public void CompositeEnumerator_SourceChanged()
{
// Verify that InvalidOperationExceptions are thrown when the when
// performing operations on the enumerator after the source has
// signalled that it has been modified.
List <int> source = new List <int>();
CompositeEnumerator <int> enumerator;
source.Add(0);
source.Add(1);
source.Add(2);
enumerator = new CompositeEnumerator <int>(source.GetEnumerator());
enumerator.OnSourceChanged();
ExtendedAssert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
enumerator = new CompositeEnumerator <int>(source.GetEnumerator());
enumerator.OnSourceChanged();
ExtendedAssert.Throws <InvalidOperationException>(() => { int i = enumerator.Current; });
enumerator = new CompositeEnumerator <int>(source.GetEnumerator());
enumerator.OnSourceChanged();
ExtendedAssert.Throws <InvalidOperationException>(() => { enumerator.Reset(); });
}
public void CompositeEnumerator_Reset()
{
List <int> source1 = new List <int>();
List <int> source2 = new List <int>();
List <int> source3 = new List <int>();
List <int> output = new List <int>();
CompositeEnumerator <int> enumerator;
source1.Add(0);
source1.Add(1);
source1.Add(2);
source2.Add(3);
source2.Add(4);
source2.Add(5);
source3.Add(6);
source3.Add(7);
source3.Add(8);
enumerator = new CompositeEnumerator <int>(source1.GetEnumerator(), source2.GetEnumerator(), source3.GetEnumerator());
while (enumerator.MoveNext())
{
output.Add(enumerator.Current);
}
Assert.AreEqual(9, output.Count);
Assert.AreEqual(0, output[0]);
Assert.AreEqual(1, output[1]);
Assert.AreEqual(2, output[2]);
Assert.AreEqual(3, output[3]);
Assert.AreEqual(4, output[4]);
Assert.AreEqual(5, output[5]);
Assert.AreEqual(6, output[6]);
Assert.AreEqual(7, output[7]);
Assert.AreEqual(8, output[8]);
// Verify that we can reset the enumerator and rewalk the collections.
output.Clear();
enumerator.Reset();
while (enumerator.MoveNext())
{
output.Add(enumerator.Current);
}
Assert.AreEqual(9, output.Count);
Assert.AreEqual(0, output[0]);
Assert.AreEqual(1, output[1]);
Assert.AreEqual(2, output[2]);
Assert.AreEqual(3, output[3]);
Assert.AreEqual(4, output[4]);
Assert.AreEqual(5, output[5]);
Assert.AreEqual(6, output[6]);
Assert.AreEqual(7, output[7]);
Assert.AreEqual(8, output[8]);
}
