public void TestRemoveNodes()
{
HNode node1 = new HText("node 1");
HNode node2 = new HElement("node2", "value2");
HNode node3 = new HText("node 3");
HNode node4 = new HElement("node4", "value4");
// Create parent
var elm = new HElement("test", node1, node2, node3, node4);
Assert.Same(node1, elm.FirstNode);
Assert.Same(node4, elm.LastNode);
Assert.Same(elm, node1.Parent);
Assert.Null(node1.PreviousNode);
Assert.Same(node2, node1.NextNode);
Assert.Same(elm, node2.Parent);
Assert.Same(node1, node2.PreviousNode);
Assert.Same(node3, node2.NextNode);
Assert.Same(elm, node3.Parent);
Assert.Same(node2, node3.PreviousNode);
Assert.Same(node4, node3.NextNode);
Assert.Same(elm, node4.Parent);
Assert.Same(node3, node4.PreviousNode);
Assert.Null(node4.NextNode);
// Remove all nodes
elm.RemoveNodes();
Assert.Null(elm.FirstNode);
Assert.Null(elm.LastNode);
Assert.Null(node1.Parent);
Assert.Null(node1.PreviousNode);
Assert.Null(node1.NextNode);
Assert.Null(node2.Parent);
Assert.Null(node2.PreviousNode);
Assert.Null(node2.NextNode);
Assert.Null(node3.Parent);
Assert.Null(node3.PreviousNode);
Assert.Null(node3.NextNode);
Assert.Null(node4.Parent);
Assert.Null(node4.PreviousNode);
Assert.Null(node4.NextNode);
Assert.Equal(0, elm.Nodes().Count());
// Create new element with string content
elm = new HElement("test", "content");
elm.RemoveNodes();
Assert.Null(elm.FirstNode);
Assert.Null(elm.LastNode);
Assert.Equal(0, elm.Nodes().Count());
// Check no exception
elm.RemoveNodes();
Assert.Equal(0, elm.Nodes().Count());
}