uucore: Update tests for realtime signals.

Author: aweinstock

src/uucore/src/lib/features/signals.rs

@@ -410,7 +410,7 @@ pub fn signal_by_name_or_value(signal_name_or_value: &str) -> Option<usize> {
 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
 /// Parses signals of the form RTMIN(+[0-9]\+)?|RTMAX(-[0-9]\+)?
 fn try_parse_sigrt(signal_name: &str) -> Option<usize> {
-    if crate::os::is_wsl() {
+    if realtime_signal_bounds().is_none() {
         return None;
     }
     if let Some(rest) = signal_name.strip_prefix("RTMIN") {

tests/by-util/test_kill.rs

@@ -497,7 +497,7 @@ fn test_kill_signal_only_no_pid() {
 #[test]
 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn test_kill_with_signal_sigrt() {
-    if !uucore::os::is_wsl() {
+    if realtime_signal_bounds().is_some() {
         for signal in &["SIGRTMIN", "SIGRTMIN+1", "SIGRTMAX", "SIGRTMAX-1"] {
             let target = Target::new();
             new_ucmd!()

tests/by-util/test_timeout.rs

@@ -290,7 +290,7 @@ fn test_foreground_signal0_kill_after() {
 #[test]
 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
 fn test_timeout_sigrt() {
-    if !uucore::os::is_wsl() {
+    if realtime_signal_bounds().is_some() {
         new_ucmd!()
             .args(&["-s", "SIGRTMIN", "0.1", "sleep", "2"])
             .succeeds();