public void TableLayoutColumnStyleCollection_IndexOf_Invoke_ReturnsExpected()
{
using var toolStrip = new ToolStrip { LayoutStyle = ToolStripLayoutStyle.Table };
TableLayoutSettings settings = Assert.IsType <TableLayoutSettings>(toolStrip.LayoutSettings);
TableLayoutColumnStyleCollection collection = settings.ColumnStyles;
var style = new ColumnStyle();
collection.Add(style);
Assert.Equal(0, collection.IndexOf(style));
Assert.Equal(-1, collection.IndexOf(new ColumnStyle()));
Assert.Equal(-1, collection.IndexOf(null));
}
