The Tor Browser: comparison netwerk/test/unit/test_backgroundfilesaver.js

comparison: netwerk/test/unit/test_backgroundfilesaver.js

netwerk/test/unit/test_backgroundfilesaver.js

changeset 1: ca08bd8f51b2

equal deleted inserted replaced

--1:000000000000
+:cea54dc25ebf
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+* http://creativecommons.org/publicdomain/zero/1.0/ */
+/**
+* This file tests components that implement nsIBackgroundFileSaver.
+*/
+////////////////////////////////////////////////////////////////////////////////
+//// Globals
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
+"resource://gre/modules/FileUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
+"resource://gre/modules/NetUtil.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Promise",
+"resource://gre/modules/Promise.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Task",
+"resource://gre/modules/Task.jsm");
+const BackgroundFileSaverOutputStream = Components.Constructor(
+"@mozilla.org/network/background-file-saver;1?mode=outputstream",
+"nsIBackgroundFileSaver");
+const BackgroundFileSaverStreamListener = Components.Constructor(
+"@mozilla.org/network/background-file-saver;1?mode=streamlistener",
+"nsIBackgroundFileSaver");
+const StringInputStream = Components.Constructor(
+"@mozilla.org/io/string-input-stream;1",
+"nsIStringInputStream",
+"setData");
+const REQUEST_SUSPEND_AT = 1024 * 1024 * 4;
+const TEST_DATA_SHORT = "This test string is written to the file.";
+const TEST_FILE_NAME_1 = "test-backgroundfilesaver-1.txt";
+const TEST_FILE_NAME_2 = "test-backgroundfilesaver-2.txt";
+const TEST_FILE_NAME_3 = "test-backgroundfilesaver-3.txt";
+// A map of test data length to the expected SHA-256 hashes
+const EXPECTED_HASHES = {
+// No data
+0 : "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+// TEST_DATA_SHORT
+40 : "f37176b690e8744ee990a206c086cba54d1502aa2456c3b0c84ef6345d72a192",
+// TEST_DATA_SHORT + TEST_DATA_SHORT
+80 : "780c0e91f50bb7ec922cc11e16859e6d5df283c0d9470f61772e3d79f41eeb58",
+// TEST_DATA_LONG
+8388608 : "e3611a47714c42bdf326acfb2eb6ed9fa4cca65cb7d7be55217770a5bf5e7ff0",
+// TEST_DATA_LONG + TEST_DATA_LONG
+16777216 : "03a0db69a30140f307587ee746a539247c181bafd85b85c8516a3533c7d9ea1d"
+};
+const gTextDecoder = new TextDecoder();
+// Generate a long string of data in a moderately fast way.
+const TEST_256_CHARS = new Array(257).join("-");
+const DESIRED_LENGTH = REQUEST_SUSPEND_AT * 2;
+const TEST_DATA_LONG = new Array(1 + DESIRED_LENGTH / 256).join(TEST_256_CHARS);
+do_check_eq(TEST_DATA_LONG.length, DESIRED_LENGTH);
+/**
+* Returns a reference to a temporary file.  If the file is then created, it
+* will be removed when tests in this file finish.
+*/
+function getTempFile(aLeafName) {
+let file = FileUtils.getFile("TmpD", [aLeafName]);
+do_register_cleanup(function GTF_cleanup() {
+if (file.exists()) {
+file.remove(false);
+}
+});
+return file;
+}
+/**
+* Helper function for converting a binary blob to its hex equivalent.
+*
+* @param str
+*        String possibly containing non-printable chars.
+* @return A hex-encoded string.
+*/
+function toHex(str) {
+var hex = '';
+for (var i = 0; i < str.length; i++) {
+hex += ('0' + str.charCodeAt(i).toString(16)).slice(-2);
+}
+return hex;
+}
+/**
+* Ensures that the given file contents are equal to the given string.
+*
+* @param aFile
+*        nsIFile whose contents should be verified.
+* @param aExpectedContents
+*        String containing the octets that are expected in the file.
+*
+* @return {Promise}
+* @resolves When the operation completes.
+* @rejects Never.
+*/
+function promiseVerifyContents(aFile, aExpectedContents) {
+let deferred = Promise.defer();
+NetUtil.asyncFetch(aFile, function(aInputStream, aStatus) {
+do_check_true(Components.isSuccessCode(aStatus));
+let contents = NetUtil.readInputStreamToString(aInputStream,
+aInputStream.available());
+if (contents.length <= TEST_DATA_SHORT.length * 2) {
+do_check_eq(contents, aExpectedContents);
+} else {
+// Do not print the entire content string to the test log.
+do_check_eq(contents.length, aExpectedContents.length);
+do_check_true(contents == aExpectedContents);
+}
+deferred.resolve();
+});
+return deferred.promise;
+}
+/**
+* Waits for the given saver object to complete.
+*
+* @param aSaver
+*        The saver, with the output stream or a stream listener implementation.
+* @param aOnTargetChangeFn
+*        Optional callback invoked with the target file name when it changes.
+*
+* @return {Promise}
+* @resolves When onSaveComplete is called with a success code.
+* @rejects With an exception, if onSaveComplete is called with a failure code.
+*/
+function promiseSaverComplete(aSaver, aOnTargetChangeFn) {
+let deferred = Promise.defer();
+aSaver.observer = {
+onTargetChange: function BFSO_onSaveComplete(aSaver, aTarget)
+{
+if (aOnTargetChangeFn) {
+aOnTargetChangeFn(aTarget);
+}
+},
+onSaveComplete: function BFSO_onSaveComplete(aSaver, aStatus)
+{
+if (Components.isSuccessCode(aStatus)) {
+deferred.resolve();
+} else {
+deferred.reject(new Components.Exception("Saver failed.", aStatus));
+}
+},
+};
+return deferred.promise;
+}
+/**
+* Feeds a string to a BackgroundFileSaverOutputStream.
+*
+* @param aSourceString
+*        The source data to copy.
+* @param aSaverOutputStream
+*        The BackgroundFileSaverOutputStream to feed.
+* @param aCloseWhenDone
+*        If true, the output stream will be closed when the copy finishes.
+*
+* @return {Promise}
+* @resolves When the copy completes with a success code.
+* @rejects With an exception, if the copy fails.
+*/
+function promiseCopyToSaver(aSourceString, aSaverOutputStream, aCloseWhenDone) {
+let deferred = Promise.defer();
+let inputStream = new StringInputStream(aSourceString, aSourceString.length);
+let copier = Cc["@mozilla.org/network/async-stream-copier;1"]
+.createInstance(Ci.nsIAsyncStreamCopier);
+copier.init(inputStream, aSaverOutputStream, null, false, true, 0x8000, true,
+aCloseWhenDone);
+copier.asyncCopy({
+onStartRequest: function () { },
+onStopRequest: function (aRequest, aContext, aStatusCode)
+{
+if (Components.isSuccessCode(aStatusCode)) {
+deferred.resolve();
+} else {
+deferred.reject(new Components.Exception(aResult));
+}
+},
+}, null);
+return deferred.promise;
+}
+/**
+* Feeds a string to a BackgroundFileSaverStreamListener.
+*
+* @param aSourceString
+*        The source data to copy.
+* @param aSaverStreamListener
+*        The BackgroundFileSaverStreamListener to feed.
+* @param aCloseWhenDone
+*        If true, the output stream will be closed when the copy finishes.
+*
+* @return {Promise}
+* @resolves When the operation completes with a success code.
+* @rejects With an exception, if the operation fails.
+*/
+function promisePumpToSaver(aSourceString, aSaverStreamListener,
+aCloseWhenDone) {
+let deferred = Promise.defer();
+aSaverStreamListener.QueryInterface(Ci.nsIStreamListener);
+let inputStream = new StringInputStream(aSourceString, aSourceString.length);
+let pump = Cc["@mozilla.org/network/input-stream-pump;1"]
+.createInstance(Ci.nsIInputStreamPump);
+pump.init(inputStream, -1, -1, 0, 0, true);
+pump.asyncRead({
+onStartRequest: function PPTS_onStartRequest(aRequest, aContext)
+{
+aSaverStreamListener.onStartRequest(aRequest, aContext);
+},
+onStopRequest: function PPTS_onStopRequest(aRequest, aContext, aStatusCode)
+{
+aSaverStreamListener.onStopRequest(aRequest, aContext, aStatusCode);
+if (Components.isSuccessCode(aStatusCode)) {
+deferred.resolve();
+} else {
+deferred.reject(new Components.Exception(aResult));
+}
+},
+onDataAvailable: function PPTS_onDataAvailable(aRequest, aContext,
+aInputStream, aOffset,
+aCount)
+{
+aSaverStreamListener.onDataAvailable(aRequest, aContext, aInputStream,
+aOffset, aCount);
+},
+}, null);
+return deferred.promise;
+}
+let gStillRunning = true;
+////////////////////////////////////////////////////////////////////////////////
+//// Tests
+function run_test()
+{
+run_next_test();
+}
+add_task(function test_setup()
+{
+// Wait 10 minutes, that is half of the external xpcshell timeout.
+do_timeout(10 * 60 * 1000, function() {
+if (gStillRunning) {
+do_throw("Test timed out.");
+}
+})
+});
+add_task(function test_normal()
+{
+// This test demonstrates the most basic use case.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+// Create the object implementing the output stream.
+let saver = new BackgroundFileSaverOutputStream();
+// Set up callbacks for completion and target file name change.
+let receivedOnTargetChange = false;
+function onTargetChange(aTarget) {
+do_check_true(destFile.equals(aTarget));
+receivedOnTargetChange = true;
+}
+let completionPromise = promiseSaverComplete(saver, onTargetChange);
+// Set the target file.
+saver.setTarget(destFile, false);
+// Write some data and close the output stream.
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+// Indicate that we are ready to finish, and wait for a successful callback.
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Only after we receive the completion notification, we can also be sure that
+// we've received the target file name change notification before it.
+do_check_true(receivedOnTargetChange);
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_combinations()
+{
+let initialFile = getTempFile(TEST_FILE_NAME_1);
+let renamedFile = getTempFile(TEST_FILE_NAME_2);
+// Keep track of the current file.
+let currentFile = null;
+function onTargetChange(aTarget) {
+currentFile = null;
+do_print("Target file changed to: " + aTarget.leafName);
+currentFile = aTarget;
+}
+// Tests various combinations of events and behaviors for both the stream
+// listener and the output stream implementations.
+for (let testFlags = 0; testFlags < 32; testFlags++) {
+let keepPartialOnFailure = !!(testFlags & 1);
+let renameAtSomePoint = !!(testFlags & 2);
+let cancelAtSomePoint = !!(testFlags & 4);
+let useStreamListener = !!(testFlags & 8);
+let useLongData = !!(testFlags & 16);
+let startTime = Date.now();
+do_print("Starting keepPartialOnFailure = " + keepPartialOnFailure +
+", renameAtSomePoint = " + renameAtSomePoint +
+", cancelAtSomePoint = " + cancelAtSomePoint +
+", useStreamListener = " + useStreamListener +
+", useLongData = " + useLongData);
+// Create the object and register the observers.
+currentFile = null;
+let saver = useStreamListener
+? new BackgroundFileSaverStreamListener()
+: new BackgroundFileSaverOutputStream();
+saver.enableSha256();
+let completionPromise = promiseSaverComplete(saver, onTargetChange);
+// Start feeding the first chunk of data to the saver.  In case we are using
+// the stream listener, we only write one chunk.
+let testData = useLongData ? TEST_DATA_LONG : TEST_DATA_SHORT;
+let feedPromise = useStreamListener
+? promisePumpToSaver(testData + testData, saver)
+: promiseCopyToSaver(testData, saver, false);
+// Set a target output file.
+saver.setTarget(initialFile, keepPartialOnFailure);
+// Wait for the first chunk of data to be copied.
+yield feedPromise;
+if (renameAtSomePoint) {
+saver.setTarget(renamedFile, keepPartialOnFailure);
+}
+if (cancelAtSomePoint) {
+saver.finish(Cr.NS_ERROR_FAILURE);
+}
+// Feed the second chunk of data to the saver.
+if (!useStreamListener) {
+yield promiseCopyToSaver(testData, saver, true);
+}
+// Wait for completion, and ensure we succeeded or failed as expected.
+if (!cancelAtSomePoint) {
+saver.finish(Cr.NS_OK);
+}
+try {
+yield completionPromise;
+if (cancelAtSomePoint) {
+do_throw("Failure expected.");
+}
+} catch (ex if cancelAtSomePoint && ex.result == Cr.NS_ERROR_FAILURE) { }
+if (!cancelAtSomePoint) {
+// In this case, the file must exist.
+do_check_true(currentFile.exists());
+let expectedContents = testData + testData;
+yield promiseVerifyContents(currentFile, expectedContents);
+do_check_eq(EXPECTED_HASHES[expectedContents.length],
+toHex(saver.sha256Hash));
+currentFile.remove(false);
+// If the target was really renamed, the old file should not exist.
+if (renamedFile.equals(currentFile)) {
+do_check_false(initialFile.exists());
+}
+} else if (!keepPartialOnFailure) {
+// In this case, the file must not exist.
+do_check_false(initialFile.exists());
+do_check_false(renamedFile.exists());
+} else {
+// In this case, the file may or may not exist, because canceling can
+// interrupt the asynchronous operation at any point, even before the file
+// has been created for the first time.
+if (initialFile.exists()) {
+initialFile.remove(false);
+}
+if (renamedFile.exists()) {
+renamedFile.remove(false);
+}
+}
+do_print("Test case completed in " + (Date.now() - startTime) + " ms.");
+}
+});
+add_task(function test_setTarget_after_close_stream()
+{
+// This test checks the case where we close the output stream before we call
+// the setTarget method.  All the data should be buffered and written anyway.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+// Test the case where the file does not already exists first, then the case
+// where the file already exists.
+for (let i = 0; i < 2; i++) {
+let saver = new BackgroundFileSaverOutputStream();
+saver.enableSha256();
+let completionPromise = promiseSaverComplete(saver);
+// Copy some data to the output stream of the file saver.  This data must
+// be shorter than the internal component's pipe buffer for the test to
+// succeed, because otherwise the test would block waiting for the write to
+// complete.
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+// Set the target file and wait for the output to finish.
+saver.setTarget(destFile, false);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results.
+yield promiseVerifyContents(destFile, TEST_DATA_SHORT);
+do_check_eq(EXPECTED_HASHES[TEST_DATA_SHORT.length],
+toHex(saver.sha256Hash));
+}
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_setTarget_fast()
+{
+// This test checks a fast rename of the target file.
+let destFile1 = getTempFile(TEST_FILE_NAME_1);
+let destFile2 = getTempFile(TEST_FILE_NAME_2);
+let saver = new BackgroundFileSaverOutputStream();
+let completionPromise = promiseSaverComplete(saver);
+// Set the initial name after the stream is closed, then rename immediately.
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+saver.setTarget(destFile1, false);
+saver.setTarget(destFile2, false);
+// Wait for all the operations to complete.
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results and clean up.
+do_check_false(destFile1.exists());
+yield promiseVerifyContents(destFile2, TEST_DATA_SHORT);
+destFile2.remove(false);
+});
+add_task(function test_setTarget_multiple()
+{
+// This test checks multiple renames of the target file.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+let saver = new BackgroundFileSaverOutputStream();
+let completionPromise = promiseSaverComplete(saver);
+// Rename both before and after the stream is closed.
+saver.setTarget(getTempFile(TEST_FILE_NAME_2), false);
+saver.setTarget(getTempFile(TEST_FILE_NAME_3), false);
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+saver.setTarget(getTempFile(TEST_FILE_NAME_2), false);
+saver.setTarget(destFile, false);
+// Wait for all the operations to complete.
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results and clean up.
+do_check_false(getTempFile(TEST_FILE_NAME_2).exists());
+do_check_false(getTempFile(TEST_FILE_NAME_3).exists());
+yield promiseVerifyContents(destFile, TEST_DATA_SHORT);
+destFile.remove(false);
+});
+add_task(function test_enableAppend()
+{
+// This test checks append mode with hashing disabled.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+// Test the case where the file does not already exists first, then the case
+// where the file already exists.
+for (let i = 0; i < 2; i++) {
+let saver = new BackgroundFileSaverOutputStream();
+saver.enableAppend();
+let completionPromise = promiseSaverComplete(saver);
+saver.setTarget(destFile, false);
+yield promiseCopyToSaver(TEST_DATA_LONG, saver, true);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results.
+let expectedContents = (i == 0 ? TEST_DATA_LONG
+: TEST_DATA_LONG + TEST_DATA_LONG);
+yield promiseVerifyContents(destFile, expectedContents);
+}
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_enableAppend_setTarget_fast()
+{
+// This test checks a fast rename of the target file in append mode.
+let destFile1 = getTempFile(TEST_FILE_NAME_1);
+let destFile2 = getTempFile(TEST_FILE_NAME_2);
+// Test the case where the file does not already exists first, then the case
+// where the file already exists.
+for (let i = 0; i < 2; i++) {
+let saver = new BackgroundFileSaverOutputStream();
+saver.enableAppend();
+let completionPromise = promiseSaverComplete(saver);
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+// The first time, we start appending to the first file and rename to the
+// second file.  The second time, we start appending to the second file,
+// that was created the first time, and rename back to the first file.
+let firstFile = (i == 0) ? destFile1 : destFile2;
+let secondFile = (i == 0) ? destFile2 : destFile1;
+saver.setTarget(firstFile, false);
+saver.setTarget(secondFile, false);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results.
+do_check_false(firstFile.exists());
+let expectedContents = (i == 0 ? TEST_DATA_SHORT
+: TEST_DATA_SHORT + TEST_DATA_SHORT);
+yield promiseVerifyContents(secondFile, expectedContents);
+}
+// Clean up.
+destFile1.remove(false);
+});
+add_task(function test_enableAppend_hash()
+{
+// This test checks append mode, also verifying that the computed hash
+// includes the contents of the existing data.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+// Test the case where the file does not already exists first, then the case
+// where the file already exists.
+for (let i = 0; i < 2; i++) {
+let saver = new BackgroundFileSaverOutputStream();
+saver.enableAppend();
+saver.enableSha256();
+let completionPromise = promiseSaverComplete(saver);
+saver.setTarget(destFile, false);
+yield promiseCopyToSaver(TEST_DATA_LONG, saver, true);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results.
+let expectedContents = (i == 0 ? TEST_DATA_LONG
+: TEST_DATA_LONG + TEST_DATA_LONG);
+yield promiseVerifyContents(destFile, expectedContents);
+do_check_eq(EXPECTED_HASHES[expectedContents.length],
+toHex(saver.sha256Hash));
+}
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_finish_only()
+{
+// This test checks creating the object and doing nothing.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+let saver = new BackgroundFileSaverOutputStream();
+function onTargetChange(aTarget) {
+do_throw("Should not receive the onTargetChange notification.");
+}
+let completionPromise = promiseSaverComplete(saver, onTargetChange);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+});
+add_task(function test_empty()
+{
+// This test checks we still create an empty file when no data is fed.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+let saver = new BackgroundFileSaverOutputStream();
+let completionPromise = promiseSaverComplete(saver);
+saver.setTarget(destFile, false);
+yield promiseCopyToSaver("", saver, true);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results.
+do_check_true(destFile.exists());
+do_check_eq(destFile.fileSize, 0);
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_empty_hash()
+{
+// This test checks the hash of an empty file, both in normal and append mode.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+// Test normal mode first, then append mode.
+for (let i = 0; i < 2; i++) {
+let saver = new BackgroundFileSaverOutputStream();
+if (i == 1) {
+saver.enableAppend();
+}
+saver.enableSha256();
+let completionPromise = promiseSaverComplete(saver);
+saver.setTarget(destFile, false);
+yield promiseCopyToSaver("", saver, true);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+// Verify results.
+do_check_eq(destFile.fileSize, 0);
+do_check_eq(EXPECTED_HASHES[0], toHex(saver.sha256Hash));
+}
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_invalid_hash()
+{
+let saver = new BackgroundFileSaverStreamListener();
+let completionPromise = promiseSaverComplete(saver);
+// We shouldn't be able to get the hash if hashing hasn't been enabled
+try {
+let hash = saver.sha256Hash;
+do_throw("Shouldn't be able to get hash if hashing not enabled");
+} catch (ex if ex.result == Cr.NS_ERROR_NOT_AVAILABLE) { }
+// Enable hashing, but don't feed any data to saver
+saver.enableSha256();
+let destFile = getTempFile(TEST_FILE_NAME_1);
+saver.setTarget(destFile, false);
+// We don't wait on promiseSaverComplete, so the hash getter can run before
+// or after onSaveComplete is called. However, the expected behavior is the
+// same in both cases since the hash is only valid when the save completes
+// successfully.
+saver.finish(Cr.NS_ERROR_FAILURE);
+try {
+let hash = saver.sha256Hash;
+do_throw("Shouldn't be able to get hash if save did not succeed");
+} catch (ex if ex.result == Cr.NS_ERROR_NOT_AVAILABLE) { }
+// Wait for completion so that the worker thread finishes dealing with the
+// target file. We expect it to fail.
+try {
+yield completionPromise;
+do_throw("completionPromise should throw");
+} catch (ex if ex.result == Cr.NS_ERROR_FAILURE) { }
+});
+add_task(function test_signature()
+{
+// Check that we get a signature if the saver is finished.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+let saver = new BackgroundFileSaverOutputStream();
+let completionPromise = promiseSaverComplete(saver);
+try {
+let signatureInfo = saver.signatureInfo;
+do_throw("Can't get signature if saver is not complete");
+} catch (ex if ex.result == Cr.NS_ERROR_NOT_AVAILABLE) { }
+saver.enableSignatureInfo();
+saver.setTarget(destFile, false);
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+yield promiseVerifyContents(destFile, TEST_DATA_SHORT);
+// signatureInfo is an empty nsIArray
+do_check_eq(0, saver.signatureInfo.length);
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_signature_not_enabled()
+{
+// Check that we get a signature if the saver is finished on Windows.
+let destFile = getTempFile(TEST_FILE_NAME_1);
+let saver = new BackgroundFileSaverOutputStream();
+let completionPromise = promiseSaverComplete(saver);
+saver.setTarget(destFile, false);
+yield promiseCopyToSaver(TEST_DATA_SHORT, saver, true);
+saver.finish(Cr.NS_OK);
+yield completionPromise;
+try {
+let signatureInfo = saver.signatureInfo;
+do_throw("Can't get signature if not enabled");
+} catch (ex if ex.result == Cr.NS_ERROR_NOT_AVAILABLE) { }
+// Clean up.
+destFile.remove(false);
+});
+add_task(function test_teardown()
+{
+gStillRunning = false;
+});