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Added negative test case for ReplaceRange when no items are replaced
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Andrew Hoefling committed May 2, 2019
1 parent 01b9496 commit 195edfa
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,23 @@ public void SkipCollectionChanged_ReplaceRange_Test()
Assert.Equal(1, collectionChangedCounter);
}

[Fact]
public void SkipCollectionChanged_ReplaceRange_Empty_Test()
{
int collectionChangedCounter = 0;
NonNullObservableCollection<string> collection = new NonNullObservableCollection<string>();
collection.Add("1");
collection.Add("2");
collection.Add("3");
collection.CollectionChanged += (s, e) => collectionChangedCounter++;

Assert.Throws<ArgumentNullException>(() => collection.ReplaceRange(0, 0, new string[0]));
Assert.Equal(0, collectionChangedCounter);

collection.Add("1");
Assert.Equal(1, collectionChangedCounter);
}

public class NonNullObservableCollection<T> : ObservableCollection<T>
{

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