+  8. Perform ! SetFunctionLength(F, L).
+  [...]
+
+  SetFunctionLength ( F, length )
+
+  [...]
+  4. Return ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]:
+  length, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
+includes: [propertyHelper.js]
+---*/
+
+function fn() {}
+
+verifyProperty(fn.bind(null), "length", {
+  value: 0,
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});