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Elevator Kata BDD

This Kata will help candidates learn more about BDD development. It is based on .Net tools such as SpecFlow, NUnit, NSubstitute.

Table of Contents

  1. Preparing your machine
  2. Elevator Kata
  3. Understanding solution
  4. Licensing
  5. Contacts
  6. To do

Preparing your machine

1.1. Installing Visual Studio

1.2. Adding Visual Studio extensions

  • SpecFlow extension adds to visual studio the necessary BDD project templates:

    Open Visual Studio and go to Tools > Extensions and Updates. Search for SpecFlow on the online visual studio gallery and add it.

  • Because we will be using Nunit, it will be useful to add Nunit test adapter extension to visual studio in order to run tests from within the test explorer:

    Open Visual Studio and go to Tools > Extensions and Updates. Search for NUnit test adapter on the online gallery and add it.

1.3. Creating the test project

  • Finally, create a new library project and add reference to the following packages via Nuget Manager console:

    Open Visual Studio and go to Tools > NuGet package manager > NuGet package manager console and type these commands.

    Install-Package NUnit

    Install-Package NSubstitute

    Install-Package SpecFlow

Elevator Kata

You company is looking to build a software for their high tech elevator. You have been assigned to write the program based on specifications written by your colleagues. The expected behaviour of the elevator is as following:

  • The building has 6 floors and an underground level.
  • Elevator must open doors on every calling floor above it's current level if it's going up.
  • Elevator must open doors on every calling floor below it's current level if it's going down.
  • Elevator can not change his direction until all calling floors on it's way have been served.
  • Elevator can not work if its door is still open.
  • Elevator can not work if its total weight exceeds 300 kg

Examples:

Given the elevator is on the 0 floor
 And Matt wants to take elevator from 0 floor to 3 floor
 And Emily wants to take elevator from 2 floor to -1 floor	 	
When the elevator operates
Then the elevator opens doors respectively on 0, 2, 3, -1 floors

Given the elevator is on the 3 floor
 And Matt wants to take elevator from 2 floor to 0 floor
 And Emily wants to take elevator from 0 floor to 1 floor	 	
When the elevator operates
Then the elevator opens doors respectively on 2, 0, 1 floors

Given the elevator is on the 0 floor
 And Matt wants to take elevator from -1 floor to 2 floor
 And Emily wants to take elevator from 3 floor to 6 floor	 	
When the elevator operates
Then the elevator opens doors respectively on -1, 2, 3, 6 floors

Understanding the solution

  • UseElevatorV1: Create your first feature, generate the steps and check if the test runs ok.
  • UseElevatorV2: Write multiple scenarios and notice how the same steps can share their implementation. Change step scope if necessary.
  • UseElevatorV3: Use parameters to reduce the quantity of written code and avoid unecessary duplication
  • UseElevatorV4: Demonstrate how tables and its helpers can be used. Notice the background setup for the feature.
  • UseElevatorV5: Use the scenario outline to make a more clear concept and reduce code amount.
  • TBD: SpecFlow has hooks (methods can be executed before/after a scenario/feature)
  • TBD: DataSharing in specFlow can be done through 3 ways: Instance fields, scenario context and dependency injection

Licensing

Elevator KataBDD is licensed under a Creative Commons Attribution 3.0 Unported License.

ScreenShot

To view a copy of this license, visit [ http://creativecommons.org/licenses/by/3.0/deed.en_US ].

Contacts

Bilel Msekni (msekni.bilel@gmail.com)

To do

Do the BDD in other languages such as Java ...