1 files changed, 253 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_variables-view-large-array-buffer.js b/devtools/client/debugger/test/mochitest/browser_dbg_variables-view-large-array-buffer.js
new file mode 100644
index 000000000..7ec1fe2f0
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg_variables-view-large-array-buffer.js
@@ -0,0 +1,253 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Make sure that the variables view remains responsive when faced with
+ * huge ammounts of data.
+ */
+
+"use strict";
+
+const TAB_URL = EXAMPLE_URL + "doc_large-array-buffer.html";
+const {ELLIPSIS} = require("devtools/shared/l10n");
+
+
+var gTab, gPanel, gDebugger, gVariables;
+
+function test() {
+  // this test does a lot of work on large objects, default 45s is not enough
+  requestLongerTimeout(4);
+
+  let options = {
+    source: TAB_URL,
+    line: 1
+  };
+  initDebugger(TAB_URL, options).then(([aTab,, aPanel]) => {
+    gTab = aTab;
+    gPanel = aPanel;
+    gDebugger = gPanel.panelWin;
+    gVariables = gDebugger.DebuggerView.Variables;
+
+    waitForCaretAndScopes(gPanel, 28, 1)
+      .then(() => performTests())
+      .then(() => resumeDebuggerThenCloseAndFinish(gPanel))
+      .then(null, error => {
+        ok(false, "Got an error: " + error.message + "\n" + error.stack);
+      });
+
+    generateMouseClickInTab(gTab, "content.document.querySelector('button')");
+  });
+}
+
+const VARS_TO_TEST = [
+  {
+    varName: "buffer",
+    stringified: "ArrayBuffer",
+    doNotExpand: true
+  },
+  {
+    varName: "largeArray",
+    stringified: "Int8Array[10000]",
+    extraProps: [
+      [ "buffer", "ArrayBuffer" ],
+      [ "byteLength", "10000" ],
+      [ "byteOffset", "0" ],
+      [ "length", "10000" ],
+      [ "__proto__", "Int8ArrayPrototype" ]
+    ]
+  },
+  {
+    varName: "largeObject",
+    stringified: "Object[10000]",
+    extraProps: [
+      [ "__proto__", "Object" ]
+    ]
+  },
+  {
+    varName: "largeMap",
+    stringified: "Map[10000]",
+    hasEntries: true,
+    extraProps: [
+      [ "size", "10000" ],
+      [ "__proto__", "Object" ]
+    ]
+  },
+  {
+    varName: "largeSet",
+    stringified: "Set[10000]",
+    hasEntries: true,
+    extraProps: [
+      [ "size", "10000" ],
+      [ "__proto__", "Object" ]
+    ]
+  }
+];
+
+const PAGE_RANGES = [
+  [0, 2499], [2500, 4999], [5000, 7499], [7500, 9999]
+];
+
+function toPageNames(ranges) {
+  return ranges.map(([ from, to ]) => "[" + from + ELLIPSIS + to + "]");
+}
+
+function performTests() {
+  let localScope = gVariables.getScopeAtIndex(0);
+
+  return promise.all(VARS_TO_TEST.map(spec => {
+    let { varName, stringified, doNotExpand } = spec;
+
+    let variable = localScope.get(varName);
+    ok(variable,
+      `There should be a '${varName}' variable present in the scope.`);
+
+    is(variable.target.querySelector(".name").getAttribute("value"), varName,
+      `Should have the right property name for '${varName}'.`);
+    is(variable.target.querySelector(".value").getAttribute("value"), stringified,
+      `Should have the right property value for '${varName}'.`);
+    ok(variable.target.querySelector(".value").className.includes("token-other"),
+      `Should have the right token class for '${varName}'.`);
+
+    is(variable.expanded, false,
+      `The '${varName}' variable shouldn't be expanded.`);
+
+    if (doNotExpand) {
+      return promise.resolve();
+    }
+
+    return variable.expand()
+      .then(() => verifyFirstLevel(variable, spec));
+  }));
+}
+
+// In objects and arrays, the sliced pages are at the top-level of
+// the expanded object, but with Maps and Sets, we have to expand
+// <entries> first and look there.
+function getExpandedPages(variable, hasEntries) {
+  let expandedPages = promise.defer();
+  if (hasEntries) {
+    let entries = variable.get("<entries>");
+    ok(entries, "<entries> retrieved");
+    entries.expand().then(() => expandedPages.resolve(entries));
+  } else {
+    expandedPages.resolve(variable);
+  }
+
+  return expandedPages.promise;
+}
+
+function verifyFirstLevel(variable, spec) {
+  let { varName, hasEntries, extraProps } = spec;
+
+  let enums = variable._enum.childNodes;
+  let nonEnums = variable._nonenum.childNodes;
+
+  is(enums.length, hasEntries ? 1 : 4,
+    `The '${varName}' contains the right number of enumerable elements.`);
+  is(nonEnums.length, extraProps.length,
+    `The '${varName}' contains the right number of non-enumerable elements.`);
+
+  // the sliced pages begin after <entries> row
+  let pagesOffset = hasEntries ? 1 : 0;
+  let expandedPages = getExpandedPages(variable, hasEntries);
+
+  return expandedPages.then((pagesList) => {
+    toPageNames(PAGE_RANGES).forEach((pageName, i) => {
+      let index = i + pagesOffset;
+
+      is(pagesList.target.querySelectorAll(".variables-view-property .name")[index].getAttribute("value"),
+        pageName, `The page #${i + 1} in the '${varName}' is named correctly.`);
+      is(pagesList.target.querySelectorAll(".variables-view-property .value")[index].getAttribute("value"),
+        "", `The page #${i + 1} in the '${varName}' should not have a corresponding value.`);
+    });
+  }).then(() => {
+    extraProps.forEach(([ propName, propValue ], i) => {
+      // the extra props start after the 4 pages
+      let index = i + pagesOffset + 4;
+
+      is(variable.target.querySelectorAll(".variables-view-property .name")[index].getAttribute("value"),
+        propName, `The other properties in '${varName}' are named correctly.`);
+      is(variable.target.querySelectorAll(".variables-view-property .value")[index].getAttribute("value"),
+        propValue, `The other properties in '${varName}' have the correct value.`);
+    });
+  }).then(() => verifyNextLevels(variable, spec));
+}
+
+function verifyNextLevels(variable, spec) {
+  let { varName, hasEntries } = spec;
+
+  // the entries are already expanded in verifyFirstLevel
+  let pagesList = hasEntries ? variable.get("<entries>") : variable;
+
+  let lastPage = pagesList.get(toPageNames(PAGE_RANGES)[3]);
+  ok(lastPage, `The last page in the 1st level of '${varName}' was retrieved successfully.`);
+
+  return lastPage.expand()
+    .then(() => verifyNextLevels2(lastPage, varName));
+}
+
+function verifyNextLevels2(lastPage1, varName) {
+  const PAGE_RANGES_IN_LAST_PAGE = [
+    [7500, 8124], [8125, 8749], [8750, 9374], [9375, 9999]
+  ];
+
+  let pageEnums1 = lastPage1._enum.childNodes;
+  let pageNonEnums1 = lastPage1._nonenum.childNodes;
+  is(pageEnums1.length, 4,
+    `The last page in the 1st level of '${varName}' should contain all the created enumerable elements.`);
+  is(pageNonEnums1.length, 0,
+    `The last page in the 1st level of '${varName}' should not contain any non-enumerable elements.`);
+
+  let pageNames = toPageNames(PAGE_RANGES_IN_LAST_PAGE);
+  pageNames.forEach((pageName, i) => {
+    is(lastPage1._enum.querySelectorAll(".variables-view-property .name")[i].getAttribute("value"),
+      pageName, `The page #${i + 1} in the 2nd level of '${varName}' is named correctly.`);
+  });
+
+  let lastPage2 = lastPage1.get(pageNames[3]);
+  ok(lastPage2, "The last page in the 2nd level was retrieved successfully.");
+
+  return lastPage2.expand()
+    .then(() => verifyNextLevels3(lastPage2, varName));
+}
+
+function verifyNextLevels3(lastPage2, varName) {
+  let pageEnums2 = lastPage2._enum.childNodes;
+  let pageNonEnums2 = lastPage2._nonenum.childNodes;
+  is(pageEnums2.length, 625,
+    `The last page in the 3rd level of '${varName}' should contain all the created enumerable elements.`);
+  is(pageNonEnums2.length, 0,
+    `The last page in the 3rd level of '${varName}' shouldn't contain any non-enumerable elements.`);
+
+  const LEAF_ITEMS = [
+    [0, 9375, 624],
+    [1, 9376, 623],
+    [623, 9998, 1],
+    [624, 9999, 0]
+  ];
+
+  function expectedValue(name, value) {
+    switch (varName) {
+      case "largeArray": return 0;
+      case "largeObject": return value;
+      case "largeMap": return name + " \u2192 " + value;
+      case "largeSet": return value;
+    }
+  }
+
+  LEAF_ITEMS.forEach(([index, name, value]) => {
+    is(lastPage2._enum.querySelectorAll(".variables-view-property .name")[index].getAttribute("value"),
+      name, `The properties in the leaf level of '${varName}' are named correctly.`);
+    is(lastPage2._enum.querySelectorAll(".variables-view-property .value")[index].getAttribute("value"),
+      expectedValue(name, value), `The properties in the leaf level of '${varName}' have the correct value.`);
+  });
+}
+
+registerCleanupFunction(function () {
+  gTab = null;
+  gPanel = null;
+  gDebugger = null;
+  gVariables = null;
+});