Pagination-Kata

This Kata will help candidates learn about TDD development on green and brown fields. The .Net version is using NUnit & NSubstitute while the Java implementation is based on JUnit and mockito.

Table of Contents

1. Preparing your machine
2. Pagination Kata
3. Understanding solution
4. Licensing
5. Contacts
6. Credits

Preparing your machine

1.1. Java

• Download the package and unzip it. Next, import the project inside the Java folder as a Maven project inside Eclipse.

2.1. Installing Visual Studio

• Download visual studio installation from the link below and install it on your machine:

  https://www.visualstudio.com/en-us/products/visual-studio-community-vs.aspx

2.2. Adding Visual Studio extensions

• Because we will be using Nunit, it will be useful to add Nunit test adapter 3 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.

2.3. 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

Pagination Kata

You would like to paginate the items you are retrieving from the database before displaying them on a certain page. In order to do so, you need to return the first and last page numbers. The Previous and next page numbers of the required page.

The rules are:

• The database can return 0 or more items.
• First page number is 0 if there are no items to display.
• Last page number is 0 if there are no items to display.
• Previous page number is:
  • -1 if there are no items to display
  • 0 if previous page does not exist.
  • else required page - 1
• Next page number is:
  • -1 if there are no items to display
  • 0 if next page does not exist.
  • required page + 1

Examples: Given the items count is 7 And the number of items per page is 2 And the required page is 2 When i paginate Then the first page is 1 And the last page is 4 And the previous page is 1 And the next page is 3 And the items displayed in page are [3,4]