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diff --git a/toolkit/components/downloads/test/unit/test_Downloads.js b/toolkit/components/downloads/test/unit/test_Downloads.js
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+/* -*- 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/ */
+
+/**
+ * Tests the functions located directly in the "Downloads" object.
+ */
+
+"use strict";
+
+// Tests
+
+/**
+ * Tests that the createDownload function exists and can be called.  More
+ * detailed tests are implemented separately for the DownloadCore module.
+ */
+add_task(async function test_createDownload() {
+  // Creates a simple Download object without starting the download.
+  await Downloads.createDownload({
+    source: { url: "about:blank" },
+    target: { path: getTempFile(TEST_TARGET_FILE_NAME).path },
+    saver: { type: "copy" },
+  });
+});
+
+/**
+ * Tests createDownload for private download.
+ */
+add_task(async function test_createDownload_private() {
+  let download = await Downloads.createDownload({
+    source: { url: "about:blank", isPrivate: true },
+    target: { path: getTempFile(TEST_TARGET_FILE_NAME).path },
+    saver: { type: "copy" },
+  });
+  Assert.ok(download.source.isPrivate);
+});
+
+/**
+ * Tests createDownload for normal (public) download.
+ */
+add_task(async function test_createDownload_public() {
+  let tempPath = getTempFile(TEST_TARGET_FILE_NAME).path;
+  let download = await Downloads.createDownload({
+    source: { url: "about:blank", isPrivate: false },
+    target: { path: tempPath },
+    saver: { type: "copy" },
+  });
+  Assert.ok(!download.source.isPrivate);
+
+  download = await Downloads.createDownload({
+    source: { url: "about:blank" },
+    target: { path: tempPath },
+    saver: { type: "copy" },
+  });
+  Assert.ok(!download.source.isPrivate);
+});
+
+/**
+ * Tests "fetch" with nsIURI and nsIFile as arguments.
+ */
+add_task(async function test_fetch_uri_file_arguments() {
+  let targetFile = getTempFile(TEST_TARGET_FILE_NAME);
+  await Downloads.fetch(NetUtil.newURI(httpUrl("source.txt")), targetFile);
+  await promiseVerifyContents(targetFile.path, TEST_DATA_SHORT);
+});
+
+/**
+ * Tests "fetch" with DownloadSource and DownloadTarget as arguments.
+ */
+add_task(async function test_fetch_object_arguments() {
+  let targetPath = getTempFile(TEST_TARGET_FILE_NAME).path;
+  await Downloads.fetch({ url: httpUrl("source.txt") }, { path: targetPath });
+  await promiseVerifyContents(targetPath, TEST_DATA_SHORT);
+});
+
+/**
+ * Tests "fetch" with string arguments.
+ */
+add_task(async function test_fetch_string_arguments() {
+  let targetPath = getTempFile(TEST_TARGET_FILE_NAME).path;
+  await Downloads.fetch(httpUrl("source.txt"), targetPath);
+  await promiseVerifyContents(targetPath, TEST_DATA_SHORT);
+
+  targetPath = getTempFile(TEST_TARGET_FILE_NAME).path;
+  await Downloads.fetch(httpUrl("source.txt"), targetPath);
+  await promiseVerifyContents(targetPath, TEST_DATA_SHORT);
+});
+
+/**
+ * Tests that the getList function returns the same list when called multiple
+ * times with the same argument, but returns different lists when called with
+ * different arguments.  More detailed tests are implemented separately for the
+ * DownloadList module.
+ */
+add_task(async function test_getList() {
+  let publicListOne = await Downloads.getList(Downloads.PUBLIC);
+  let privateListOne = await Downloads.getList(Downloads.PRIVATE);
+
+  let publicListTwo = await Downloads.getList(Downloads.PUBLIC);
+  let privateListTwo = await Downloads.getList(Downloads.PRIVATE);
+
+  Assert.equal(publicListOne, publicListTwo);
+  Assert.equal(privateListOne, privateListTwo);
+
+  Assert.notEqual(publicListOne, privateListOne);
+});
+
+/**
+ * Tests that the getSummary function returns the same summary when called
+ * multiple times with the same argument, but returns different summaries when
+ * called with different arguments.  More detailed tests are implemented
+ * separately for the DownloadSummary object in the DownloadList module.
+ */
+add_task(async function test_getSummary() {
+  let publicSummaryOne = await Downloads.getSummary(Downloads.PUBLIC);
+  let privateSummaryOne = await Downloads.getSummary(Downloads.PRIVATE);
+
+  let publicSummaryTwo = await Downloads.getSummary(Downloads.PUBLIC);
+  let privateSummaryTwo = await Downloads.getSummary(Downloads.PRIVATE);
+
+  Assert.equal(publicSummaryOne, publicSummaryTwo);
+  Assert.equal(privateSummaryOne, privateSummaryTwo);
+
+  Assert.notEqual(publicSummaryOne, privateSummaryOne);
+});
+
+/**
+ * Tests that the getSystemDownloadsDirectory returns a non-empty download
+ * directory string.
+ */
+add_task(async function test_getSystemDownloadsDirectory() {
+  let downloadDir = await Downloads.getSystemDownloadsDirectory();
+  Assert.notEqual(downloadDir, "");
+});
+
+/**
+ * Tests that the getPreferredDownloadsDirectory returns a non-empty download
+ * directory string.
+ */
+add_task(async function test_getPreferredDownloadsDirectory() {
+  let downloadDir = await Downloads.getPreferredDownloadsDirectory();
+  Assert.notEqual(downloadDir, "");
+});
+
+/**
+ * Tests that the getTemporaryDownloadsDirectory returns a non-empty download
+ * directory string.
+ */
+add_task(async function test_getTemporaryDownloadsDirectory() {
+  let downloadDir = await Downloads.getTemporaryDownloadsDirectory();
+  Assert.notEqual(downloadDir, "");
+});