Merge & improve remaining arguments tests

test/built-ins/Function/prototype/bind/15.3.4.5-13.b-2.js

@@ -1,16 +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-2
-description: >
-    Function.prototype.bind, 'length' set to remaining number of
-    expected args
----*/
-
-function foo(x, y) {}
-var o = {};
-
-var bf = foo.bind(o);
-
-assert.sameValue(bf.length, 2, 'bf.length');

test/built-ins/Function/prototype/bind/15.3.4.5-13.b-3.js

@@ -1,16 +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-3
-description: >
-    Function.prototype.bind, 'length' set to remaining number of
-    expected args (all args prefilled)
----*/
-
-function foo(x, y) {}
-var o = {};
-
-var bf = foo.bind(o, 42, 101);
-
-assert.sameValue(bf.length, 0, 'bf.length');

test/built-ins/Function/prototype/bind/15.3.4.5-13.b-4.js

@@ -1,16 +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-4
-description: >
-    Function.prototype.bind, 'length' set to remaining number of
-    expected args (target takes 0 args)
----*/
-
-function foo() {}
-var o = {};
-
-var bf = foo.bind(o);
-
-assert.sameValue(bf.length, 0, 'bf.length');

test/built-ins/Function/prototype/bind/15.3.4.5-13.b-5.js

@@ -1,16 +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-5
-description: >
-    Function.prototype.bind, 'length' set to remaining number of
-    expected args (target provided extra args)
----*/
-
-function foo() {}
-var o = {};
-
-var bf = foo.bind(o, 42);
-
-assert.sameValue(bf.length, 0, 'bf.length');

test/built-ins/Function/prototype/bind/15.3.4.5-13.b-6.js

@@ -1,16 +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-6
-description: >
-    Function.prototype.bind, 'length' set to remaining number of
-    expected args
----*/
-
-function foo(x, y) {}
-var o = {};
-
-var bf = foo.bind(o, 42);
-
-assert.sameValue(bf.length, 1, 'bf.length');

test/built-ins/Function/prototype/bind/instance-length-remaining-args.js

@@ -0,0 +1,35 @@
+// 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" value of a bound function is set to remaining number
+  of arguments expected by target function. Extra arguments are ignored.
+info: |
+  Function.prototype.bind ( thisArg, ...args )
+
+  [...]
+  5. Let targetHasLength be ? HasOwnProperty(Target, "length").
+  6. If targetHasLength is true, then
+    a. Let targetLen be ? Get(Target, "length").
+    b. If Type(targetLen) is not Number, let L be 0.
+    c. Else,
+      i. Set targetLen to ! ToInteger(targetLen).
+      ii. Let L be the larger of 0 and the result of targetLen minus the number of elements of args.
+  7. Else, let L be 0.
+  8. Perform ! SetFunctionLength(F, L).
+  [...]
+---*/
+
+function foo() {}
+
+assert.sameValue(foo.bind(null).length, 0, '0/0');
+assert.sameValue(foo.bind(null, 1).length, 0, '1/0');
+
+function bar(x, y) {}
+
+assert.sameValue(bar.bind(null).length, 2, '0/2');
+assert.sameValue(bar.bind(null, 1).length, 1, '1/2');
+assert.sameValue(bar.bind(null, 1, 2).length, 0, '2/2');
+assert.sameValue(bar.bind(null, 1, 2, 3).length, 0, '3/2');