/FizzBuzzInterviewTask

Primary LanguageC#

Solution Overview

The FizzBuzz test solution contains three projects:

  1. FizzBuzzLib - where the business logic should be implemented, also contains interfaces
  2. FizzBuzzLib.Tests - an XUnit project for the main library
  3. FizzBuzzConsoleApp - Dotnet core console app

There are three interfaces defined:

  1. IFizzBuzz is the main one, implemented by default. It specifies one method that takes an int and returns a string.
  2. IFizzBuzzRange specifies a method that takes a start int and an end int, and returns an enumerable of strings.
  3. IFlexiFizzBuzz specifies that there should be a dictionary of int and strings, for use in the extended version

Main Task

The task is to implement the following requirements in a TDD manner:

  1. Method FizzBuzzifyAnInt should return string representation of input integer
  2. Where input is a multiple of 3, method should return "Fizz"
  3. Where input is a multiple of 5, method should return "Buzz"
  4. Where input is a multiple of 3 and 5 (e.g. 15), method should return "FizzBuzz"
  5. Another method should take two integers, "start" and "end", iterate over the range, and return an enumerable of FizzBuzzed strings (implement IFizzBuzzRange)
  6. The console app should print the FizzBuzz values for the numbers 0 to 100 (no XUnit test needed, just implement in console app)

The 2nd interviewer will work in a pair with the candidate, delivering the requirements and providing gently assistance as needed.

Extended Task

For certain candidates, we may ask them to additionally implement the following:

  1. FizzBuzz class to needs implement IFlexiFizzBuzz, with the dictionary defaulting to { {3, "Fizz"}, {5, "Buzz"} }
  2. Method FizzBuzzifyAnInt needs to be modified to use the dictionary - for each dictionary key that the input is a multiple of, return value should include the corresponding string value.

Test cases (1-10):

  • Dictionary contains FizzBuzz values. Sequence should be as expected.
  • Dictionary contains { {2, "Even"} }. Sequence should be 1, Even, 3, Even, 5, Even, 7, Even, 9, Even
  • Dictionary contains { {2, "Quack"}, {5, "Honk"} }. Sequence should be 1, Quack, 3, Quack, Honk, Quack, 7, Quack, 9, QuackHonk