public void CloneableBackingCollection()
{
List <Cloneable> values = new List <Cloneable>(new Cloneable[] { new Cloneable(), new Cloneable(), new Cloneable() });
CopyOnReadEnumerable <Cloneable> enumerable = new CopyOnReadEnumerable <Cloneable>(values, values);
using (IEnumerator <Cloneable> enumerator = values.GetEnumerator())
{
foreach (Cloneable i in enumerable)
{
enumerator.MoveNext();
Assert.False(Object.ReferenceEquals(i, enumerator.Current)); // "Enumerator copied references."
}
}
}
public void NonCloneableBackingCollection()
{
List <int> values = new List <int>(new int[] { 1, 2, 3 });
CopyOnReadEnumerable <int> enumerable = new CopyOnReadEnumerable <int>(values, values);
using (IEnumerator <int> enumerator = values.GetEnumerator())
{
foreach (int i in enumerable)
{
enumerator.MoveNext();
Assert.Equal(i, enumerator.Current);
}
}
}
public void EnumeratesBackingCollection()
{
List <int> values = new List <int>(new int[] { 1, 2, 3 });
CopyOnReadEnumerable <int, string> enumerable = new CopyOnReadEnumerable <int, string>(values, values, i => i.ToString());
using (IEnumerator <int> enumerator = values.GetEnumerator())
{
foreach (string s in enumerable)
{
enumerator.MoveNext();
enumerator.Current.ToString().ShouldBe(s);
}
enumerator.MoveNext().ShouldBeFalse();
}
}
public void CopiesBackingCollection()
{
List <string> values = new List <string>(new string[] { "a", "b", "c" });
CopyOnReadEnumerable <string, string> enumerable = new CopyOnReadEnumerable <string, string>(values, values, s => s);
int expectedCount = values.Count;
var enumerator = enumerable.GetEnumerator();
// The list has been copied and adding to it has no effect on the enumerable.
values.Add("d");
int actualCount = 0;
while (enumerator.MoveNext())
{
actualCount++;
}
actualCount.ShouldBe(expectedCount);
}
