[inspector] introduced v8::debug::EntriesPreview for inspector

test/inspector/runtime/internal-properties-entries.js

+// Copyright 2017 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.
+
+print('Checks internal [[Entries]] in Runtime.getProperties output');
+
+Protocol.Runtime.enable();
+
+InspectorTest.runTestSuite([
+  function maps(next) {
+    checkExpression('new Map([[1,2],[3,4]])')
+      .then(() => checkExpression('new Map()'))
+      .then(next);
+  },
+
+  function mapIterators(next) {
+    checkExpression('new Map([[1,2],[3,4]]).entries()')
+      .then(() => checkExpression('it = new Map([[1,2],[3,4]]).entries(); it.next(); it'))
+      .then(() => checkExpression('it = new Map([[1,2],[3,4]]).keys(); it.next(); it'))
+      .then(() => checkExpression('it = new Map([[1,2],[3,4]]).values(); it.next(); it'))
+      .then(() => checkExpression('it = new Map([[1,2],[3,4]]).entries(); it.next(); it.next(); it'))
+      .then(next);
+  },
+
+  function sets(next) {
+    checkExpression('new Set([1,2])')
+      .then(() => checkExpression('new Set()'))
+      .then(next);
+  },
+
+  function setIterators(next) {
+    checkExpression('new Set([1,2]).values()')
+      .then(() => checkExpression('it = new Set([1,2]).values(); it.next(); it'))
+      .then(() => checkExpression('it = new Set([1,2]).keys(); it.next(); it'))
+      .then(() => checkExpression('it = new Set([1,2]).entries(); it.next(); it'))
+      .then(() => checkExpression('it = new Set([1,2]).values(); it.next(); it.next(); it'))
+      .then(next);
+  },
+
+  function weakMaps(next) {
+    checkExpression('new WeakMap()')
+      .then(() => checkExpression('new WeakMap([[{ a: 2 }, 42]])'))
+      .then(next);
+  },
+
+  function weakSets(next) {
+    checkExpression('new WeakSet()')
+      .then(() => checkExpression('new WeakSet([{a:2}])'))
+      .then(next);
+  }
+]);
+
+function checkExpression(expression)
+{
+  InspectorTest.log(`expression: ${expression}`);
+  var entriesObjectId;
+  return Protocol.Runtime.evaluate({ expression: expression })
+    .then(message => Protocol.Runtime.getProperties({ objectId: message.result.result.objectId }))
+    .then(message => message.result.internalProperties.filter(p => p.name === '[[Entries]]')[0])
+    .then(entries => entriesObjectId = entries.value.objectId)
+    .then(() => Protocol.Runtime.callFunctionOn({ objectId: entriesObjectId, functionDeclaration: 'function f() { return this; }', returnByValue: true }))
+    .then(message => InspectorTest.logMessage(message.result.result.value))
+    .then(() => Protocol.Runtime.getProperties({ objectId: entriesObjectId, ownProperties: true }))
+    .then(message => InspectorTest.logMessage(message));
+}