Function intspan::get_descendent
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All direct descendents of the Node, not a recursive fetchall
let path = std::path::PathBuf::from("tests/nwr/");
let conn = intspan::connect_txdb(&path).unwrap();
// Synechococcus phage S
let descendents = intspan::get_descendent(&conn, 375032).unwrap();
assert_eq!(descendents.get(0).unwrap().tax_id, 375033);
assert_eq!(descendents.get(0).unwrap().rank, "no rank");
assert_eq!(descendents.len(), 34);