Unit testing Rx methods Timeout & Retry with moq

Earlier this week I was trying to unit test an asynchronous service (Foo) which used another asynchronous service (Bar) internally and ran into an issue trying to mock out the Bar service so that it would cause the retry & timeout schedules to fire.Bar is defined as follows, the implementation is irrelevant as it being mocked for the tests:.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: Consolas,...

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Observable.Timer throws ArgumentOutOfRangeException

We found this one out during testing in different time zones earlier this - if your app is going used in different time zones avoid using DateTime with Observable.Timer. In fact I guess the general message should be avoid DateTime all together in any apps use DateTimeOffset instead...This code works from here in London but when run in Hong Kong throws an exception:.csharpcode, .csharpcode pre { font-size: small; color: black; font-family:...

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Trying to be more functional with Rx

I realised this week I'm not being as functional when creating an Rx extension method as I should could be.This came out of a discussion I was having with @leeoades about a Pausable<T> extension we thought we needed at work. Lee had a solution and I thought I'd try to create one without looking for the answer on the t'internet..csharpcode, .csharpcode pre { font-size: small; color: black; font-family: Consolas, "Courier New", Courier,...

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Building a simple Portable Class Library - Simple.Rest

I wanted to see how easy it was to build a Portable Class Library, and the answer is very easy. What follows is my experience.First off create the project...Next choose the platforms you want to support, you can changes these later via the project settings page:At this point you're ready to start creating your masterpiece...For this demo I thought I would revisit the WP7Contrib. Last year I built as part of the WP7Contrib a set...

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Tricky continuous testing and self hosting WebAPI issue...

When using WebAPI inside a test fixture make sure you shutdown the HttpSelfHostServer instance correctly or your tests will more than likely fail when run from a continuous testing framework like nCrunch.See this post for info about using the self hosting version of WebAPI inside a test fixture.So my tests were running successfully when run inside Visual Studio from either the inbuilt runner or via Reshaper, but were failing when run...

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Exception handling for an async method

I've been unit testing a method which has a return type of Task<T> and I need to handle cases where  exceptions will be thrown.Should I use the Task approach or convert to an Rx observable stream?Task try-catch approach:or Rx declarative style:I know which one I prefer...

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Self hosting a web service inside a test fixture using WebAPI

I have a class which handles all the communication to any back-end RESTful service, it wraps up all the complexity of using HttpWebRequest and provides a simple API:.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: Consolas, "Courier New", Courier, Monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff;...

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Using GetRequestStreamAsync and GetResponseAsync in .Net 4.0 Portable Class Library

I've been building a small Portable Class Library and it makes use of the WebRequest class. I'm targeting .Net 4.0 (and above), Silverlight 5 and Windows App Store. I would target the phone as well but it doesn't support the TPL at the moment - WP8 is just around the corner:I wanted to use async method GetRequestStreamAsync  & GetResponseAsync but these aren't supported in .Net 4.0 and when creating a Portable Class Library...

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Testing time based observable in Rx is so easy...

If you've been doing Rx for a while it's very likely you're also be into testing with TDD. In which case you'll have come across testing observable timers but if not then what follows is how easy this is.So lets say I want to test the following method, it generates a 'tick' according to the time span parameter:.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: Consolas, "Courier New", Courier, Monospace; background-color:...

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