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diff --git a/toolkit/components/autocomplete/tests/unit/test_440866.js b/toolkit/components/autocomplete/tests/unit/test_440866.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Unit test for Bug 440866 - First AutoCompleteSearch that returns
+ * RESULT_NOMATCH cancels all other searches when popup is open
+ */
+
+
+
+/**
+ * Dummy nsIAutoCompleteInput source that returns
+ * the given list of AutoCompleteSearch names.
+ *
+ * Implements only the methods needed for this test.
+ */
+function AutoCompleteInput(aSearches) {
+  this.searches = aSearches;
+}
+AutoCompleteInput.prototype = {
+  constructor: AutoCompleteInput,
+
+  // Array of AutoCompleteSearch names
+  searches: null,
+
+  minResultsForPopup: 0,
+  timeout: 10,
+  searchParam: "",
+  textValue: "",
+  disableAutoComplete: false,
+  completeDefaultIndex: false,
+
+  get searchCount() {
+    return this.searches.length;
+  },
+
+  getSearchAt: function(aIndex) {
+    return this.searches[aIndex];
+  },
+
+  onSearchBegin: function() {},
+  onSearchComplete: function() {},
+
+  popupOpen: false,
+
+  popup: {
+    setSelectedIndex: function(aIndex) {},
+    invalidate: function() {},
+
+    // nsISupports implementation
+    QueryInterface: function(iid) {
+      if (iid.equals(Ci.nsISupports) ||
+          iid.equals(Ci.nsIAutoCompletePopup))
+        return this;
+
+      throw Components.results.NS_ERROR_NO_INTERFACE;
+    }
+  },
+
+  // nsISupports implementation
+  QueryInterface: function(iid) {
+    if (iid.equals(Ci.nsISupports) ||
+        iid.equals(Ci.nsIAutoCompleteInput))
+      return this;
+
+    throw Components.results.NS_ERROR_NO_INTERFACE;
+  }
+}
+
+
+
+/**
+ * nsIAutoCompleteResult implementation
+ */
+function AutoCompleteResult(aValues, aComments, aStyles) {
+  this._values = aValues;
+  this._comments = aComments;
+  this._styles = aStyles;
+
+  if (this._values.length > 0) {
+    this.searchResult = Ci.nsIAutoCompleteResult.RESULT_SUCCESS;
+  } else {
+    this.searchResult = Ci.nsIAutoCompleteResult.NOMATCH;
+  }
+}
+AutoCompleteResult.prototype = {
+  constructor: AutoCompleteResult,
+
+  // Arrays
+  _values: null,
+  _comments: null,
+  _styles: null,
+
+  searchString: "",
+  searchResult: null,
+
+  defaultIndex: 0,
+
+  get matchCount() {
+    return this._values.length;
+  },
+
+  getValueAt: function(aIndex) {
+    return this._values[aIndex];
+  },
+
+  getLabelAt: function(aIndex) {
+    return this.getValueAt(aIndex);
+  },
+
+  getCommentAt: function(aIndex) {
+    return this._comments[aIndex];
+  },
+
+  getStyleAt: function(aIndex) {
+    return this._styles[aIndex];
+  },
+
+  getImageAt: function(aIndex) {
+    return "";
+  },
+
+  getFinalCompleteValueAt: function(aIndex) {
+    return this.getValueAt(aIndex);
+  },
+
+  removeValueAt: function (aRowIndex, aRemoveFromDb) {},
+
+  // nsISupports implementation
+  QueryInterface: function(iid) {
+    if (iid.equals(Ci.nsISupports) ||
+        iid.equals(Ci.nsIAutoCompleteResult))
+      return this;
+
+    throw Components.results.NS_ERROR_NO_INTERFACE;
+  }
+}
+
+
+
+/**
+ * nsIAutoCompleteSearch implementation that always returns
+ * the same result set.
+ */
+function AutoCompleteSearch(aName, aResult) {
+  this.name = aName;
+  this._result = aResult;
+}
+AutoCompleteSearch.prototype = {
+  constructor: AutoCompleteSearch,
+
+  // Search name. Used by AutoCompleteController
+  name: null,
+
+  // AutoCompleteResult
+  _result:null,
+
+
+  /**
+   * Return the same result set for every search
+   */
+  startSearch: function(aSearchString,
+                        aSearchParam,
+                        aPreviousResult,
+                        aListener)
+  {
+    aListener.onSearchResult(this, this._result);
+  },
+
+  stopSearch: function() {},
+
+  // nsISupports implementation
+  QueryInterface: function(iid) {
+    if (iid.equals(Ci.nsISupports) ||
+        iid.equals(Ci.nsIFactory) ||
+        iid.equals(Ci.nsIAutoCompleteSearch))
+      return this;
+
+    throw Components.results.NS_ERROR_NO_INTERFACE;
+  },
+
+  // nsIFactory implementation
+  createInstance: function(outer, iid) {
+    return this.QueryInterface(iid);
+  }
+}
+
+
+
+/**
+ * Helper to register an AutoCompleteSearch with the given name.
+ * Allows the AutoCompleteController to find the search.
+ */
+function registerAutoCompleteSearch(aSearch) {
+  var name = "@mozilla.org/autocomplete/search;1?name=" + aSearch.name;
+
+  var uuidGenerator = Cc["@mozilla.org/uuid-generator;1"].
+                      getService(Ci.nsIUUIDGenerator);
+  var cid = uuidGenerator.generateUUID();
+
+  var desc = "Test AutoCompleteSearch";
+
+  var componentManager = Components.manager
+                                   .QueryInterface(Ci.nsIComponentRegistrar);
+  componentManager.registerFactory(cid, desc, name, aSearch);
+
+  // Keep the id on the object so we can unregister later
+  aSearch.cid = cid;
+}
+
+
+
+/**
+ * Helper to unregister an AutoCompleteSearch.
+ */
+function unregisterAutoCompleteSearch(aSearch) {
+  var componentManager = Components.manager
+                                   .QueryInterface(Ci.nsIComponentRegistrar);
+  componentManager.unregisterFactory(aSearch.cid, aSearch);
+}
+
+
+
+/**
+ * Test AutoComplete with multiple AutoCompleteSearch sources.
+ */
+function run_test() {
+
+  // Make an AutoCompleteSearch that always returns nothing
+  var emptySearch = new AutoCompleteSearch("test-empty-search",
+                             new AutoCompleteResult([], [], []));
+
+  // Make an AutoCompleteSearch that returns two values
+  var expectedValues = ["test1", "test2"];
+  var regularSearch = new AutoCompleteSearch("test-regular-search",
+                             new AutoCompleteResult(expectedValues, [], []));
+
+  // Register searches so AutoCompleteController can find them
+  registerAutoCompleteSearch(emptySearch);
+  registerAutoCompleteSearch(regularSearch);
+
+  var controller = Components.classes["@mozilla.org/autocomplete/controller;1"].
+                   getService(Components.interfaces.nsIAutoCompleteController);
+
+  // Make an AutoCompleteInput that uses our searches
+  // and confirms results on search complete
+  var input = new AutoCompleteInput([emptySearch.name, regularSearch.name]);
+  var numSearchesStarted = 0;
+
+  input.onSearchBegin = function() {
+    numSearchesStarted++;
+    do_check_eq(numSearchesStarted, 1);
+    do_check_eq(input.searchCount, 2);
+  };
+
+  input.onSearchComplete = function() {
+    do_check_eq(numSearchesStarted, 1);
+
+    do_check_eq(controller.searchStatus,
+                Ci.nsIAutoCompleteController.STATUS_COMPLETE_MATCH);
+    do_check_eq(controller.matchCount, 2);
+
+    // Confirm expected result values
+    for (var i = 0; i < expectedValues.length; i++) {
+      do_check_eq(expectedValues[i], controller.getValueAt(i));
+    }
+
+    do_check_true(input.popupOpen);
+
+    // Unregister searches
+    unregisterAutoCompleteSearch(emptySearch);
+    unregisterAutoCompleteSearch(regularSearch);
+
+    do_test_finished();
+  };
+
+  controller.input = input;
+
+  // Search is asynchronous, so don't let the test finish immediately
+  do_test_pending();
+
+  controller.startSearch("test");
+}
+