users: fix long_help text and clippy warning

src/uu/users/src/users.rs

@@ -6,19 +6,14 @@
 //  * For the full copyright and license information, please view the LICENSE
 //  * file that was distributed with this source code.
 
-/* last synced with: whoami (GNU coreutils) 8.22 */
-// Allow dead code here in order to keep all fields, constants here, for consistency.
-#![allow(dead_code)]
-
 #[macro_use]
 extern crate uucore;
 
-use uucore::utmpx::*;
-
 use clap::{App, Arg};
+use uucore::utmpx::{self, Utmpx};
 
-static ABOUT: &str = "Display who is currently logged in, according to FILE.";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
+static ABOUT: &str = "Print the user names of users currently logged in to the current host";
 
 static ARG_FILES: &str = "files";
 
@@ -26,13 +21,23 @@ fn get_usage() -> String {
     format!("{0} [FILE]", executable!())
 }
 
+fn get_long_usage() -> String {
+    format!(
+        "Output who is currently logged in according to FILE.
+If FILE is not specified, use {}.  /var/log/wtmp as FILE is common.",
+        utmpx::DEFAULT_FILE
+    )
+}
+
 pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
+    let after_help = get_long_usage();
 
     let matches = App::new(executable!())
         .version(VERSION)
         .about(ABOUT)
         .usage(&usage[..])
+        .after_help(&after_help[..])
         .arg(Arg::with_name(ARG_FILES).takes_value(true).max_values(1))
         .get_matches_from(args);
 
@@ -44,7 +49,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
     let filename = if !files.is_empty() {
         files[0].as_ref()
     } else {
-        DEFAULT_FILE
+        utmpx::DEFAULT_FILE
     };
 
     let mut users = Utmpx::iter_all_records()

tests/by-util/test_users.rs

@@ -1,27 +1,23 @@
 use crate::common::util::*;
-use std::env;
 
 #[test]
 fn test_users_noarg() {
     new_ucmd!().succeeds();
 }
+
 #[test]
+#[cfg(any(target_vendor = "apple", target_os = "linux"))]
 fn test_users_check_name() {
-    let result = TestScenario::new(util_name!()).ucmd_keepenv().succeeds();
+    #[cfg(target_os = "linux")]
+    let util_name = util_name!();
+    #[cfg(target_vendor = "apple")]
+    let util_name = format!("g{}", util_name!());
 
-    // Expectation: USER is often set
-    let key = "USER";
+    let expected = TestScenario::new(&util_name)
+        .cmd_keepenv(util_name)
+        .env("LANGUAGE", "C")
+        .succeeds()
+        .stdout_move_str();
 
-    match env::var(key) {
-        Err(e) => println!("Key {} isn't set. Found {}", &key, e),
-        Ok(username) =>
-        // Check if "users" contains the name of the user
-        {
-            println!("username found {}", &username);
-            // println!("result.stdout {}", &result.stdout);
-            if !result.stdout_str().is_empty() {
-                result.stdout_contains(&username);
-            }
-        }
-    }
+    new_ucmd!().succeeds().stdout_is(&expected);
 }