public void TestRemoveAttributes()
{
var attr1 = new HAttribute("attr1", "value1");
var attr2 = new HAttribute("attr2", "value2");
var attr3 = new HAttribute("attr3", "value3");
var attr4 = new HAttribute("attr4", "value4");
// Create parent
var elm = new HElement("test", attr1, attr2, attr3, attr4);
Assert.Same(attr1, elm.FirstAttribute);
Assert.Same(attr4, elm.LastAttribute);
Assert.Same(elm, attr1.Parent);
Assert.Null(attr1.PreviousAttribute);
Assert.Same(attr2, attr1.NextAttribute);
Assert.Same(elm, attr2.Parent);
Assert.Same(attr1, attr2.PreviousAttribute);
Assert.Same(attr3, attr2.NextAttribute);
Assert.Same(elm, attr3.Parent);
Assert.Same(attr2, attr3.PreviousAttribute);
Assert.Same(attr4, attr3.NextAttribute);
Assert.Same(elm, attr4.Parent);
Assert.Same(attr3, attr4.PreviousAttribute);
Assert.Null(attr4.NextAttribute);
// Remove all attributes
elm.RemoveAttributes();
Assert.Null(elm.FirstAttribute);
Assert.Null(elm.LastAttribute);
Assert.Null(attr1.Parent);
Assert.Null(attr1.PreviousAttribute);
Assert.Null(attr1.NextAttribute);
Assert.Null(attr2.Parent);
Assert.Null(attr2.PreviousAttribute);
Assert.Null(attr2.NextAttribute);
Assert.Null(attr3.Parent);
Assert.Null(attr3.PreviousAttribute);
Assert.Null(attr3.NextAttribute);
Assert.Null(attr4.Parent);
Assert.Null(attr4.PreviousAttribute);
Assert.Null(attr4.NextAttribute);
Assert.Equal(0, elm.Attributes().Count());
// Check no exception
elm.RemoveAttributes();
Assert.Equal(0, elm.Attributes().Count());
}