usecrate::tree::*;/// Test whether a NodeIndex is a leaf or a parent
#[test]fntest_leaf_parent(){// Index 1 should be a parent node
let index =NodeIndex::from(1usize);assert!(!index.is_leaf());assert!(index.is_parent());// Index 2 should be a parent node
let index =NodeIndex::from(2usize);assert!(index.is_leaf());assert!(!index.is_parent());}