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//! Enforce Rust ownership pragmatics for the underlying libxml2 objects
use libxml::parser::Parser;
use libxml::tree::set_node_rc_guard;
#[test]
fn ownership_guards() {
// Setup
let parser = Parser::default();
let doc_result = parser.parse_file("tests/resources/file01.xml");
assert!(doc_result.is_ok());
let doc = doc_result.unwrap();
let root = doc.get_root_element().unwrap();
let mut first_a = root.get_first_element_child().unwrap();
let first_b = root.get_first_element_child().unwrap();
assert_eq!(
first_a.get_attribute("attribute"),
Some(String::from("value"))
);
assert_eq!(
first_b.get_attribute("attribute"),
Some(String::from("value"))
);
// Setting an attribute will fail and return an error, as there are too many Rc references
// to the same node (Rc strong count of 3)
// see `Node::node_ptr_mut` for details
assert!(first_a.set_attribute("attribute", "newa").is_err());
assert_eq!(
first_a.get_attribute("attribute"),
Some(String::from("value"))
);
assert_eq!(
first_b.get_attribute("attribute"),
Some(String::from("value"))
);
// Try again with guard boosted, which allows the change
set_node_rc_guard(3);
// Setting an attribute will fail and return an error, as there are too many Rc references
// to the same node (Rc strong count of 3)
// see `Node::node_ptr_mut` for details
assert!(first_a.set_attribute("attribute", "newa").is_ok());
assert_eq!(
first_a.get_attribute("attribute"),
Some(String::from("newa"))
);
assert_eq!(
first_b.get_attribute("attribute"),
Some(String::from("newa"))
);
}
|
