public void AddGroupInSource_ShouldAddGroup(int sourceInitialItemsCount, int expectedInsertionIndex)
{
NotifyCollectionChangedEventArgs collectionChangedEventArgs = null;
var collectionChangedEventsCount = 0;
var isCountPropertyChangedEventRaised = false;
var itemsList = new[] { 1, 2, 3 };
var source = new ObservableGroupedCollection <string, int>();
for (var i = 0; i < sourceInitialItemsCount; i++)
{
source.Add(new ObservableGroup <string, int>($"group {i}", Enumerable.Empty <int>()));
}
var readOnlyGroup = new ReadOnlyObservableGroupedCollection <string, int>(source);
((INotifyCollectionChanged)readOnlyGroup).CollectionChanged += (s, e) =>
{
collectionChangedEventArgs = e;
collectionChangedEventsCount++;
};
((INotifyPropertyChanged)readOnlyGroup).PropertyChanged += (s, e) => isCountPropertyChangedEventRaised = isCountPropertyChangedEventRaised || e.PropertyName == nameof(readOnlyGroup.Count);
source.Add(new ObservableGroup <string, int>("Add", itemsList));
var expectedReadOnlyGroupCount = sourceInitialItemsCount + 1;
readOnlyGroup.Should().HaveCount(expectedReadOnlyGroupCount);
readOnlyGroup.Count.Should().Be(expectedReadOnlyGroupCount);
readOnlyGroup.Last().Key.Should().Be("Add");
readOnlyGroup.Last().Should().BeEquivalentTo(itemsList, o => o.WithoutStrictOrdering());
isCountPropertyChangedEventRaised.Should().BeTrue();
collectionChangedEventArgs.Should().NotBeNull();
collectionChangedEventsCount.Should().Be(1);
IsAddEventValid(collectionChangedEventArgs, itemsList, expectedInsertionIndex).Should().BeTrue();
}
private void AddNewContact()
{
var newContact = new Person
{
Name = NewContact.Text.Trim(),
};
var groupName = GetGroupName(newContact);
var targetGroup = _contactsSource.FirstOrDefault(group => group.Key == groupName);
if (targetGroup is null)
{
_contactsSource.Add(new ObservableGroup <string, Person>(groupName, new[] { newContact }));
}
else
{
targetGroup.Add(newContact);
}
NewContact.Text = string.Empty;
}