Working version of fully-async log rolling file appender - tests need fixing though

test/bufferedStream.js

@@ -0,0 +1,130 @@
+var vows = require('vows')
+, assert = require('assert')
+, events = require('events')
+, BufferedWriteStream = require('../lib/streams').BufferedWriteStream;
+
+function FakeStream() {
+    this.writes = [];
+    this.canWrite = false;
+    this.callbacks = {};
+}
+
+FakeStream.prototype.on = function(event, callback) {
+    this.callbacks[event] = callback;
+}
+
+FakeStream.prototype.write = function(data, encoding) {
+    assert.equal("utf8", encoding);
+    this.writes.push(data);
+    return this.canWrite;
+}
+
+FakeStream.prototype.emit = function(event, payload) {
+    this.callbacks[event](payload);
+}
+
+FakeStream.prototype.block = function() {
+    this.canWrite = false;
+}
+
+FakeStream.prototype.unblock = function() {
+    this.canWrite = true;
+    this.emit("drain");
+}
+
+vows.describe('BufferedWriteStream').addBatch({
+    'stream': {
+        topic: new BufferedWriteStream(new FakeStream()),
+        'should take a stream as an argument and return a stream': function(stream) {
+            assert.instanceOf(stream, events.EventEmitter);
+        }
+    },
+    'before stream is open': {
+        topic: function() {
+            var fakeStream = new FakeStream(),
+            stream = new BufferedWriteStream(fakeStream);
+            stream.write("Some data", "utf8");
+            stream.write("Some more data", "utf8");
+            return fakeStream.writes;
+        },
+        'should buffer writes': function(writes) {
+            assert.equal(writes.length, 0);
+        }
+    },
+    'when stream is open': {
+        topic: function() {
+            var fakeStream = new FakeStream(),
+            stream = new BufferedWriteStream(fakeStream);
+            stream.write("Some data", "utf8");
+            fakeStream.canWrite = true;
+            fakeStream.emit("open");
+            stream.write("Some more data", "utf8");
+            return fakeStream.writes;
+        },
+        'should write data to stream from before stream was open': function (writes) {
+            assert.equal(writes[0], "Some data");
+        },
+        'should write data to stream from after stream was open': function (writes) {
+            assert.equal(writes[1], "Some more data");
+        }
+    },
+    'when stream is blocked': {
+        topic: function() {
+            var fakeStream = new FakeStream(),
+            stream = new BufferedWriteStream(fakeStream);
+            fakeStream.emit("open");
+            fakeStream.block();
+            stream.write("will not know it is blocked until first write", "utf8");
+            stream.write("so this one will be buffered, but not the previous one", "utf8");
+            return fakeStream.writes;
+        },
+        'should buffer writes': function (writes) {
+            assert.equal(writes.length, 1);
+            assert.equal(writes[0], "will not know it is blocked until first write");
+        }
+    },
+    'when stream is unblocked': {
+        topic: function() {
+            var fakeStream = new FakeStream(),
+            stream = new BufferedWriteStream(fakeStream);
+            fakeStream.emit("open");
+            fakeStream.block();
+            stream.write("will not know it is blocked until first write", "utf8");
+            stream.write("so this one will be buffered, but not the previous one", "utf8");
+            fakeStream.unblock();
+            return fakeStream.writes;
+        },
+        'should send buffered data': function (writes) {
+            assert.equal(writes.length, 2);
+            assert.equal(writes[1], "so this one will be buffered, but not the previous one");
+        }
+    },
+    'when stream is closed': {
+        topic: function() {
+            var fakeStream = new FakeStream(),
+            stream = new BufferedWriteStream(fakeStream);
+            fakeStream.emit("open");
+            fakeStream.block();
+            stream.write("first write to notice stream is blocked", "utf8");
+            stream.write("data while blocked", "utf8");
+            stream.end();
+            return fakeStream.writes;
+        },
+        'should send any buffered writes to the stream': function (writes) {
+            assert.equal(writes.length, 2);
+            assert.equal(writes[1], "data while blocked");
+        }
+    },
+    'when stream errors': {
+        topic: function() {
+            var fakeStream = new FakeStream(),
+            stream = new BufferedWriteStream(fakeStream);
+            stream.on("error", this.callback);
+            fakeStream.emit("error", "oh noes!");
+        },
+        'should emit error': function(err, value) {
+            assert.equal(err, "oh noes!");
+        }
+    }
+
+}).exportTo(module);