### Question:
SettingsExporter { static void exportPreferences(Context context, OutputStream os, boolean includeGlobals, Set<String> accountUuids) throws SettingsImportExportException { try { XmlSerializer serializer = Xml.newSerializer(); serializer.setOutput(os, "UTF-8"); serializer.startDocument(null, Boolean.TRUE); serializer.setFeature("http: serializer.startTag(null, ROOT_ELEMENT); serializer.attribute(null, VERSION_ATTRIBUTE, Integer.toString(Settings.VERSION)); serializer.attribute(null, FILE_FORMAT_ATTRIBUTE, Integer.toString(FILE_FORMAT_VERSION)); Timber.i("Exporting preferences"); Preferences preferences = Preferences.getPreferences(context); Storage storage = preferences.getStorage(); Set<String> exportAccounts; if (accountUuids == null) { List<Account> accounts = preferences.getAccounts(); exportAccounts = new HashSet<>(); for (Account account : accounts) { exportAccounts.add(account.getUuid()); } } else { exportAccounts = accountUuids; } Map<String, Object> prefs = new TreeMap<String, Object>(storage.getAll()); if (includeGlobals) { serializer.startTag(null, GLOBAL_ELEMENT); writeSettings(serializer, prefs); serializer.endTag(null, GLOBAL_ELEMENT); } serializer.startTag(null, ACCOUNTS_ELEMENT); for (String accountUuid : exportAccounts) { Account account = preferences.getAccount(accountUuid); writeAccount(serializer, account, prefs); } serializer.endTag(null, ACCOUNTS_ELEMENT); serializer.endTag(null, ROOT_ELEMENT); serializer.endDocument(); serializer.flush(); } catch (Exception e) { throw new SettingsImportExportException(e.getLocalizedMessage(), e); } }  static String exportToFile(Context context, boolean includeGlobals, Set<String> accountUuids); static void exportToUri(Context context, boolean includeGlobals, Set<String> accountUuids, Uri uri); static String generateDatedExportFileName();  }### Answer:
@Test public void exportPreferences_producesXML() throws Exception { Document document = exportPreferences(false, Collections.<String>emptySet()); assertEquals("k9settings", document.getRootElement().getName()); }
@Test public void exportPreferences_setsVersionToLatest() throws Exception { Document document = exportPreferences(false, Collections.<String>emptySet()); assertEquals(Integer.toString(Settings.VERSION), document.getRootElement().getAttributeValue("version")); }
@Test public void exportPreferences_setsFormatTo1() throws Exception { Document document = exportPreferences(false, Collections.<String>emptySet()); assertEquals("1", document.getRootElement().getAttributeValue("format")); }
@Test public void exportPreferences_exportsGlobalSettingsWhenRequested() throws Exception { Document document = exportPreferences(true, Collections.<String>emptySet()); assertNotNull(document.getRootElement().getChild("global")); }
@Test public void exportPreferences_ignoresGlobalSettingsWhenRequested() throws Exception { Document document = exportPreferences(false, Collections.<String>emptySet()); assertNull(document.getRootElement().getChild("global")); }