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TestJollyJumpers.cs
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/
TestJollyJumpers.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NUnit.Framework;
namespace ChallengeJollyJumpers.Test
{
[TestFixture]
public class TestJollyJumpers
{
private const string Delimiter = " ";
[Test]
public void IsJolly_GivenEmptyString_ShouldReturnFalse()
{
//---------------Set up test pack-------------------
var inputLine = "";
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var isJolly = IsJolly(inputLine);
//---------------Test Result -----------------------
Assert.IsFalse(isJolly);
}
[Test]
public void IsJolly_GivenSingleInteger_ShouldReturnFalse()
{
//---------------Set up test pack-------------------
var inputLine = "1";
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var isJolly = IsJolly(inputLine);
//---------------Test Result -----------------------
Assert.IsFalse(isJolly);
}
[Test]
public void IsJolly_GivenTwoIntegers_ShouldReturnTrue()
{
//---------------Set up test pack-------------------
var inputLine = "1 2";
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var isJolly = IsJolly(inputLine);
//---------------Test Result -----------------------
Assert.IsTrue(isJolly);
}
[Test]
public void IsJolly_GivenThreeIntegers_ShouldReturnFalse()
{
//---------------Set up test pack-------------------
var inputLine = "2 1 3";
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var isJolly = IsJolly(inputLine);
//---------------Test Result -----------------------
Assert.IsFalse(isJolly);
}
[Test]
public void IsJolly_Given5Integers_ShouldReturnTrue()
{
//---------------Set up test pack-------------------
var inputLine = "4 1 4 2 3";
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var isJolly = IsJolly(inputLine);
//---------------Test Result -----------------------
Assert.IsTrue(isJolly);
}
[Test]
public void IsJolly_Given6Integers_ShouldReturnFalse()
{
//---------------Set up test pack-------------------
var inputLine = "5 1 4 2 -1 6";
//---------------Assert Precondition----------------
//---------------Execute Test ----------------------
var isJolly = IsJolly(inputLine);
//---------------Test Result -----------------------
Assert.IsFalse(isJolly);
}
private bool IsJolly(string inputLine)
{
if (string.IsNullOrEmpty(inputLine))
{
return false;
}
var items = SplitInput(inputLine);
if (items.Count < 2)
{
return false;
}
var numberCount = GetNumberCount(items);
var sequence = GetNumberSequence(items);
if (sequence.Count() != numberCount)
{
return false;
}
var sequenceWithoutDuplicates = sequence.Distinct().ToList();
var sumOfSequence = GetSumOfDistinctSequence(numberCount - 1);
var sumOfAbsoluteValues = GetSumOfAbsoluteValues(sequenceWithoutDuplicates);
return sumOfSequence == sumOfAbsoluteValues;
}
private static int GetSumOfDistinctSequence(int numberCount)
{
return (numberCount*(numberCount + 1))/2;
}
private static int GetSumOfAbsoluteValues(List<string> sequenceWithoutDuplicates)
{
var sumOfAbsoluteValues = 0;
for (int i = 0; i < sequenceWithoutDuplicates.Count() - 1; i++)
{
var numberString1 = sequenceWithoutDuplicates[i];
var numberString2 = sequenceWithoutDuplicates[i + 1];
var number1 = Int32.Parse(numberString1);
var number2 = Int32.Parse(numberString2);
sumOfAbsoluteValues += Math.Abs(number1 - number2);
}
return sumOfAbsoluteValues;
}
private static List<string> GetNumberSequence(List<string> items)
{
return items.Skip(1).ToList();
}
private static int GetNumberCount(List<string> items)
{
return Int32.Parse(items[0]);
}
private static List<string> SplitInput(string inputLine)
{
return inputLine.Split(new[] {Delimiter}, StringSplitOptions.RemoveEmptyEntries).ToList();
}
}
}