public void Test_MgcReplaceRange()
{
devDhMagic.MgcObservableCollection <int> collection = new devDhMagic.MgcObservableCollection <int>();
var toAdd = new[] { 3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9, 3, 2, 3 };
var toRemove = new[] { 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 0, 0 };
collection.MgcAddRange(toRemove);
collection.CollectionChanged += (s, e) =>
{
Assert.AreEqual(e.Action,
NotifyCollectionChangedAction.Reset,
"ReplaceRange didn't use Remove like requested.");
Assert.IsNull(e.OldItems, "OldItems should be null.");
Assert.IsNull(e.NewItems, "NewItems should be null.");
Assert.AreEqual(collection.Count, toAdd.Length, "Lengths are not the same");
for (var i = 0; i < toAdd.Length; i++)
{
if (collection[i] != (int)toAdd[i])
{
Assert.Fail("Expected and actual items don't match.");
}
}
};
collection.MgcReplaceRange(toAdd);
}
public void Test_ReplaceRange_should_NOT_mutate_source()
{
var sourceData = new List <int>(new[] { 1, 2, 3 });
devDhMagic.MgcObservableCollection <int> collection = new devDhMagic.MgcObservableCollection <int>(new[] { 1, 2, 3, 4, 5, 6 });
collection.MgcReplaceRange(sourceData);
Assert.IsTrue(sourceData.Count == 3, "source data was mutated");
}
public void Test_ReplaceRange_on_empty_collection_should_NOT_raise_collection_changes_when_empty()
{
devDhMagic.MgcObservableCollection <int> collection = new devDhMagic.MgcObservableCollection <int>();
var toAdd = new int[0];
collection.CollectionChanged += (s, e) =>
{
Assert.Fail("Collection changes should NOT be raised.");
};
collection.MgcReplaceRange(toAdd);
}
public void Test_ReplaceRange_on_non_empty_collection_should_always_raise_collection_changes()
{
devDhMagic.MgcObservableCollection <int> collection = new devDhMagic.MgcObservableCollection <int>(new[] { 1 });
var toAdd = new int[0];
var eventRaised = false;
collection.CollectionChanged += (s, e) =>
{
eventRaised = true;
};
collection.MgcReplaceRange(toAdd);
Assert.IsTrue(eventRaised, "Collection Reset should be raised.");
}
