1 files changed, 169 insertions, 0 deletions
diff --git a/addon-sdk/source/test/test-byte-streams.js b/addon-sdk/source/test/test-byte-streams.js
new file mode 100644
index 000000000..7d45130aa
--- /dev/null
+++ b/addon-sdk/source/test/test-byte-streams.js
@@ -0,0 +1,169 @@
+/* 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(() => 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(() => 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);