gecko-dev/xpcom/tests/unit/test_storagestream.js
Jim Blandy 7e20285e70 Bug 914753: Make Emacs file variable header lines correct, or at least consistent. DONTBUILD r=ehsan
The -*- file variable lines -*- establish per-file settings that Emacs will
pick up. This patch makes the following changes to those lines (and touches
nothing else):

 - Never set the buffer's mode.

   Years ago, Emacs did not have a good JavaScript mode, so it made sense
   to use Java or C++ mode in .js files. However, Emacs has had js-mode for
   years now; it's perfectly serviceable, and is available and enabled by
   default in all major Emacs packagings.

   Selecting a mode in the -*- file variable line -*- is almost always the
   wrong thing to do anyway. It overrides Emacs's default choice, which is
   (now) reasonable; and even worse, it overrides settings the user might
   have made in their '.emacs' file for that file extension. It's only
   useful when there's something specific about that particular file that
   makes a particular mode appropriate.

 - Correctly propagate settings that establish the correct indentation
   level for this file: c-basic-offset and js2-basic-offset should be
   js-indent-level. Whatever value they're given should be preserved;
   different parts of our tree use different indentation styles.

 - We don't use tabs in Mozilla JS code. Always set indent-tabs-mode: nil.
   Remove tab-width: settings, at least in files that don't contain tab
   characters.

 - Remove js2-mode settings that belong in the user's .emacs file, like
   js2-skip-preprocessor-directives.
2014-06-24 22:12:07 -07:00

163 lines
3.7 KiB
JavaScript

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
function run_test()
{
test1();
test2();
test3();
test4();
}
/**
* Checks that getting an input stream from a storage stream which has never had
* anything written to it throws a not-initialized exception.
*/
function test1()
{
var ss = Cc["@mozilla.org/storagestream;1"]
.createInstance(Ci.nsIStorageStream);
ss.init(1024, 1024, null);
var out = ss.getOutputStream(0);
var inp2 = ss.newInputStream(0);
do_check_eq(inp2.available(), 0);
do_check_true(inp2.isNonBlocking());
var sis =
Cc["@mozilla.org/scriptableinputstream;1"]
.createInstance(Ci.nsIScriptableInputStream);
sis.init(inp2);
var threw = false;
try {
sis.read(1);
} catch (ex if ex.result == Cr.NS_BASE_STREAM_WOULD_BLOCK) {
threw = true;
}
do_check_true(threw);
}
/**
* Checks that getting an input stream from a storage stream to which 0 bytes of
* data have been explicitly written doesn't throw an exception.
*/
function test2()
{
var ss = Cc["@mozilla.org/storagestream;1"]
.createInstance(Ci.nsIStorageStream);
ss.init(1024, 1024, null);
var out = ss.getOutputStream(0);
out.write("", 0);
try
{
var inp2 = ss.newInputStream(0);
}
catch (e)
{
do_throw("shouldn't throw exception when new input stream created");
}
}
/**
* Checks that reading any non-zero amount of data from a storage stream
* which has had 0 bytes written to it explicitly works correctly.
*/
function test3()
{
var ss = Cc["@mozilla.org/storagestream;1"]
.createInstance(Ci.nsIStorageStream);
ss.init(1024, 1024, null);
var out = ss.getOutputStream(0);
out.write("", 0);
try
{
var inp = ss.newInputStream(0);
}
catch (e)
{
do_throw("newInputStream(0) shouldn't throw if write() is called: " + e);
}
do_check_true(inp.isNonBlocking(), "next test expects a non-blocking stream");
try
{
var threw = false;
var bis = BIS(inp);
var dummy = bis.readByteArray(5);
}
catch (e)
{
if (e.result != Cr.NS_BASE_STREAM_WOULD_BLOCK)
do_throw("wrong error thrown: " + e);
threw = true;
}
do_check_true(threw,
"should have thrown (nsStorageInputStream is nonblocking)");
}
/**
* Basic functionality test for storagestream: write data to it, get an input
* stream, and read the data back to see that it matches.
*/
function test4()
{
var bytes = [65, 66, 67, 68, 69, 70, 71, 72, 73, 74];
var ss = Cc["@mozilla.org/storagestream;1"]
.createInstance(Ci.nsIStorageStream);
ss.init(1024, 1024, null);
var outStream = ss.getOutputStream(0);
var bos = Cc["@mozilla.org/binaryoutputstream;1"]
.createInstance(Ci.nsIBinaryOutputStream);
bos.setOutputStream(outStream);
bos.writeByteArray(bytes, bytes.length);
bos.close();
var inp = ss.newInputStream(0);
var bis = BIS(inp);
var count = 0;
while (count < bytes.length)
{
var data = bis.read8(1);
do_check_eq(data, bytes[count++]);
}
var threw = false;
try
{
data = bis.read8(1);
}
catch (e)
{
if (e.result != Cr.NS_ERROR_FAILURE)
do_throw("wrong error thrown: " + e);
threw = true;
}
if (!threw)
do_throw("should have thrown but instead returned: '" + data + "'");
}
function BIS(input)
{
var bis = Cc["@mozilla.org/binaryinputstream;1"]
.createInstance(Ci.nsIBinaryInputStream);
bis.setInputStream(input);
return bis;
}