(Computed Property Names) Re-organize, add assertion messages.

test/language/computed-property-names/basics/number.js

@@ -17,8 +17,11 @@ var object = {
   c: 'C',
   [ID(2)]: 'D',
 };
-assert.sameValue(object.a, 'A');
-assert.sameValue(object[1], 'B');
-assert.sameValue(object.c, 'C');
-assert.sameValue(object[2], 'D');
-assert(compareArray(Object.keys(object), ['1', '2', 'a', 'c']));
+assert.sameValue(object.a, 'A', "The value of `object.a` is `'A'`. Defined in `object` as `a: 'A'`");
+assert.sameValue(object[1], 'B', "The value of `object[1]` is `'B'`. Defined in `object` as `[1]: 'B'`");
+assert.sameValue(object.c, 'C', "The value of `object.c` is `'C'`. Defined in `object` as `c: 'C'`");
+assert.sameValue(object[2], 'D', "The value of `object[2]` is `'D'`. Defined in `object` as `[ID(2)]: 'D'`");
+assert(
+  compareArray(Object.keys(object), ['1', '2', 'a', 'c']),
+  "`compareArray(Object.keys(object), ['1', '2', 'a', 'c'])` returns `true`"
+);

test/language/computed-property-names/basics/string.js

@@ -16,8 +16,11 @@ var object = {
   c: 'C',
   [ID('d')]: 'D',
 };
-assert.sameValue(object.a, 'A');
-assert.sameValue(object.b, 'B');
-assert.sameValue(object.c, 'C');
-assert.sameValue(object.d, 'D');
-assert(compareArray(Object.keys(object), ['a', 'b', 'c', 'd']));
+assert.sameValue(object.a, 'A', "The value of `object.a` is `'A'`. Defined in `object` as `a: 'A'`");
+assert.sameValue(object.b, 'B', "The value of `object.b` is `'B'`. Defined in `object` as `['b']: 'B'`");
+assert.sameValue(object.c, 'C', "The value of `object.c` is `'C'`. Defined in `object` as `c: 'C'`");
+assert.sameValue(object.d, 'D', "The value of `object.d` is `'D'`. Defined in `object` as `[ID('d')]: 'D'`");
+assert(
+  compareArray(Object.keys(object), ['a', 'b', 'c', 'd']),
+  "`compareArray(Object.keys(object), ['a', 'b', 'c', 'd'])` returns `true`"
+);

test/language/computed-property-names/basics/symbol.js

@@ -19,11 +19,14 @@ var object = {
   c: 'C',
   [ID(sym2)]: 'D',
 };
-assert.sameValue(object.a, 'A');
-assert.sameValue(object[sym1], 'B');
-assert.sameValue(object.c, 'C');
-assert.sameValue(object[sym2], 'D');
-assert(compareArray(Object.keys(object), ['a', 'c']));
+assert.sameValue(object.a, 'A', "The value of `object.a` is `'A'`. Defined in `object` as `a: 'A'`");
+assert.sameValue(object[sym1], 'B', "The value of `object[sym1]` is `'B'`. Defined in `object` as `[sym1]: 'B'`");
+assert.sameValue(object.c, 'C', "The value of `object.c` is `'C'`. Defined in `object` as `c: 'C'`");
+assert.sameValue(object[sym2], 'D', "The value of `object[sym2]` is `'D'`. Defined in `object` as `[ID(sym2)]: 'D'`");
+assert(
+  compareArray(Object.keys(object), ['a', 'c']),
+  "`compareArray(Object.keys(object), ['a', 'c'])` returns `true`"
+);
 
 // compareArray expects arguments to be sorted,
 // which will cause an array containing symbols to
@@ -36,6 +39,12 @@ assert(compareArray(Object.keys(object), ['a', 'c']));
 //
 var symbols = Object.getOwnPropertySymbols(object);
 
-assert(symbols.indexOf(sym1) !== -1);
-assert(symbols.indexOf(sym2) !== -1);
-assert.sameValue(symbols.length, 2);
+assert(
+  symbols.indexOf(sym1) !== -1,
+  "The result of `symbols.indexOf(sym1) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(object);`"
+);
+assert(
+  symbols.indexOf(sym2) !== -1,
+  "The result of `symbols.indexOf(sym2) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(object);`"
+);
+assert.sameValue(symbols.length, 2, "The value of `symbols.length` is `2`, after executing `var symbols = Object.getOwnPropertySymbols(object);`");

test/language/computed-property-names/class/accessor/getter-duplicates.js

@@ -11,37 +11,37 @@ class C {
     return 'A';
   }
 }
-assert.sameValue(new C().a, 'A');
+assert.sameValue(new C().a, 'A', "The value of `new C().a` is `'A'`");
 
 class C2 {
   get b() {
-    assert(false);
+    $ERROR("The first `b` getter definition in `C2` is unreachable");
   }
   get ['b']() {
     return 'B';
   }
 }
-assert.sameValue(new C2().b, 'B');
+assert.sameValue(new C2().b, 'B', "The value of `new C2().b` is `'B'`");
 
 class C3 {
   get c() {
-    assert(false);
+    $ERROR("The first `c` getter definition in `C3` is unreachable");
   }
   get ['c']() {
-    assert(false);
+    $ERROR("The second `c` getter definition in `C3` is unreachable");
   }
   get ['c']() {
     return 'C';
   }
 }
-assert.sameValue(new C3().c, 'C');
+assert.sameValue(new C3().c, 'C', "The value of `new C3().c` is `'C'`");
 
 class C4 {
   get ['d']() {
-    assert(false);
+    $ERROR("The first `d` getter definition in `C4` is unreachable");
   }
   get d() {
     return 'D';
   }
 }
-assert.sameValue(new C4().d, 'D');
+assert.sameValue(new C4().d, 'D', "The value of `new C4().d` is `'D'`");

test/language/computed-property-names/class/accessor/getter.js

@@ -10,4 +10,4 @@ class C {
     return 'A';
   }
 }
-assert.sameValue(new C().a, 'A');
+assert.sameValue(new C().a, 'A', "The value of `new C().a` is `'A'`");

test/language/computed-property-names/class/accessor/setter-duplicates.js

@@ -13,43 +13,43 @@ class C {
   }
 }
 new C().a = 'A';
-assert.sameValue(calls, 1);
+assert.sameValue(calls, 1, "The value of `calls` is `1`, after executing `new C().a = 'A';`");
 
 calls = 0;
 class C2 {
   set b(_) {
-    assert(false);
+    $ERROR("The first `b` setter definition in `C2` is unreachable");
   }
   set ['b'](_) {
     calls++;
   }
 }
 new C2().b = 'B';
-assert.sameValue(calls, 1);
+assert.sameValue(calls, 1, "The value of `calls` is `1`, after executing `new C2().b = 'B';`");
 
 calls = 0;
 class C3 {
   set c(_) {
-    assert(false)
+    $ERROR("The first `c` setter definition in `C3` is unreachable");
   }
   set ['c'](_) {
-    assert(false)
+    $ERROR("The second `c` setter definition in `C3` is unreachable");
   }
   set ['c'](_) {
     calls++
   }
 }
 new C3().c = 'C';
-assert.sameValue(calls, 1);
+assert.sameValue(calls, 1, "The value of `calls` is `1`, after executing `new C3().c = 'C';`");
 
 calls = 0;
 class C4 {
   set ['d'](_) {
-    assert(false)
+    $ERROR("The first `d` setter definition in `C4` is unreachable");
   }
   set d(_) {
     calls++
   }
 }
 new C4().d = 'D';
-assert.sameValue(calls, 1);
+assert.sameValue(calls, 1, "The value of `calls` is `1`, after executing `new C4().d = 'D';`");

test/language/computed-property-names/class/accessor/setter.js

@@ -12,4 +12,4 @@ class C {
   }
 }
 new C().a = 'A';
-assert.sameValue(calls, 1);
+assert.sameValue(calls, 1, "The value of `calls` is `1`, after executing `new C().a = 'A';`");

test/language/computed-property-names/class/method/constructor-cannot-be-generator.js

@@ -0,0 +1,12 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.5.3
+description: >
+    computed property generator method names cannot be "constructor"
+negative: SyntaxError
+---*/
+class C4 {
+  *['constructor']() {
+  }
+}

test/language/computed-property-names/class/method/constructor-cannot-be-getter.js

@@ -0,0 +1,11 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.5.3
+description: >
+    computed property getter names cannot be "constructor"
+negative: SyntaxError
+---*/
+class C4 {
+  get ['constructor']() {}
+}

test/language/computed-property-names/class/method/constructor-cannot-be-setter.js

@@ -0,0 +1,11 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.5.3
+description: >
+    computed property setter names cannot be "constructor"
+negative: SyntaxError
+---*/
+class C4 {
+  set ['constructor'](_) {}
+}

test/language/computed-property-names/class/method/constructor-no-duplicate-1.js

@@ -0,0 +1,12 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 12.2.5
+description: >
+    computed property names can be "constructor", but duplicates are not allowed, 1
+negative: SyntaxError
+---*/
+class C {
+  constructor() {}
+  ['constructor']() {}
+}

test/language/computed-property-names/class/method/constructor-no-duplicate-2.js

@@ -0,0 +1,12 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 12.2.5
+description: >
+    computed property names can be "constructor", but duplicates are not allowed, 2
+negative: SyntaxError
+---*/
+class C {
+  ['constructor']() {}
+  constructor() {}
+}

test/language/computed-property-names/class/method/constructor-no-duplicate-3.js

@@ -0,0 +1,12 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 12.2.5
+description: >
+    computed property names can be "constructor", but duplicates are not allowed, 2
+negative: SyntaxError
+---*/
+class C {
+  ['constructor']() {}
+  ['constructor']() {}
+}

test/language/computed-property-names/class/method/constructor.js

@@ -10,32 +10,8 @@ class C {
     return 1;
   }
 }
-assert(C !== C.prototype.constructor);
-assert.sameValue(new C().constructor(), 1);
-
-class C2 {
-  get ['constructor']() {
-    return 2;
-  }
-}
-assert.sameValue(new C2().constructor, 2);
-
-var calls = 0;
-class C3 {
-  set ['constructor'](x) {
-    assert.sameValue(x, 3);
-    calls++;
-  }
-}
-new C3().constructor = 3;
-assert.sameValue(calls, 1);
-
-class C4 {
-  *['constructor']() {
-    yield 1;
-    yield 2;
-  }
-}
-
-assert(C4 !== C4.prototype.constructor);
-assert.sameValue(new C().constructor(), 1);
+assert(
+  C !== C.prototype.constructor,
+  "The result of `C !== C.prototype.constructor` is `true`"
+);
+assert.sameValue(new C().constructor(), 1, "`new C().constructor()` returns `1`");

test/language/computed-property-names/class/method/generator.js

@@ -12,5 +12,12 @@ class C {
     yield 2;
   }
 }
-assert.sameValue(Object.keys(C.prototype).length, 0);
-assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a']));
+assert.sameValue(
+  Object.keys(C.prototype).length,
+  0,
+  "The value of `Object.keys(C.prototype).length` is `0`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a']),
+  "`compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a'])` returns `true`"
+);

test/language/computed-property-names/class/method/number.js

@@ -17,9 +17,15 @@ class C {
   c() { return 'C'; }
   [ID(2)]() { return 'D'; }
 }
-assert.sameValue(new C().a(), 'A');
-assert.sameValue(new C()[1](), 'B');
-assert.sameValue(new C().c(), 'C');
-assert.sameValue(new C()[2](), 'D');
-assert(compareArray(Object.keys(C.prototype), []));
-assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['1', '2', 'constructor', 'a', 'c']));
+assert.sameValue(new C().a(), 'A', "`new C().a()` returns `'A'`, from `a() { return 'A'; }`");
+assert.sameValue(new C()[1](), 'B', "`new C()[1]()` returns `'B'`, from `[1]() { return 'B'; }`");
+assert.sameValue(new C().c(), 'C', "`new C().c()` returns `'C'`, from `c() { return 'C'; }`");
+assert.sameValue(new C()[2](), 'D', "`new C()[2]()` returns `'D'`, from `[ID(2)]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C.prototype), []),
+  "`compareArray(Object.keys(C.prototype), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C.prototype), ['1', '2', 'constructor', 'a', 'c']),
+  "`compareArray(Object.getOwnPropertyNames(C.prototype), ['1', '2', 'constructor', 'a', 'c'])` returns `true`"
+);

test/language/computed-property-names/class/method/string.js

@@ -17,9 +17,15 @@ class C {
   c() { return 'C'; }
   [ID('d')]() { return 'D'; }
 }
-assert.sameValue(new C().a(), 'A');
-assert.sameValue(new C().b(), 'B');
-assert.sameValue(new C().c(), 'C');
-assert.sameValue(new C().d(), 'D');
-assert(compareArray(Object.keys(C.prototype), []));
-assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'b', 'c', 'd']));
+assert.sameValue(new C().a(), 'A', "`new C().a()` returns `'A'`. Defined as `a() { return 'A'}`");
+assert.sameValue(new C().b(), 'B', "`new C().b()` returns `'B'`. Defined as `['b']() { return 'B'; }`");
+assert.sameValue(new C().c(), 'C', "`new C().c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(new C().d(), 'D', "`new C().d()` returns `'D'`. Defined as `[ID('d')]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C.prototype), []),
+  "`compareArray(Object.keys(C.prototype), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'b', 'c', 'd']),
+  "`compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'b', 'c', 'd'])` returns `true`"
+);

test/language/computed-property-names/class/method/symbol.js

@@ -19,12 +19,18 @@ class C {
   c() { return 'C'; }
   [ID(sym2)]() { return 'D'; }
 }
-assert.sameValue(new C().a(), 'A');
-assert.sameValue(new C()[sym1](), 'B');
-assert.sameValue(new C().c(), 'C');
-assert.sameValue(new C()[sym2](), 'D');
-assert(compareArray(Object.keys(C.prototype), []));
-assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'c']));
+assert.sameValue(new C().a(), 'A', "`new C().a()` returns `'A'`. Defined as `a() { return 'A'; }`");
+assert.sameValue(new C()[sym1](), 'B', "`new C()[sym1]()` returns `'B'`. Defined as `[sym1]() { return 'B'; }`");
+assert.sameValue(new C().c(), 'C', "`new C().c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(new C()[sym2](), 'D', "`new C()[sym2]()` returns `'D'`. Defined as `[ID(sym2)]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C.prototype), []),
+  "`compareArray(Object.keys(C.prototype), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'c']),
+  "`compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'c'])` returns `true`"
+);
 
 // compareArray expects arguments to be sorted,
 // which will cause an array containing symbols to
@@ -37,6 +43,12 @@ assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a'
 //
 var symbols = Object.getOwnPropertySymbols(C.prototype);
 
-assert(symbols.indexOf(sym1) !== -1);
-assert(symbols.indexOf(sym2) !== -1);
-assert.sameValue(symbols.length, 2);
+assert(
+  symbols.indexOf(sym1) !== -1,
+  "The result of `symbols.indexOf(sym1) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(C.prototype);`"
+);
+assert(
+  symbols.indexOf(sym2) !== -1,
+  "The result of `symbols.indexOf(sym2) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(C.prototype);`"
+);
+assert.sameValue(symbols.length, 2, "The value of `symbols.length` is `2`, after executing `var symbols = Object.getOwnPropertySymbols(C.prototype);`");

test/language/computed-property-names/class/static/method-number.js

@@ -12,9 +12,15 @@ class C {
   static c() { return 'C'; }
   static [2]() { return 'D'; }
 }
-assert.sameValue(C.a(), 'A');
-assert.sameValue(C[1](), 'B');
-assert.sameValue(C.c(), 'C');
-assert.sameValue(C[2](), 'D');
-assert(compareArray(Object.keys(C), []));
-assert(compareArray(Object.getOwnPropertyNames(C), ['1', '2', 'length', 'name', 'prototype', 'a', 'c']));
+assert.sameValue(C.a(), 'A', "`C.a()` returns `'A'`. Defined as `static a() { return 'A'; }`");
+assert.sameValue(C[1](), 'B', "`C[1]()` returns `'B'`. Defined as `static [1]() { return 'B'; }`");
+assert.sameValue(C.c(), 'C', "`C.c()` returns `'C'`. Defined as `static c() { return 'C'; }`");
+assert.sameValue(C[2](), 'D', "`C[2]()` returns `'D'`. Defined as `static [2]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C), []),
+  "`compareArray(Object.keys(C), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C), ['1', '2', 'length', 'name', 'prototype', 'a', 'c']),
+  "`compareArray(Object.getOwnPropertyNames(C), ['1', '2', 'length', 'name', 'prototype', 'a', 'c'])` returns `true`"
+);

test/language/computed-property-names/class/static/method-string.js

@@ -12,9 +12,15 @@ class C {
   static c() { return 'C'; }
   static ['d']() { return 'D'; }
 }
-assert.sameValue(C.a(), 'A');
-assert.sameValue(C.b(), 'B');
-assert.sameValue(C.c(), 'C');
-assert.sameValue(C.d(), 'D');
-assert(compareArray(Object.keys(C), []));
-assert(compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'b', 'c', 'd']));
+assert.sameValue(C.a(), 'A', "`C.a()` returns `'A'`. Defined as `static a() { return 'A'}`");
+assert.sameValue(C.b(), 'B', "`C.b()` returns `'B'`. Defined as `static ['b']() { return 'B'; }`");
+assert.sameValue(C.c(), 'C', "`C.c()` returns `'C'`. Defined as `static c() { return 'C'; }`");
+assert.sameValue(C.d(), 'D', "`C.d()` returns `'D'`. Defined as `static ['d']() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C), []),
+  "`compareArray(Object.keys(C), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'b', 'c', 'd']),
+  "`compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'b', 'c', 'd'])` returns `true`"
+);

test/language/computed-property-names/class/static/method-symbol.js

@@ -14,12 +14,18 @@ class C {
   static c() { return 'C'; }
   static [sym2]() { return 'D'; }
 }
-assert.sameValue(C.a(), 'A');
-assert.sameValue(C[sym1](), 'B');
-assert.sameValue(C.c(), 'C');
-assert.sameValue(C[sym2](), 'D');
-assert(compareArray(Object.keys(C), []));
-assert(compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'c']));
+assert.sameValue(C.a(), 'A', "`C.a()` returns `'A'`. Defined as `static a() { return 'A'; }`");
+assert.sameValue(C[sym1](), 'B', "`C[sym1]()` returns `'B'`. Defined as `static [sym1]() { return 'B'; }`");
+assert.sameValue(C.c(), 'C', "`C.c()` returns `'C'`. Defined as `static c() { return 'C'; }`");
+assert.sameValue(C[sym2](), 'D', "`C[sym2]()` returns `'D'`. Defined as `static [sym2]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C), []),
+  "`compareArray(Object.keys(C), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'c']),
+  "`compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'c'])` returns `true`"
+);
 
 
 // compareArray expects arguments to be sorted,
@@ -33,6 +39,16 @@ assert(compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype
 //
 var symbols = Object.getOwnPropertySymbols(C);
 
-assert(symbols.indexOf(sym1) !== -1);
-assert(symbols.indexOf(sym2) !== -1);
-assert.sameValue(symbols.length, 2);
+assert(
+  symbols.indexOf(sym1) !== -1,
+  "The result of `symbols.indexOf(sym1) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(C);`"
+);
+assert(
+  symbols.indexOf(sym2) !== -1,
+  "The result of `symbols.indexOf(sym2) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(C);`"
+);
+assert.sameValue(
+  symbols.length,
+  2,
+  "The value of `symbols.length` is `2`, after executing `var symbols = Object.getOwnPropertySymbols(C);`"
+);

test/language/computed-property-names/duplicate-keys/data.js

@@ -1,13 +0,0 @@
-// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-es6id: 12.2.5
-description: >
-    duplicate computed property names produce only a single property of
-    that name, whose value is the value of the last property of that name.
----*/
-var object = {
-  a: 1,
-  ['a']: 2,
-};
-assert.sameValue(object.a, 2);

test/language/computed-property-names/duplicate-keys/method.js

@@ -1,13 +0,0 @@
-// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-es6id: 12.2.5
-description: >
-    duplicate computed property method names produce only a single property of
-    that name, whose value is the value of the last property of that name.
----*/
-var object = {
-  a() { return 1; },
-  ['a']() { return 2; },
-};
-assert.sameValue(object.a(), 2);

test/language/computed-property-names/duplicate-keys/numbers.js

@@ -1,23 +0,0 @@
-// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-/*---
-es6id: 12.2.5
-description: >
-    computed property names can be numbers
----*/
-var object = {
-  [1.2]: 'A',
-  [1e55]: 'B',
-  [0.000001]: 'C',
-  [-0]: 'D',
-  [Infinity]: 'E',
-  [-Infinity]: 'F',
-  [NaN]: 'G',
-};
-assert.sameValue(object['1.2'], 'A');
-assert.sameValue(object['1e+55'], 'B');
-assert.sameValue(object['0.000001'], 'C');
-assert.sameValue(object[0], 'D');
-assert.sameValue(object[Infinity], 'E');
-assert.sameValue(object[-Infinity], 'F');
-assert.sameValue(object[NaN], 'G');

test/language/computed-property-names/object/accessor/getter-duplicates.js

@@ -0,0 +1,47 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 12.2.5
+description: >
+    In an object, duplicate computed property getter names produce only a single property of
+    that name, whose value is the value of the last property of that name.
+---*/
+var A = {
+  get ['a']() {
+    return 'A';
+  }
+};
+assert.sameValue(A.a, 'A', "The value of `A.a` is `'A'`");
+
+var B = {
+  get b() {
+    $ERROR("The `b` getter definition in `B` is unreachable");
+  },
+  get ['b']() {
+    return 'B';
+  }
+};
+assert.sameValue(B.b, 'B', "The value of `B.b` is `'B'`");
+
+var C = {
+  get c() {
+    $ERROR("The `c` getter definition in `C` is unreachable");
+  },
+  get ['c']() {
+    $ERROR("The `['c']` getter definition in `C` is unreachable");
+  },
+  get ['c']() {
+    return 'C';
+  }
+};
+assert.sameValue(C.c, 'C', "The value of `C.c` is `'C'`");
+
+var D = {
+  get ['d']() {
+    $ERROR("The `['d']` getter definition in `D` is unreachable");
+  },
+  get d() {
+    return 'D';
+  }
+};
+assert.sameValue(D.d, 'D', "The value of `D.d` is `'D'`");

test/language/computed-property-names/object/accessor/getter-super.js

@@ -24,7 +24,23 @@ var object = {
 
 Object.setPrototypeOf(object, proto);
 
-assert.sameValue(object.a, 'a proto m');
-assert.sameValue(object.b, 'b proto m');
-assert.sameValue(object[0], '0 proto m');
-assert.sameValue(object[1], '1 proto m');
+assert.sameValue(
+  object.a,
+  'a proto m',
+  "The value of `object.a` is `'a proto m'`. Defined as `get ['a']() { return 'a' + super.m(); }`"
+);
+assert.sameValue(
+  object.b,
+  'b proto m',
+  "The value of `object.b` is `'b proto m'`. Defined as `get [ID('b')]() { return 'b' + super.m(); }`"
+);
+assert.sameValue(
+  object[0],
+  '0 proto m',
+  "The value of `object[0]` is `'0 proto m'`. Defined as `get [0]() { return '0' + super.m(); }`"
+);
+assert.sameValue(
+  object[1],
+  '1 proto m',
+  "The value of `object[1]` is `'1 proto m'`. Defined as `get [ID(1)]() { return '1' + super.m(); }`"
+);

test/language/computed-property-names/object/accessor/getter.js

@@ -3,45 +3,11 @@
 /*---
 es6id: 12.2.5
 description: >
-    In an object, duplicate computed property getter names produce only a single property of
-    that name, whose value is the value of the last property of that name.
+    Computed property names for getters
 ---*/
-var object = {
-  get ['a']() {
-    return 'A';
+var A = {
+  get ["a"]() {
+    return "A";
   }
 };
-assert.sameValue(object.a, 'A');
-
-object = {
-  get b() {
-    assert(false);
-  },
-  get ['b']() {
-    return 'B';
-  }
-};
-assert.sameValue(object.b, 'B');
-
-object = {
-  get c() {
-    assert(false);
-  },
-  get ['c']() {
-    assert(false);
-  },
-  get ['c']() {
-    return 'C';
-  }
-};
-assert.sameValue(object.c, 'C');
-
-object = {
-  get ['d']() {
-    assert(false);
-  },
-  get d() {
-    return 'D';
-  }
-};
-assert.sameValue(object.d, 'D');
+assert.sameValue(A.a, "A", "The value of `A.a` is `'A'`");

test/language/computed-property-names/object/accessor/setter-duplicates.js

@@ -0,0 +1,55 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 12.2.5
+description: >
+    In an object, duplicate computed property getter names produce only a single property of
+    that name, whose value is the value of the last property of that name.
+---*/
+var calls = 0;
+var A = {
+  set ['a'](_) {
+    calls++;
+  }
+};
+A.a = 'A';
+assert.sameValue(calls, 1, "The value of `calls` is `1`");
+
+calls = 0;
+var B = {
+  set b(_) {
+    $ERROR("The `b` setter definition in `B` is unreachable");
+  },
+  set ['b'](_) {
+    calls++;
+  }
+};
+B.b = 'B';
+assert.sameValue(calls, 1, "The value of `calls` is `1`");
+
+calls = 0;
+var C = {
+  set c(_) {
+    $ERROR("The `c` setter definition in `C` is unreachable");
+  },
+  set ['c'](_) {
+    $ERROR("The first `['c']` setter definition in `C` is unreachable");
+  },
+  set ['c'](_) {
+    calls++
+  }
+};
+C.c = 'C';
+assert.sameValue(calls, 1, "The value of `calls` is `1`");
+
+calls = 0;
+var D = {
+  set ['d'](_) {
+    $ERROR("The `['d']` setter definition in `D` is unreachable");
+  },
+  set d(_) {
+    calls++
+  }
+};
+D.d = 'D';
+assert.sameValue(calls, 1, "The value of `calls` is `1`");

test/language/computed-property-names/object/accessor/setter-super.js

@@ -26,10 +26,10 @@ var object = {
 Object.setPrototypeOf(object, proto);
 
 object.a = 2;
-assert.sameValue(value, 'a 2');
+assert.sameValue(value, 'a 2', "The value of `value` is `'a 2'`, after executing `object.a = 2;`");
 object.b = 3;
-assert.sameValue(value, 'b 3');
+assert.sameValue(value, 'b 3', "The value of `value` is `'b 3'`, after executing `object.b = 3;`");
 object[0] = 4;
-assert.sameValue(value, '0 4');
+assert.sameValue(value, '0 4', "The value of `value` is `'0 4'`, after executing `object[0] = 4;`");
 object[1] = 5;
-assert.sameValue(value, '1 5');
+assert.sameValue(value, '1 5', "The value of `value` is `'1 5'`, after executing `object[1] = 5;`");

test/language/computed-property-names/object/accessor/setter.js

@@ -7,49 +7,10 @@ description: >
     that name, whose value is the value of the last property of that name.
 ---*/
 var calls = 0;
-var object = {
+var A = {
   set ['a'](_) {
     calls++;
   }
 };
-object.a = 'A';
-assert.sameValue(calls, 1);
-
-calls = 0;
-object = {
-  set b(_) {
-    assert(false);
-  },
-  set ['b'](_) {
-    calls++;
-  }
-};
-object.b = 'B';
-assert.sameValue(calls, 1);
-
-calls = 0;
-object = {
-  set c(_) {
-    assert(false)
-  },
-  set ['c'](_) {
-    assert(false)
-  },
-  set ['c'](_) {
-    calls++
-  }
-};
-object.c = 'C';
-assert.sameValue(calls, 1);
-
-calls = 0;
-object = {
-  set ['d'](_) {
-    assert(false)
-  },
-  set d(_) {
-    calls++
-  }
-};
-object.d = 'D';
-assert.sameValue(calls, 1);
+A.a = 'A';
+assert.sameValue(calls, 1, "The value of `calls` is `1`, after executing `A.a = 'A';`");

test/language/computed-property-names/object/method/generator.js

@@ -12,4 +12,7 @@ var object = {
     yield 2;
   }
 };
-assert(compareArray(Object.keys(object), ['a']));
+assert(
+  compareArray(Object.keys(object), ['a']),
+  "`compareArray(Object.keys(object), ['a'])` returns `true`"
+);

test/language/computed-property-names/object/method/number.js

@@ -17,8 +17,11 @@ var object = {
   c() { return 'C'; },
   [ID(2)]() { return 'D'; },
 };
-assert.sameValue(object.a(), 'A');
-assert.sameValue(object[1](), 'B');
-assert.sameValue(object.c(), 'C');
-assert.sameValue(object[2](), 'D');
-assert(compareArray(Object.keys(object), ['1', '2', 'a', 'c']));
+assert.sameValue(object.a(), 'A', "`object.a()` returns `'A'`. Defined as `a() { return 'A'; }`");
+assert.sameValue(object[1](), 'B', "`object[1]()` returns `'B'`. Defined as `[1]() { return 'B'; }`");
+assert.sameValue(object.c(), 'C', "`object.c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(object[2](), 'D', "`object[2]()` returns `'D'`. Defined as `[ID(2)]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(object), ['1', '2', 'a', 'c']),
+  "`compareArray(Object.keys(object), ['1', '2', 'a', 'c'])` returns `true`"
+);

test/language/computed-property-names/object/method/string.js

@@ -17,8 +17,11 @@ var object = {
   c() { return 'C'; },
   [ID('d')]() { return 'D'; },
 };
-assert.sameValue(object.a(), 'A');
-assert.sameValue(object.b(), 'B');
-assert.sameValue(object.c(), 'C');
-assert.sameValue(object.d(), 'D');
-assert(compareArray(Object.keys(object), ['a', 'b', 'c', 'd']));
+assert.sameValue(object.a(), 'A', "`object.a()` returns `'A'`. Defined as `a() { return 'A'}`");
+assert.sameValue(object.b(), 'B', "`object.b()` returns `'B'`. Defined as `['b']() { return 'B'; }`");
+assert.sameValue(object.c(), 'C', "`object.c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(object.d(), 'D', "`object.d()` returns `'D'`. Defined as `[ID('d')]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(object), ['a', 'b', 'c', 'd']),
+  "`compareArray(Object.keys(object), ['a', 'b', 'c', 'd'])` returns `true`"
+);

test/language/computed-property-names/object/method/super.js

@@ -24,7 +24,7 @@ var object = {
 
 Object.setPrototypeOf(object, proto);
 
-assert.sameValue(object.a(), 'a proto m');
-assert.sameValue(object.b(), 'b proto m');
-assert.sameValue(object[0](), '0 proto m');
-assert.sameValue(object[1](), '1 proto m');
+assert.sameValue(object.a(), 'a proto m', "`object.a()` returns `'a proto m'`, after executing `Object.setPrototypeOf(object, proto);`");
+assert.sameValue(object.b(), 'b proto m', "`object.b()` returns `'b proto m'`, after executing `Object.setPrototypeOf(object, proto);`");
+assert.sameValue(object[0](), '0 proto m', "`object[0]()` returns `'0 proto m'`, after executing `Object.setPrototypeOf(object, proto);`");
+assert.sameValue(object[1](), '1 proto m', "`object[1]()` returns `'1 proto m'`, after executing `Object.setPrototypeOf(object, proto);`");

test/language/computed-property-names/object/method/symbol.js

@@ -19,11 +19,14 @@ var object = {
   c() { return 'C'; },
   [ID(sym2)]() { return 'D'; },
 };
-assert.sameValue(object.a(), 'A');
-assert.sameValue(object[sym1](), 'B');
-assert.sameValue(object.c(), 'C');
-assert.sameValue(object[sym2](), 'D');
-assert(compareArray(Object.keys(object), ['a', 'c']));
+assert.sameValue(object.a(), 'A', "`object.a()` returns `'A'`. Defined as `a() { return 'A'; }`");
+assert.sameValue(object[sym1](), 'B', "`object[sym1]()` returns `'B'`. Defined as `[sym1]() { return 'B'; }`");
+assert.sameValue(object.c(), 'C', "`object.c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(object[sym2](), 'D', "`object[sym2]()` returns `'D'`. Defined as `[ID(sym2)]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(object), ['a', 'c']),
+  "`compareArray(Object.keys(object), ['a', 'c'])` returns `true`"
+);
 
 // compareArray expects arguments to be sorted,
 // which will cause an array containing symbols to
@@ -36,6 +39,12 @@ assert(compareArray(Object.keys(object), ['a', 'c']));
 //
 var symbols = Object.getOwnPropertySymbols(object);
 
-assert(symbols.indexOf(sym1) !== -1);
-assert(symbols.indexOf(sym2) !== -1);
-assert.sameValue(symbols.length, 2);
+assert(
+  symbols.indexOf(sym1) !== -1,
+  "The result of `symbols.indexOf(sym1) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(object);`"
+);
+assert(
+  symbols.indexOf(sym2) !== -1,
+  "The result of `symbols.indexOf(sym2) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(object);`"
+);
+assert.sameValue(symbols.length, 2, "The value of `symbols.length` is `2`, after executing `var symbols = Object.getOwnPropertySymbols(object);`");

test/language/computed-property-names/object/property/number-duplicates.js

@@ -0,0 +1,50 @@
+// Copyright (C) Copyright 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 12.2.5
+description: >
+    computed property names can be numbers
+---*/
+var object = {
+  [1.2]: 'A',
+  [1e55]: 'B',
+  [0.000001]: 'C',
+  [-0]: 'D',
+  [Infinity]: 'E',
+  [-Infinity]: 'F',
+  [NaN]: 'G',
+};
+assert.sameValue(
+  object['1.2'],
+  'A',
+  "The value of `object['1.2']` is `'A'`. Defined as `[1.2]: 'A'`"
+);
+assert.sameValue(
+  object['1e+55'],
+  'B',
+  "The value of `object['1e+55']` is `'B'`. Defined as `[1e55]: 'B'`"
+);
+assert.sameValue(
+  object['0.000001'],
+  'C',
+  "The value of `object['0.000001']` is `'C'`. Defined as `[0.000001]: 'C'`"
+);
+assert.sameValue(
+  object[0],
+  'D',
+  "The value of `object[0]` is `'D'`. Defined as `[-0]: 'D'`"
+);
+assert.sameValue(object[Infinity],
+  'E',
+  "The value of `object[Infinity]` is `'E'`. Defined as `[Infinity]: 'E'`"
+);
+assert.sameValue(
+  object[-Infinity],
+  'F',
+  "The value of `object[-Infinity]` is `'F'`. Defined as `[-Infinity]: 'F'`"
+);
+assert.sameValue(
+  object[NaN],
+  'G',
+  "The value of `object[NaN]` is `'G'`. Defined as `[NaN]: 'G'`"
+);

test/language/computed-property-names/to-name-side-effects/class.js

@@ -9,13 +9,13 @@ includes: [compareArray.js]
 var counter = 0;
 var key1 = {
   toString: function() {
-    assert.sameValue(counter++, 0);
+    assert.sameValue(counter++, 0, "The result of `counter++` is `0`");
     return 'b';
   }
 };
 var key2 = {
   toString: function() {
-    assert.sameValue(counter++, 1);
+    assert.sameValue(counter++, 1, "The result of `counter++` is `1`");
     return 'd';
   }
 };
@@ -25,10 +25,16 @@ class C {
   c() { return 'C'; }
   [key2]() { return 'D'; }
 }
-assert.sameValue(counter, 2);
-assert.sameValue(new C().a(), 'A');
-assert.sameValue(new C().b(), 'B');
-assert.sameValue(new C().c(), 'C');
-assert.sameValue(new C().d(), 'D');
-assert(compareArray(Object.keys(C.prototype), []));
-assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'b', 'c', 'd']));
+assert.sameValue(counter, 2, "The value of `counter` is `2`");
+assert.sameValue(new C().a(), 'A', "`new C().a()` returns `'A'`. Defined as `a() { return 'A'; }`");
+assert.sameValue(new C().b(), 'B', "`new C().b()` returns `'B'`. Defined as `[key1]() { return 'B'; }`");
+assert.sameValue(new C().c(), 'C', "`new C().c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(new C().d(), 'D', "`new C().d()` returns `'D'`. Defined as `[key2]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C.prototype), []),
+  "`compareArray(Object.keys(C.prototype), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'b', 'c', 'd']),
+  "`compareArray(Object.getOwnPropertyNames(C.prototype), ['constructor', 'a', 'b', 'c', 'd'])` returns `true`"
+);

test/language/computed-property-names/to-name-side-effects/numbers-class.js

@@ -9,14 +9,14 @@ includes: [compareArray.js]
 var counter = 0;
 var key1 = {
   valueOf: function() {
-    assert.sameValue(counter++, 0);
+    assert.sameValue(counter++, 0, "The result of `counter++` is `0`");
     return 1;
   },
   toString: null
 };
 var key2 = {
   valueOf: function() {
-    assert.sameValue(counter++, 1);
+    assert.sameValue(counter++, 1, "The result of `counter++` is `1`");
     return 2;
   },
   toString: null
@@ -28,10 +28,16 @@ class C {
   c() { return 'C'; }
   [key2]() { return 'D'; }
 }
-assert.sameValue(counter, 2);
-assert.sameValue(new C().a(), 'A');
-assert.sameValue(new C()[1](), 'B');
-assert.sameValue(new C().c(), 'C');
-assert.sameValue(new C()[2](), 'D');
-assert(compareArray(Object.keys(C.prototype), []));
-assert(compareArray(Object.getOwnPropertyNames(C.prototype), ['1', '2', 'constructor', 'a', 'c']));
+assert.sameValue(counter, 2, "The value of `counter` is `2`");
+assert.sameValue(new C().a(), 'A', "`new C().a()` returns `'A'`. Defined as `a() { return 'A'; }`");
+assert.sameValue(new C()[1](), 'B', "`new C()[1]()` returns `'B'`. Defined as `[key1]() { return 'B'; }`");
+assert.sameValue(new C().c(), 'C', "`new C().c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(new C()[2](), 'D', "`new C()[2]()` returns `'D'`. Defined as `[key2]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(C.prototype), []),
+  "`compareArray(Object.keys(C.prototype), [])` returns `true`"
+);
+assert(
+  compareArray(Object.getOwnPropertyNames(C.prototype), ['1', '2', 'constructor', 'a', 'c']),
+  "`compareArray(Object.getOwnPropertyNames(C.prototype), ['1', '2', 'constructor', 'a', 'c'])` returns `true`"
+);

test/language/computed-property-names/to-name-side-effects/numbers-object.js

@@ -9,14 +9,14 @@ includes: [compareArray.js]
 var counter = 0;
 var key1 = {
   valueOf: function() {
-    assert.sameValue(counter++, 0);
+    assert.sameValue(counter++, 0, "The result of `counter++` is `0`");
     return 1;
   },
   toString: null
 };
 var key2 = {
   valueOf: function() {
-    assert.sameValue(counter++, 1);
+    assert.sameValue(counter++, 1, "The result of `counter++` is `1`");
     return 2;
   },
   toString: null
@@ -28,9 +28,12 @@ var object = {
   c: 'C',
   [key2]: 'D',
 };
-assert.sameValue(counter, 2);
-assert.sameValue(object.a, 'A');
-assert.sameValue(object[1], 'B');
-assert.sameValue(object.c, 'C');
-assert.sameValue(object[2], 'D');
-assert(compareArray(Object.keys(object), ['1', '2', 'a', 'c']));
+assert.sameValue(counter, 2, "The value of `counter` is `2`");
+assert.sameValue(object.a, 'A', "The value of `object.a` is `'A'`. Defined as `a: 'A'`");
+assert.sameValue(object[1], 'B', "The value of `object[1]` is `'B'`. Defined as `[key1]: 'B'`");
+assert.sameValue(object.c, 'C', "The value of `object.c` is `'C'`. Defined as `c: 'C'`");
+assert.sameValue(object[2], 'D', "The value of `object[2]` is `'D'`. Defined as `[key2]: 'D'`");
+assert(
+  compareArray(Object.keys(object), ['1', '2', 'a', 'c']),
+  "`compareArray(Object.keys(object), ['1', '2', 'a', 'c'])` returns `true`"
+);

test/language/computed-property-names/to-name-side-effects/object.js

@@ -9,13 +9,13 @@ includes: [compareArray.js]
 var counter = 0;
 var key1 = {
   toString: function() {
-    assert.sameValue(counter++, 0);
+    assert.sameValue(counter++, 0, "The result of `counter++` is `0`");
     return 'b';
   }
 };
 var key2 = {
   toString: function() {
-    assert.sameValue(counter++, 1);
+    assert.sameValue(counter++, 1, "The result of `counter++` is `1`");
     return 'd';
   }
 };
@@ -25,9 +25,12 @@ var object = {
   c() { return 'C'; },
   [key2]() { return 'D'; },
 };
-assert.sameValue(counter, 2);
-assert.sameValue(object.a(), 'A');
-assert.sameValue(object.b(), 'B');
-assert.sameValue(object.c(), 'C');
-assert.sameValue(object.d(), 'D');
-assert(compareArray(Object.keys(object), ['a', 'b', 'c', 'd']));
+assert.sameValue(counter, 2, "The value of `counter` is `2`");
+assert.sameValue(object.a(), 'A', "`object.a()` returns `'A'`. Defined as `a() { return 'A'; }`");
+assert.sameValue(object.b(), 'B', "`object.b()` returns `'B'`. Defined as `[key1]() { return 'B'; }`");
+assert.sameValue(object.c(), 'C', "`object.c()` returns `'C'`. Defined as `c() { return 'C'; }`");
+assert.sameValue(object.d(), 'D', "`object.d()` returns `'D'`. Defined as `[key2]() { return 'D'; }`");
+assert(
+  compareArray(Object.keys(object), ['a', 'b', 'c', 'd']),
+  "`compareArray(Object.keys(object), ['a', 'b', 'c', 'd'])` returns `true`"
+);