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diff --git a/toolkit/content/tests/browser/browser_bug1198465.js b/toolkit/content/tests/browser/browser_bug1198465.js
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+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var kPrefName = "accessibility.typeaheadfind.prefillwithselection";
+var kEmptyURI = "data:text/html,";
+
+// This pref is false by default in OSX; ensure the test still works there.
+Services.prefs.setBoolPref(kPrefName, true);
+
+registerCleanupFunction(function() {
+ Services.prefs.clearUserPref(kPrefName);
+});
+
+add_task(function* () {
+ let aTab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, kEmptyURI);
+ ok(!gFindBarInitialized, "findbar isn't initialized yet");
+
+ // Note: the use case here is when the user types directly in the findbar
+ // _before_ it's prefilled with a text selection in the page.
+
+ // So `yield BrowserTestUtils.sendChar()` can't be used here:
+ // - synthesizing a key in the browser won't actually send it to the
+ // findbar; the findbar isn't part of the browser content.
+ // - we need to _not_ wait for _startFindDeferred to be resolved; yielding
+ // a synthesized keypress on the browser implicitely happens after the
+ // browser has dispatched its return message with the prefill value for
+ // the findbar, which essentially nulls these tests.
+
+ let findBar = gFindBar;
+ is(findBar._findField.value, "", "findbar is empty");
+
+ // Test 1
+ // Any input in the findbar should erase a previous search.
+
+ findBar._findField.value = "xy";
+ findBar.startFind();
+ is(findBar._findField.value, "xy", "findbar should have xy initial query");
+ is(findBar._findField.mInputField,
+ document.activeElement,
+ "findbar is now focused");
+
+ EventUtils.sendChar("z", window);
+ is(findBar._findField.value, "z", "z erases xy");
+
+ findBar._findField.value = "";
+ ok(!findBar._findField.value, "erase findbar after first test");
+
+ // Test 2
+ // Prefilling the findbar should be ignored if a search has been run.
+
+ findBar.startFind();
+ ok(findBar._startFindDeferred, "prefilled value hasn't been fetched yet");
+ is(findBar._findField.mInputField,
+ document.activeElement,
+ "findbar is still focused");
+
+ EventUtils.sendChar("a", window);
+ EventUtils.sendChar("b", window);
+ is(findBar._findField.value, "ab", "initial ab typed in the findbar");
+
+ // This resolves _startFindDeferred if it's still pending; let's just skip
+ // over waiting for the browser's return message that should do this as it
+ // doesn't really matter.
+ findBar.onCurrentSelection("foo", true);
+ ok(!findBar._startFindDeferred, "prefilled value fetched");
+ is(findBar._findField.value, "ab", "ab kept instead of prefill value");
+
+ EventUtils.sendChar("c", window);
+ is(findBar._findField.value, "abc", "c is appended after ab");
+
+ // Clear the findField value to make the test run successfully
+ // for multiple runs in the same browser session.
+ findBar._findField.value = "";
+ yield BrowserTestUtils.removeTab(aTab);
+});