The Tor Browser: comparison addon-sdk/source/test/test-byte-streams.js

comparison: addon-sdk/source/test/test-byte-streams.js

addon-sdk/source/test/test-byte-streams.js

branch: TOR_BUG_9701
changeset 10: ac0c01689b40

equal deleted inserted replaced

--1:000000000000
+:4ac5bf2c9649
+/* 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 byteStreams = require("sdk/io/byte-streams");
+const file = require("sdk/io/file");
+const { pathFor } = require("sdk/system");
+const { Loader } = require("sdk/test/loader");
+const STREAM_CLOSED_ERROR = new RegExp("The stream is closed and cannot be used.");
+// This should match the constant of the same name in byte-streams.js.
+const BUFFER_BYTE_LEN = 0x8000;
+exports.testWriteRead = function (assert) {
+let fname = dataFileFilename();
+// Write a small string less than the stream's buffer size...
+let str = "exports.testWriteRead data!";
+let stream = open(assert, fname, true);
+assert.ok(!stream.closed, "stream.closed after open should be false");
+stream.write(str);
+stream.close();
+assert.ok(stream.closed, "Stream should be closed after stream.close");
+assert.throws(function () stream.write("This shouldn't be written!"),
+STREAM_CLOSED_ERROR,
+"stream.write after close should raise error");
+// ... and read it.
+stream = open(assert, fname);
+assert.equal(stream.read(), str,
+"stream.read should return string written");
+assert.equal(stream.read(), "",
+"stream.read at EOS should return empty string");
+stream.close();
+assert.ok(stream.closed, "Stream should be closed after stream.close");
+assert.throws(function () stream.read(),
+STREAM_CLOSED_ERROR,
+"stream.read after close should raise error");
+file.remove(fname);
+};
+// Write a big string many times the size of the stream's buffer and read it.
+exports.testWriteReadBig = function (assert) {
+let str = "";
+let bufLen = BUFFER_BYTE_LEN;
+let fileSize = bufLen * 10;
+for (let i = 0; i < fileSize; i++)
+str += i % 10;
+let fname = dataFileFilename();
+let stream = open(assert, fname, true);
+stream.write(str);
+stream.close();
+stream = open(assert, fname);
+assert.equal(stream.read(), str,
+"stream.read should return string written");
+stream.close();
+file.remove(fname);
+};
+// The same, but write and read in chunks.
+exports.testWriteReadChunks = function (assert) {
+let str = "";
+let bufLen = BUFFER_BYTE_LEN;
+let fileSize = bufLen * 10;
+for (let i = 0; i < fileSize; i++)
+str += i % 10;
+let fname = dataFileFilename();
+let stream = open(assert, fname, true);
+let i = 0;
+while (i < str.length) {
+// Use a chunk length that spans buffers.
+let chunk = str.substr(i, bufLen + 1);
+stream.write(chunk);
+i += bufLen + 1;
+}
+stream.close();
+stream = open(assert, fname);
+let readStr = "";
+bufLen = BUFFER_BYTE_LEN;
+let readLen = bufLen + 1;
+do {
+var frag = stream.read(readLen);
+readStr += frag;
+} while (frag);
+stream.close();
+assert.equal(readStr, str,
+"stream.write and read in chunks should work as expected");
+file.remove(fname);
+};
+exports.testReadLengths = function (assert) {
+let fname = dataFileFilename();
+let str = "exports.testReadLengths data!";
+let stream = open(assert, fname, true);
+stream.write(str);
+stream.close();
+stream = open(assert, fname);
+assert.equal(stream.read(str.length * 1000), str,
+"stream.read with big byte length should return string " +
+"written");
+stream.close();
+stream = open(assert, fname);
+assert.equal(stream.read(0), "",
+"string.read with zero byte length should return empty " +
+"string");
+stream.close();
+stream = open(assert, fname);
+assert.equal(stream.read(-1), "",
+"string.read with negative byte length should return " +
+"empty string");
+stream.close();
+file.remove(fname);
+};
+exports.testTruncate = function (assert) {
+let fname = dataFileFilename();
+let str = "exports.testReadLengths data!";
+let stream = open(assert, fname, true);
+stream.write(str);
+stream.close();
+stream = open(assert, fname);
+assert.equal(stream.read(), str,
+"stream.read should return string written");
+stream.close();
+stream = open(assert, fname, true);
+stream.close();
+stream = open(assert, fname);
+assert.equal(stream.read(), "",
+"stream.read after truncate should be empty");
+stream.close();
+file.remove(fname);
+};
+exports.testUnload = function (assert) {
+let loader = Loader(module);
+let file = loader.require("sdk/io/file");
+let filename = dataFileFilename("temp-b");
+let stream = file.open(filename, "wb");
+loader.unload();
+assert.ok(stream.closed, "Stream should be closed after module unload");
+};
+// Returns the name of a file that should be used to test writing and reading.
+function dataFileFilename() {
+return file.join(pathFor("ProfD"), "test-byte-streams-data");
+}
+// Opens and returns the given file and ensures it's of the correct class.
+function open(assert, filename, forWriting) {
+let stream = file.open(filename, forWriting ? "wb" : "b");
+let klass = forWriting ? "ByteWriter" : "ByteReader";
+assert.ok(stream instanceof byteStreams[klass],
+"Opened stream should be a " + klass);
+return stream;
+}
+require('sdk/test').run(exports);