Merge pull request #217 from bocoup/rest-params

Import tests from Google V8 (Rest Parameters)

test/language/rest-parameters/arrow-function-invalid.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    Invalid rest parameter in arrow function parameters
+negative: SyntaxError
+---*/
+var x = ...y => y;

test/language/rest-parameters/arrow-function.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >arrow functions
+includes: [compareArray.js]
+---*/
+var fn = (a, b, ...c) => c;
+
+assert(compareArray(fn(), []), "`compareArray(fn(), [])` returns `true`");
+assert(compareArray(fn(1, 2), []), "`compareArray(fn(1, 2), [])` returns `true`");
+assert(compareArray(fn(1, 2, 3), [3]),"`compareArray(fn(1, 2, 3), [3])` returns `true`");
+assert(compareArray(fn(1, 2, 3, 4), [3, 4]),"`compareArray(fn(1, 2, 3, 4), [3, 4])` returns `true`");
+assert(compareArray(fn(1, 2, 3, 4, 5), [3, 4, 5]),"`compareArray(fn(1, 2, 3, 4, 5), [3, 4, 5])` returns `true`");
+assert(compareArray(((...args) => args)(), []),"`compareArray(((...args) => args)(), [])` returns `true`");
+assert(compareArray(((...args) => args)(1,2,3), [1,2,3]),"`compareArray(((...args) => args)(1,2,3), [1,2,3])` returns `true`");

test/language/rest-parameters/expected-argument-count.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1.6
+description: >
+    The ExpectedArgumentCount of a FormalParameterList is the number of
+    FormalParameters to the left of either the rest parameter or the first
+    FormalParameter with an Initializer.
+---*/
+function af(...a) {}
+function bf(a, ...b) {}
+
+assert.sameValue(af.length, 0, "The value of `af.length` is `0`");
+assert.sameValue(bf.length, 1, "The value of `bf.length` is `1`");

test/language/rest-parameters/no-alias-arguments.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    no alias arguments
+includes: [compareArray.js]
+---*/
+function f(a, ...rest) {
+  arguments[0] = 1;
+  assert.sameValue(a, 3, "The value of `a` is `3`");
+  arguments[1] = 2;
+  assert(compareArray(rest, [4, 5]), "`compareArray(rest, [4, 5])` returns `true`");
+}
+f(3, 4, 5);

test/language/rest-parameters/position-invalid.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    Rest parameter cannot be followed by another named parameter
+negative: SyntaxError
+---*/
+function f(a, ...b, c) {}

test/language/rest-parameters/rest-index.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    rest index
+---*/
+assert.sameValue(
+    (function(...args) { return args.length; })(1,2,3,4,5),
+    5,
+    "`(function(...args) { return args.length; })(1,2,3,4,5)` returns `5`"
+);
+assert.sameValue(
+    (function(a, ...args) { return args.length; })(1,2,3,4,5),
+    4,
+    "`(function(a, ...args) { return args.length; })(1,2,3,4,5)` returns `4`"
+);
+assert.sameValue(
+    (function(a, b, ...args) { return args.length; })(1,2,3,4,5),
+    3,
+    "`(function(a, b, ...args) { return args.length; })(1,2,3,4,5)` returns `3`"
+);
+assert.sameValue(
+    (function(a, b, c, ...args) { return args.length; })(1,2,3,4,5),
+    2,
+    "`(function(a, b, c, ...args) { return args.length; })(1,2,3,4,5)` returns `2`"
+);
+assert.sameValue(
+    (function(a, b, c, d, ...args) { return args.length; })(1,2,3,4,5),
+    1,
+    "`(function(a, b, c, d, ...args) { return args.length; })(1,2,3,4,5)` returns `1`"
+);
+assert.sameValue(
+    (function(a, b, c, d, e, ...args) { return args.length; })(1,2,3,4,5),
+    0,
+    "`(function(a, b, c, d, e, ...args) { return args.length; })(1,2,3,4,5)` returns `0`"
+);

test/language/rest-parameters/rest-parameters-apply.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    Rest parameter and Function.prototype.apply
+---*/
+function af(...a) {
+  return a.length;
+}
+
+assert.sameValue(af.apply(null, []), 0, "`af.apply(null, [])` returns `0`");
+assert.sameValue(af.apply(null, [1]), 1, "`af.apply(null, [1])` returns `1`");
+assert.sameValue(af.apply(null, [1, 2]), 2, "`af.apply(null, [1, 2])` returns `2`");
+assert.sameValue(af.apply(null, [1, ,2]), 3, "`af.apply(null, [1, ,2])` returns `3`");

test/language/rest-parameters/rest-parameters-call.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    Rest parameter and Function.prototype.call
+---*/
+function af(...a) {
+  return a.length;
+}
+
+assert.sameValue(af.call(null), 0, "`af.call(null)` returns `0`");
+assert.sameValue(af.call(null, 1), 1, "`af.call(null, 1)` returns `1`");
+assert.sameValue(af.call(null, 1, 2), 2, "`af.call(null, 1, 2)` returns `2`");

test/language/rest-parameters/rest-parameters-produce-an-array.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    Rest parameter produces an instance of Array
+---*/
+function af(...a) {
+  assert.sameValue(a.constructor, Array, "The value of `a.constructor` is `Array`");
+  assert(Array.isArray(a), "`Array.isArray(a)` returns `true`");
+}
+af(1);

test/language/rest-parameters/with-new-target.js

+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.1
+description: >
+    with new target
+includes: [compareArray.js]
+---*/
+class Base {
+  constructor(...a) {
+    assert.sameValue(
+      arguments.length,
+      a.length,
+      "The value of `arguments.length` is `a.length`"
+    );
+    this.base = a;
+    var args = [];
+    for (var i = 0; i < arguments.length; ++i) {
+      args.push(arguments[i]);
+    }
+    assert(compareArray(args, a), "`compareArray(args, a)` returns `true`");
+  }
+}
+class Child extends Base {
+  constructor(...b) {
+    super(1, 2, 3);
+    assert.sameValue(
+      arguments.length,
+      b.length,
+      "The value of `arguments.length` is `b.length`"
+    );
+    this.child = b;
+    var args = [];
+    for (var i = 0; i < arguments.length; ++i) {
+      args.push(arguments[i]);
+    }
+    assert(compareArray(args, b), "`compareArray(args, b)` returns `true`");
+  }
+}
+
+var c = new Child(1, 2, 3);
+
+assert.sameValue(c.child.length, 3, "The value of `c.child.length` is `3`");
+assert.sameValue(c.base.length, 3, "The value of `c.base.length` is `3`");
+
+assert(
+  compareArray(c.child, [1, 2, 3]),
+  "`compareArray(c.child, [1, 2, 3])` returns `true`"
+);
+assert(
+  compareArray(c.base, [1, 2, 3]),
+  "`compareArray(c.base, [1, 2, 3])` returns `true`"
+);