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I am constructing a prototype for robot using Test driven development ( C#, Console Application). First, I have created a test project and a class RobotTest. Here, I have written test methods to fail and to pass I construct the Robot class. Then, I have created a class RobertPrototype in which Robot class object is created to use methods in the Robot class. Along with that, I added some other methods (to parse input) in RobertPrototype.

I don't know if this is the way I have to follow while developing through TDD. Do I have to include all methods in Robot class itself ?

Please guide me. Thanks.

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Do I have to include all methods in Robot class itself ?

I don't understand the question. you already said your tests are in a separate project and that you are writing a separate client class RobotPrototype that uses the Robot class.

At this point it seems like a reasonable design.

I think you're confusing yourself by writing bits of all of your classes for each bit of "working" test that you write for some Robot class method. This is not the way to think about TDD. It DOES NOT mean write a failing test to create a Robot object, then write a shell of a Robot constructor, write a shell of a class that uses a robot, write a shell of a client that uses a RobotPrototype. Then write a failing test, then write an empty Robot method, write RobotPrototype code that uses that method, write client code that uses what the RobotPrototype uses. no, no, no.

Each class in your robot design will have it's own corresponding Test class. Each method in each class will have it's own corresponding method in it's corresponding test class. The TDD cycle is performed on a method-by-method basis.

Try this:

  • Focus on one class and it's corresponding test class. Clearly you need a Robot before anything else. Start with the Robot class.
  • Using the TDD cycle, write functional methods.
  • When you have enough Robot functionality to do something, then you can start writing some Robot-using code (RobotPrototype class).
  • The RobotPrototype class has it's own corresponding Test class. Each of it's methods will have a corresponding Test method. You should have written enough Robot functionality to complete any given RobotPrototype method. If not, stop. Go back to Robot and write functioning methods there.

Given the above, the points to take away are:

  • You wrote complete "core" methods first. Each method has working tests when you're done.

  • As write new code using existing code, you know that existing code works because it's been tested. And, your new code has it's own tests.

  • Thus your application is built up upon layers of tested code.

  • As you write and re-write, you constantly re-run your tests. And periodically make sure you rerun ALL of them. If a previously working test fails, well you know you have a problem and you know where to look first.

  • As much as practicable every class has a test class and every method has (at least one) test method.

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One implementation of TDD is Red-Green-Refactor. As you write tests (Red), you will need to add methods to Robot in order to pass(Green). The next step is to organize the code, possibly into other classes (Refactor). The initial code used to pass the test may be in a different class than your final code.

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In general you start by writing the skeleton of the class that you are willing to unit test and leaving all methods not implemented. Then you write the unit test about this class and all the methods that you are willing to test. Then you run the unit test which will fail because you haven't implemented the methods yet (you left them throw NotImplementedException) but at least your unit test can compile and execute. Then you go ahead and implement the methods and run the unit test which normally should pass. Then you refactor your code and when you run the unit test it should still pass. You move on to the next class and this process repeats.

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