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

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

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

branch: TOR_BUG_9701
changeset 10: ac0c01689b40

equal deleted inserted replaced

--1:000000000000
+:37759d367b5a
+/* 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 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 text-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 = file.open(fname, "w");
+assert.ok(!stream.closed, "stream.closed after open should be false");
+stream.write(str);
+stream.close();
+assert.ok(stream.closed, "stream.closed after close should be true");
+assert.throws(function () stream.close(),
+STREAM_CLOSED_ERROR,
+"stream.close after already closed should raise error");
+assert.throws(function () stream.write("This shouldn't be written!"),
+STREAM_CLOSED_ERROR,
+"stream.write after close should raise error");
+// ... and read it.
+stream = file.open(fname);
+assert.ok(!stream.closed, "stream.closed after open should be false");
+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.closed after close should be true");
+assert.throws(function () stream.close(),
+STREAM_CLOSED_ERROR,
+"stream.close after already closed should raise error");
+assert.throws(function () stream.read(),
+STREAM_CLOSED_ERROR,
+"stream.read after close should raise error");
+// Write a big string many times the size of the stream's buffer and read it.
+// Since it comes after the previous test, this also ensures that the file is
+// truncated when it's opened for writing.
+str = "";
+let bufLen = BUFFER_BYTE_LEN;
+let fileSize = bufLen * 10;
+for (let i = 0; i < fileSize; i++)
+str += i % 10;
+stream = file.open(fname, "w");
+stream.write(str);
+stream.close();
+stream = file.open(fname);
+assert.equal(stream.read(), str,
+"stream.read should return string written");
+stream.close();
+// The same, but write and read in chunks.
+stream = file.open(fname, "w");
+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 = file.open(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");
+// Read the same file, passing in strange numbers of bytes to read.
+stream = file.open(fname);
+assert.equal(stream.read(fileSize * 100), str,
+"stream.read with big byte length should return string " +
+"written");
+stream.close();
+stream = file.open(fname);
+assert.equal(stream.read(0), "",
+"string.read with zero byte length should return empty " +
+"string");
+stream.close();
+stream = file.open(fname);
+assert.equal(stream.read(-1), "",
+"string.read with negative byte length should return " +
+"empty string");
+stream.close();
+file.remove(fname);
+};
+exports.testWriteAsync = function (assert, done) {
+let fname = dataFileFilename();
+let str = "exports.testWriteAsync data!";
+let stream = file.open(fname, "w");
+assert.ok(!stream.closed, "stream.closed after open should be false");
+// Write.
+stream.writeAsync(str, function (err) {
+assert.equal(this, stream, "|this| should be the stream object");
+assert.equal(err, undefined,
+"stream.writeAsync should not cause error");
+assert.ok(stream.closed, "stream.closed after write should be true");
+assert.throws(function () stream.close(),
+STREAM_CLOSED_ERROR,
+"stream.close after already closed should raise error");
+assert.throws(function () stream.writeAsync("This shouldn't work!"),
+STREAM_CLOSED_ERROR,
+"stream.writeAsync after close should raise error");
+// Read.
+stream = file.open(fname, "r");
+assert.ok(!stream.closed, "stream.closed after open should be false");
+let readStr = stream.read();
+assert.equal(readStr, str,
+"string.read should yield string written");
+stream.close();
+file.remove(fname);
+done();
+});
+};
+exports.testUnload = function (assert) {
+let loader = Loader(module);
+let file = loader.require("sdk/io/file");
+let filename = dataFileFilename("temp");
+let stream = file.open(filename, "w");
+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-text-streams-data");
+}
+require('sdk/test').run(exports);