tests ~ increase test detail to diagnose MacOS hostname test failure

tests/by-util/test_hostname.rs

@@ -12,7 +12,9 @@ fn test_hostname() {
 
 #[test]
 fn test_hostname_ip() {
-    let result = new_ucmd!().arg("-i").succeeds();
+    let result = new_ucmd!().arg("-i").run();
+    println!("{:#?}", result);
+    assert!(result.success);
     assert!(!result.stdout.trim().is_empty());
 }
 

tests/common/util.rs

@@ -68,6 +68,7 @@ pub fn repeat_str(s: &str, n: u32) -> String {
 
 /// A command result is the outputs of a command (streams and status code)
 /// within a struct which has convenience assertion functions about those outputs
+#[derive(Debug)]
 pub struct CmdResult {
     //tmpd is used for convenience functions for asserts against fixtures
     tmpd: Option<Rc<TempDir>>,