Initial open source commit

test/unit/coffee/UrlFetcherTests.coffee

@@ -0,0 +1,74 @@
+SandboxedModule = require('sandboxed-module')
+sinon = require('sinon')
+require('chai').should()
+modulePath = require('path').join __dirname, '../../../app/js/UrlFetcher'
+EventEmitter = require("events").EventEmitter
+
+describe "UrlFetcher", ->
+	beforeEach ->
+		@callback = sinon.stub()
+		@url = "www.example.com/file"
+		@UrlFetcher = SandboxedModule.require modulePath, requires:
+			request: defaults: @defaults = sinon.stub().returns(@request = {})
+			fs: @fs = {}
+
+	it "should turn off the cookie jar in request", ->
+		@defaults.calledWith(jar: false)
+			.should.equal true
+		
+	describe "_pipeUrlToFile", ->
+		beforeEach ->
+			@path = "/path/to/file/on/disk"
+			@request.get = sinon.stub().returns(@urlStream = new EventEmitter)
+			@urlStream.pipe = sinon.stub()
+			@fs.createWriteStream = sinon.stub().returns(@fileStream = "write-stream-stub")
+			@UrlFetcher.pipeUrlToFile(@url, @path, @callback)
+
+		it "should request the URL", ->
+			@request.get
+				.calledWith(@url)
+				.should.equal true
+
+		it "should open the file for writing", ->
+			@fs.createWriteStream
+				.calledWith(@path)
+				.should.equal true
+
+		describe "successfully", ->
+			beforeEach ->
+				@res = statusCode: 200
+				@urlStream.emit "response", @res
+				@urlStream.emit "end"
+
+			it "should pipe the URL to the file", ->
+				@urlStream.pipe
+					.calledWith(@fileStream)
+					.should.equal true
+		
+			it "should call the callback", ->
+				@callback.called.should.equal true
+
+		describe "with non success status code", ->
+			beforeEach ->
+				@res = statusCode: 404
+				@urlStream.emit "response", @res
+				@urlStream.emit "end"
+
+			it "should call the callback with an error", ->
+				@callback
+					.calledWith(new Error("URL returned non-success status code: 404"))
+					.should.equal true
+
+		describe "with error", ->
+			beforeEach ->
+				@urlStream.emit "error", @error = new Error("something went wrong")
+
+			it "should call the callback with the error", ->
+				@callback
+					.calledWith(@error)
+					.should.equal true
+
+			it "should only call the callback once, even if end is called", ->
+				@urlStream.emit "end"
+				@callback.calledOnce.should.equal true
+