kill: add integration tests

tests/by-util/test_kill.rs

@@ -1 +1,126 @@
-// ToDO: add tests
+use crate::common::util::*;
+use regex::Regex;
+use std::os::unix::process::ExitStatusExt;
+use std::process::{Child, Command};
+
+// A child process the tests will try to kill.
+struct Target {
+    child: Child,
+    killed: bool,
+}
+
+impl Target {
+    // Creates a target that will naturally die after some time if not killed
+    // fast enough.
+    // This timeout avoids hanging failing tests.
+    fn new() -> Target {
+        Target {
+            child: Command::new("sleep")
+                .arg("30")
+                .spawn()
+                .expect("cannot spawn target"),
+            killed: false,
+        }
+    }
+
+    // Waits for the target to complete and returns the signal it received if any.
+    fn wait_for_signal(&mut self) -> Option<i32> {
+        let sig = self.child.wait().expect("cannot wait on target").signal();
+        self.killed = true;
+        sig
+    }
+
+    fn pid(&self) -> u32 {
+        self.child.id()
+    }
+}
+
+impl Drop for Target {
+    // Terminates this target to avoid littering test boxes with zombi processes
+    // when a test fails after creating a target but before killing it.
+    fn drop(&mut self) {
+        if !self.killed {
+            self.child.kill().expect("cannot kill target");
+        }
+    }
+}
+
+#[test]
+fn test_kill_list_all_signals() {
+    // Check for a few signals.  Do not try to be comprehensive.
+    new_ucmd!()
+        .arg("-l")
+        .succeeds()
+        .stdout_contains("KILL")
+        .stdout_contains("TERM")
+        .stdout_contains("HUP");
+}
+
+#[test]
+fn test_kill_list_all_signals_as_table() {
+    // Check for a few signals.  Do not try to be comprehensive.
+    new_ucmd!()
+        .arg("-t")
+        .succeeds()
+        .stdout_contains("KILL")
+        .stdout_contains("TERM")
+        .stdout_contains("HUP");
+}
+
+#[test]
+fn test_kill_list_one_signal_from_name() {
+    // Use SIGKILL because it is 9 on all unixes.
+    new_ucmd!()
+        .arg("-l")
+        .arg("KILL")
+        .succeeds()
+        .stdout_matches(&Regex::new("\\b9\\b").unwrap());
+}
+
+#[test]
+fn test_kill_set_bad_signal_name() {
+    new_ucmd!()
+        .arg("-s")
+        .arg("IAMNOTASIGNAL")
+        .fails()
+        .stderr_contains("unknown signal");
+}
+
+#[test]
+fn test_kill_with_default_signal() {
+    let mut target = Target::new();
+    new_ucmd!().arg(format!("{}", target.pid())).succeeds();
+    assert_eq!(target.wait_for_signal(), Some(libc::SIGTERM));
+}
+
+#[test]
+fn test_kill_with_signal_number_old_form() {
+    let mut target = Target::new();
+    new_ucmd!()
+        .arg("-9")
+        .arg(format!("{}", target.pid()))
+        .succeeds();
+    assert_eq!(target.wait_for_signal(), Some(9));
+}
+
+#[test]
+fn test_kill_with_signal_number_new_form() {
+    let mut target = Target::new();
+    new_ucmd!()
+        .arg("-s")
+        .arg("9")
+        .arg(format!("{}", target.pid()))
+        .succeeds();
+    assert_eq!(target.wait_for_signal(), Some(9));
+}
+
+#[test]
+fn test_kill_with_signal_name_new_form() {
+    let mut target = Target::new();
+    new_ucmd!()
+        .arg("-s")
+        .arg("KILL")
+        .arg(format!("{}", target.pid()))
+        .succeeds();
+    assert_eq!(target.wait_for_signal(), Some(libc::SIGKILL));
+}