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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections;
using System.ComponentModel;
namespace System.Windows.Forms.Tests;
// NB: doesn't require thread affinity
public class GridItemCollectionTests
{
[Fact]
public void GridItemCollection_Empty_Get_ReturnsExpected()
{
GridItemCollection collection = GridItemCollection.Empty;
Assert.Same(collection, GridItemCollection.Empty);
Assert.Empty(collection);
}
[Fact]
public void GridItemCollection_ICollection_GetProperties_ReturnsExpected()
{
ICollection collection = GridItemCollection.Empty;
Assert.Equal(0, collection.Count);
Assert.False(collection.IsSynchronized);
Assert.Same(collection, collection.SyncRoot);
}
[Theory]
[InlineData(-1)]
[InlineData(0)]
[InlineData(1)]
public void GridItemCollection_CopyTo_Empty_Nop(int index)
{
ICollection collection = GridItemCollection.Empty;
object[] array = [1, 2, 3];
collection.CopyTo(array, index);
Assert.Equal([1, 2, 3], array);
}
[Fact]
public void GridItemCollection_GetEnumerator_Empty_ReturnsExpected()
{
GridItemCollection collection = GridItemCollection.Empty;
IEnumerator enumerator = collection.GetEnumerator();
Assert.False(enumerator.MoveNext());
}
[Theory]
[StringWithNullData]
public void GridItemCollection_Item_GetEmpty_ReturnsNull(string label)
{
GridItemCollection collection = GridItemCollection.Empty;
Assert.Null(collection[label]);
}
private class SubGridItem : GridItem
{
public override GridItemCollection GridItems => GridItemCollection.Empty;
public override GridItemType GridItemType => GridItemType.Property;
public override string Label => "label";
public override GridItem Parent => null;
public override PropertyDescriptor PropertyDescriptor => null;
public override object Value => "value";
public override bool Select() => true;
}
}
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