public void RetainTargetCollection()
{
var tc = new ObservableCollection <int>();
var conn = new TransformerCollectionObserver <int, int>(Identity);
Assert.IsNull(conn.TargetCollection);
conn.TargetCollection = tc;
Assert.AreSame(tc, conn.TargetCollection);
}
public void NotCrashWhenSettingSourceCollection()
{
var sc = new ObservableCollection <int> {
1
};
var tc = new ObservableCollection <int>();
var conn = new TransformerCollectionObserver <int, int>(number => number + 1)
{
SourceCollection = sc,
TargetCollection = tc
};
Assert.AreSame(sc, conn.SourceCollection);
}
public void AddItemToTheTargetWhenAddedToTheSource()
{
var sc = new ObservableCollection <int>();
var tc = new ObservableCollection <int>();
// ReSharper disable once UnusedVariable => variable needed to correctly create the connector that will set up the MVVM components.
var conn = new TransformerCollectionObserver <int, int>(n => n)
{
SourceCollection = sc, TargetCollection = tc
};
sc.Add(1);
AssertCollectionsAreEqual(sc, tc);
}
public void NotRecalculateTargetCollectionIfTheSameTargetCollectionIsSet()
{
var sc = new ObservableCollection <int> {
1
};
var tc = new ObservableCollection <int>();
var conn = new TransformerCollectionObserver <int, int>(number => number + 1)
{
SourceCollection = sc,
TargetCollection = tc
};
tc.CollectionChanged +=
(obj, e) => { Assert.Fail("Target collection items changed when setting to the same collection!"); };
conn.TargetCollection = tc;
}
public void MoveTargetCollectionElementWhenSourceCollectionElementIsMoved()
{
var sc = new ObservableCollection <int> {
2, 1
};
var tc = new ObservableCollection <int>();
// ReSharper disable once UnusedVariable => variable needed to correctly create the connector that will set up the MVVM components.
var conn = new TransformerCollectionObserver <int, int>(Identity)
{
SourceCollection = sc,
TargetCollection = tc
};
AssertCollectionsAreEqual(sc, tc);
sc.Move(0, 1);
AssertCollectionsAreEqual(sc, tc);
}
public void ReplaceItemInTargetWhenReplacedInSourceCollection()
{
var sc = new ObservableCollection <int> {
1, 2, 3
};
var tc = new ObservableCollection <int>();
// ReSharper disable once UnusedVariable => variable needed to correctly create the connector that will set up the MVVM components.
var conn = new TransformerCollectionObserver <int, int>(Identity)
{
SourceCollection = sc,
TargetCollection = tc
};
AssertCollectionsAreEqual(sc, tc);
sc[0] = 4;
AssertCollectionsAreEqual(sc, tc);
}
public void ProperlyCopyTheObjectsWhenSourceCollectionIsChanged()
{
var sc1 = new ObservableCollection <int> {
1, 2, 3
};
var sc2 = new ObservableCollection <int> {
2, 3, 4
};
var tc = new ObservableCollection <int>();
var conn = new TransformerCollectionObserver <int, int>(Identity)
{
SourceCollection = sc1,
TargetCollection = tc
};
AssertCollectionsAreEqual(sc1, tc);
conn.SourceCollection = sc2;
AssertCollectionsAreEqual(sc2, tc);
}
