public void Method_GetItemAtOrDefault_GetsDefault()
{
var slowComparer = new SlowComparer();
var itemList = new[] { 1, 2, 3, 4, 5 };
var item = slowComparer.GetItemAtOrDefault(itemList, 5); // Outside bounds
Assert.That(item, Is.EqualTo(default(int)), "Item was not default(int) when retrieving from collection using GetItemAtOrDefault.");
}
public void Collection_NotSlowEquals_Null()
{
var slowComparer = new SlowComparer();
var itemListA = new[] { 1, 2, 3, 4, 5 };
var result = slowComparer.Equals(itemListA, null);
Assert.IsFalse(result, "Slow Comparison failed to detect the difference between a collection and null.");
}
public void Method_GetItemAtOrDefault_GetsCorrectItem()
{
var slowComparer = new SlowComparer();
var itemList = new[] { 1, 2, 3, 4, 5 };
var item = slowComparer.GetItemAtOrDefault(itemList, 2); // Points to 3
Assert.That(item, Is.Not.Null, "Item was null when retrieving from collection using GetItemAtOrDefault.");
Assert.That(item, Is.EqualTo(3), $"Item was wrong when retrieving from collection using GetItemAtOrDefault - Expected: 3, Actual: {item}");
}
public void Collection_SlowEquals_Self()
{
var slowComparer = new SlowComparer();
var itemListA = new[] { 1, 2, 3, 4, 5 };
var result = slowComparer.Equals(itemListA, itemListA);
Assert.IsTrue(result, "Slow Comparison failed between two lists that are the same.");
}
public void Collection_NotSlowEquals_DifferentCollection()
{
var slowComparer = new SlowComparer();
var itemListA = new[] { 1, 2, 3, 4, 5 };
var itemListB = new[] { 6, 7, 8, 9, 0 };
var result = slowComparer.Equals(itemListA, itemListB);
Assert.IsFalse(result, "Slow Comparison failed to detect the difference between collections with differing items.");
}
public void Comparison_DoesNotThrowWhen_ItemTypesDiffer()
{
var slowComparer = new SlowComparer();
var itemListA = new[] { Tuple.Create(1), Tuple.Create(2), Tuple.Create(3) };
var itemListB = new[] { "1", "2", "3" };
Assert.DoesNotThrow(() =>
{
slowComparer.Equals <object>(itemListA, itemListB);
}, "Slow Comparison does not handle item lists of differing types.");
}
public void Comparison_DoesNotThrowWhen_CollectionSizesDiffer2()
{
var slowComparer = new SlowComparer();
var itemListA = new[] { 1, 2, 3, 4, 5 };
var itemListB = new[] { 5, 6, 7, 8, 9, 0 };
Assert.DoesNotThrow(() =>
{
slowComparer.Equals(itemListA, itemListB);
}, "Slow Comparison threw an exception when items differed in size.");
}
public static T GetItemAtOrDefault <T>(this SlowComparer comparer, IEnumerable <T> collection, int index)
{
var method = comparer
.GetPrivateMethod("GetItemAtOrDefault")
.MakeGenericMethod(typeof(T));
if (method == null)
{
throw new System.Exception();
}
return((T)method.Invoke(comparer, new object[] { collection, index }));
}
public void Comparison_AllItemsCompared_WhenAllEqual()
{
var slowComparer = new SlowComparer();
var itemListA = new[] { 1, 2, 3, 4, 5 };
var itemListB = new[] { 1, 2, 3, 4, 5 };
var comparisonCount = 0;
var counts = new[] { itemListA.Length, itemListB.Length };
var largestCount = counts.Max();
slowComparer.Compared += (sender, args) =>
{
comparisonCount++;
};
slowComparer.Equals(itemListA, itemListB);
Assert.That(comparisonCount, Is.EqualTo(largestCount), "Slow comparisons must compare all elements in the provided lists.");
}
