Add m-esr52 at 52.6.0

1 files changed, 731 insertions, 0 deletions

diff --git a/netwerk/test/unit/test_backgroundfilesaver.js b/netwerk/test/unit/test_backgroundfilesaver.js
new file mode 100644
index 000000000..a545f596f
--- /dev/null
+++ b/netwerk/test/unit/test_backgroundfilesaver.js
@@ -0,0 +1,731 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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");
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                  "resource://gre/modules/Services.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({
+    uri: NetUtil.newURI(aFile),
+    loadUsingSystemPrincipal: true
+  }, 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;
+}
+
+var 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;
+});