[destructuring] More tests for object literal pattern

test/mjsunit/harmony/destructuring.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Flags: --harmony-destructuring
 
 (function TestObjectLiteralPattern() {
   var { x : x, y : y } = { x : 1, y : 2 };
   assertEquals(1, x);
   assertEquals(2, y);
 
   var {z} = { z : 3 };
   assertEquals(3, z);
 
 
   var sum = 0;
   for(var {z} = { z : 3 }; z != 0; z--) {
     sum += z;
   }
   assertEquals(6, sum);
+
+
+  var countX = 0;
+  var countY = 0;
+  var countZ = 0;
+  var o = { get x() {

[arv (Not doing code reviews), 2015/05/18 13:12:53]

var o = {
  get x() {
    ...
  }
};

[Dmitry Lomov (no reviews), 2015/05/18 13:41:46]

Done.

+              countX++;
+              return 0;
+            },
+            get y() {
+              countY++;
+              return {
+                get z() { countZ++; return 1; }
+              }
+            }
+  };
+  var { x : x0, y : { z : z1 }, x : x1 } = o;

[arv (Not doing code reviews), 2015/05/18 13:12:53]

who would have ever thought :-)

+  assertSame(0, x0);
+  assertSame(1, z1);
+  assertSame(0, x1);
+  assertEquals(2, countX);
+  assertEquals(1, countY);
+  assertEquals(1, countZ);
 }());
 
 
 (function TestObjectLiteralPatternLexical() {
   'use strict';
   let { x : x, y : y } = { x : 1, y : 2 };
   assertEquals(1, x);
   assertEquals(2, y);
 
   let {z} = { z : 3 };
   assertEquals(3, z);
 
+  let countX = 0;
+  let countY = 0;
+  let countZ = 0;
+  let o = { get x() {
+              countX++;
+              return 0;
+            },
+            get y() {
+              countY++;
+              return {
+                get z() { countZ++; return 1; }
+              }
+            }
+  };
+  let { x : x0, y : { z : z1 }, x : x1 } = o;
+  assertSame(0, x0);
+  assertSame(1, z1);
+  assertSame(0, x1);
+  assertEquals(2, countX);
+  assertEquals(1, countY);
+  assertEquals(1, countZ);
+
 
   let sum = 0;
   for(let {x, z} = { x : 0, z : 3 }; z != 0; z--) {
     assertEquals(0, x);
     sum += z;
   }
   assertEquals(6, sum);
 }());
 
 
 (function TestObjectLiteralPatternLexicalConst() {
   'use strict';
   const { x : x, y : y } = { x : 1, y : 2 };
   assertEquals(1, x);
   assertEquals(2, y);
 
+  assertThrows(function() { x++; }, TypeError);
+  assertThrows(function() { y++; }, TypeError);
+
   const {z} = { z : 3 };
   assertEquals(3, z);
 
 
   for(const {x, z} = { x : 0, z : 3 }; z != 3 || x != 0;) {
     assertTrue(false);
   }
 }());
+
+(function TestFailingMatchesSloppy() {
+  var {x, y} = {};
+  assertSame(undefined, x);
+  assertSame(undefined, y);
+
+  var { x : { z1 }, y2} = { x : {}, y2 : 42 }
+  assertSame(undefined, z1);
+  assertSame(42, y2);
+}());
+
+
+(function TestFailingMatchesStrict() {
+  'use strict';
+  var {x, y} = {};
+  assertSame(undefined, x);
+  assertSame(undefined, y);
+
+  var { x : { z1 }, y2} = { x : {}, y2 : 42 }
+  assertSame(undefined, z1);
+  assertSame(42, y2);
+
+  {
+    let {x1,y1} = {};
+    assertSame(undefined, x1);
+    assertSame(undefined, y1);
+
+    let { x : { z1 }, y2} = { x : {}, y2 : 42 }
+    assertSame(undefined, z1);
+    assertSame(42, y2);
+  }
+}());
+
+
+(function TestExceptions() {
+  assertThrows(function() { var {} = null; }, TypeError);

[caitp (gmail), 2015/05/18 13:11:06]

do we want to test the other cases that would cause the
`RequireObjectCoercible(value)` test to throw? Including nested patterns

[Dmitry Lomov (no reviews), 2015/05/18 13:41:46]

Done.

+  assertThrows(function() { 'use strict'; let {} = null; }, TypeError);
+}());