test(uptime): Add a test (#1512)

tests/test_uptime.rs

@@ -0,0 +1,14 @@
+use common::util::*;
+
+#[test]
+fn test_uptime() {
+    let result = TestScenario::new(util_name!()).ucmd_keepenv().run();
+
+    println!("stdout = {}", result.stdout);
+    println!("stderr = {}", result.stderr);
+
+    assert!(result.success);
+    assert!(result.stdout.contains("load average:"));
+    assert!(result.stdout.contains(" up "));
+    // Don't check for users as it doesn't show in some CI
+}

tests/tests.rs

@@ -31,6 +31,7 @@ unix_only! {
     "stdbuf", test_stdbuf;
     "uname", test_uname;
     "unlink", test_unlink;
+    "uptime", test_uptime;
     "users", test_users;
     "who", test_who;
     // Be aware of the trailing semicolon after the last item