public void ThrowsOnPairsInCaseOfOverflowSum()
{
var inputCollection = new List <int> {
1, 7, 2, int.MaxValue
};
var x = 4;
Assert.Catch <ArgumentException>(() => NumberTool.MatchSumOfPairs(inputCollection, x));
}
public void ReturnsEmptyCollectionIfInputCollectionIsEmpty()
{
var inputCollection = new List <int>();
var x = 20;
var outputCollection = NumberTool.MatchSumOfPairs(inputCollection, x);
CollectionAssert.IsEmpty(outputCollection);
}
public void ReturnsEmptyCollectionOfPairsIfNoMatchSum()
{
var inputCollection = new List <int> {
1, 7, 8, 15
};
var x = 20;
var outputCollection = NumberTool.MatchSumOfPairs(inputCollection, x);
CollectionAssert.IsEmpty(outputCollection);
}
public void ReturnsOnePairIfALotOfTheSameMatchSum()
{
var inputCollection = new List <int> {
1, 1, 1, 1, 1
};
var x = 2;
var outputCollection = NumberTool.MatchSumOfPairs(inputCollection, x);
CollectionAssert.IsNotEmpty(outputCollection);
Assert.IsTrue(outputCollection.Count() == 1);
Assert.AreEqual(x, outputCollection.Single().Value1 + outputCollection.Single().Value2);
}
public void ReturnsThreePairsIfThreeMatchSum()
{
var inputCollection = new List <int> {
1, 7, 2, 6, 4
};
var x = 8;
var outputCollection = NumberTool.MatchSumOfPairs(inputCollection, x);
CollectionAssert.IsNotEmpty(outputCollection);
Assert.IsTrue(outputCollection.Count() == 2);
Assert.IsTrue(outputCollection.All(p => p.Value1 + p.Value2 == x));
}
/// <summary>
/// Runs application
/// </summary>
internal void Run()
{
_userInteraction.DisplayInfo("This application displays pairs from an imput list. Sum of these pairs equal specific value X");
_userInteraction.DisplayInfo(string.Empty);
_userInteraction.DisplayInfo("Enter an input list of numbers (Int32) separated by space ' ':");
_userInteraction.DisplayInfo("Example: 1 3 5 6");
var line = _userInteraction.ReadUserInput();
if (string.IsNullOrEmpty(line))
{
_userInteraction.DisplayInfo("The line is empty.");
return;
}
var stringList = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
IEnumerable <int> numberList;
try
{
numberList = ConvertToIntArray(stringList);
}
catch (ArgumentException ex)
{
_userInteraction.DisplayInfo(ex.Message);
return;
}
_userInteraction.DisplayInfo("Enter X - sum of pair:");
line = _userInteraction.ReadUserInput();
if (string.IsNullOrEmpty(line))
{
_userInteraction.DisplayInfo("The line is empty.");
return;
}
int x;
if (!int.TryParse(line, out x))
{
_userInteraction.DisplayInfo("The X is invalid.");
return;
}
var pairs = NumberTool.MatchSumOfPairs(numberList, x);
DisplayPairs(pairs);
}
public void ThrowsNullExceptionIfInputCollectionIsNull()
{
var x = 8;
Assert.Catch <ArgumentNullException>(() => NumberTool.MatchSumOfPairs(null, x));
}
