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Getting Started with Test Driven Development in C# (tutorial)

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Introduction

Test Driven Development (TDD) is highly recommended approach to software development. In TDD, we first write unit tests, generate skeleton code so that the solution builds. Obviously all tests will fail initially since we have no functional code in place as yet!

Taking Flight

We now need to write the functional code so that all tests pass. This does sound simple but possibly we will have to refactor our code iteratively + in most situations, we will also need to mock certain services so that our tests execute without actually say touch the databases, etc.

Lets see a sample console app to understand the steps involved:

  1. Create a console app:

  2. Add Unit Test project:


    You will see the Test Project in the Solution Explorer:


    Note: don't forget to add a reference to the C# project in your Test project!

  3. Add the Test method and write code to essentially fail the target method. Ideally, it should cover all possible flows / scenarios (we can see the test passing below because we already had the functional code in place but you will get this test as failed initially):

  4. Add functional code:

  5. Run the tests!

Code Sample

You can get sample code for this article from  http://code.msdn.microsoft.com/Getting-Started-with-Test-18a7624b