static void Main()
{
string[] input = { "Apple", "Orange", "Pear", "Apple" };
ItemCounter itemCounter = new ItemCounter(input);
foreach (var item in itemCounter.distinctItems)
{
Console.WriteLine("{0}:{1}", item.Key, item.Value);
}
Console.WriteLine("Total distinct items: {0}", itemCounter.DistinctItems);
Console.WriteLine("\"Apple\" instances: {0}", itemCounter.GetCount("Apple"));
Console.WriteLine("\"Orange\" instances: {0}", itemCounter.GetCount("Orange"));
Console.WriteLine("\"Blank\" instances: {0}", itemCounter.GetCount("Blank"));
Console.WriteLine("\"null\" instances: {0}", itemCounter.GetCount(null));
Console.WriteLine("Contains key \"Lemon\": {0}", itemCounter.HasItem("Lemon"));
Console.WriteLine("Contains key \"null\": {0}", itemCounter.HasItem(null));
Console.ReadLine();
}
public void GetCount_WhenSpecifyingNullItem_ThrowsException()
{
// ARRANGE
var items = new[] { "Apple", "Apple" };
var counter = new ItemCounter <string>(items);
// ACT
TestDelegate testDelegate = delegate { counter.GetCount(null); };
// ASSERT
Assert.Throws <ArgumentNullException>(testDelegate);
}
public void GetCount_WhenSpecifyingNonExistingItem_ThrowsException()
{
// ARRANGE
var items = new[] { "Apple", "Apple" };
var counter = new ItemCounter <string>(items);
// ACT
TestDelegate testDelegate = delegate { counter.GetCount("Pear"); };
// ASSERT
Assert.Throws <InvalidOperationException>(testDelegate);
}
public void GetCount_AfterConstructionWithTwoDifferentItemsArray_IsOne()
{
// ARRANGE
var item1 = "Apple";
var item2 = "Banana";
var items = new[] { item1, item2 };
var counter = new ItemCounter <string>(items);
// ACT
var actualCount = counter.GetCount(item1);
// ASSERT
Assert.AreEqual(1, actualCount);
}
public void GetCount_AfterConstructionWithTwoSameItemsArray_IsTwo()
{
// ARRANGE
var item1 = "Apple";
var item2 = item1;
var items = new[] { item1, item2 };
var counter = new ItemCounter <string>(items);
// ACT
var actualCount = counter.GetCount(item1);
// ASSERT
Assert.AreEqual(2, actualCount);
}