[inspector] filter useless in preview internal properties

test/inspector/debugger/object-preview-internal-properties.js

+// Copyright 2016 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("Check internal properties reported in object preview.");
+
+Protocol.Debugger.enable();
+Protocol.Runtime.enable();
+Protocol.Runtime.onConsoleAPICalled(dumpInternalPropertiesAndEntries);
+
+InspectorTest.runTestSuite([
+  function boxedObjects(next)
+  {
+    checkExpression("new Number(239)")
+      .then(() => checkExpression("new Boolean(false)"))
+      .then(() => checkExpression("new String(\"abc\")"))
+      .then(() => checkExpression("Object(Symbol(42))"))
+      .then(next);
+  },
+
+  function promise(next)
+  {
+    checkExpression("Promise.resolve(42)")
+      .then(() => checkExpression("new Promise(() => undefined)"))
+      .then(next);
+  },
+
+  function generatorObject(next)
+  {
+    checkExpression("(function* foo() { yield 1 })()")
+      .then(next);
+  },
+
+  function entriesInMapAndSet(next)
+  {
+    checkExpression("new Map([[1,2]])")
+      .then(() => checkExpression("new Set([1])"))
+      .then(() => checkExpression("new WeakMap([[{}, 42]])"))
+      .then(() => checkExpression("new WeakSet([{}])"))
+      .then(next);
+  },
+
+  function iteratorObject(next)
+  {
+    checkExpression("(new Map([[1,2]])).entries()")
+      .then(() => checkExpression("(new Set([[1,2]])).entries()"))
+      .then(next);
+  },
+
+  function noPreviewForFunctionObject(next)
+  {
+    var expression = "(function foo(){})";
+    InspectorTest.log(expression);
+    Protocol.Runtime.evaluate({ expression: expression, generatePreview: true})
+      .then(message => InspectorTest.logMessage(message))
+      .then(next);
+  },
+
+  function otherObjects(next)
+  {
+    checkExpression("[1,2,3]")
+      .then(() => checkExpression("/123/"))
+      .then(() => checkExpression("({})"))
+      .then(next);
+  },
+
+  function overridenArrayGetter(next)
+  {
+    Protocol.Runtime.evaluate({ expression: "Array.prototype.__defineGetter__(\"0\",() => { throw new Error() }) "})
+      .then(() => checkExpression("Promise.resolve(42)"))
+      .then(next);
+  }
+]);
+
+function checkExpression(expression)
+{
+  InspectorTest.log(`expression: ${expression}`);
+  // console.table has higher limits for internal properties amount in preview.
+  return Protocol.Runtime.evaluate({ expression: `console.table(${expression})`, generatePreview: true });
+}
+
+function dumpInternalPropertiesAndEntries(message)
+{
+  var properties;
+  var entries;
+  try {
+    var preview = message.params.args[0].preview;
+    properties = preview.properties;
+    entries = preview.entries;
+  } catch (e) {
+    InspectorTest.logMessage(message);
+    return;
+  }
+  if (!properties) {
+    InspectorTest.logMessage(message);
+    return;
+  }
+  for (var property of properties) {
+    if (property.name.startsWith("[["))
+      InspectorTest.logMessage(property);
+  }
+  if (entries) {
+    InspectorTest.log("[[Entries]]:");
+    InspectorTest.logMessage(entries);
+  }
+  InspectorTest.log("");
+}