Implement ctrlaltdel (#31)

* Implement ctrlaltdel

* Add tests for `ctrlaltdel`

* Bless the unit tests on unsupported platforms

tests/by-util/test_ctrlaltdel.rs

@@ -0,0 +1,14 @@
+// This file is part of the uutils util-linux package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+// spell-checker:ignore (words) symdir somefakedir
+
+#[cfg(target_os = "linux")]
+use crate::common::util::TestScenario;
+
+#[test]
+#[cfg(target_os = "linux")]
+fn test_invalid_arg() {
+    new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
+}

tests/tests.rs

@@ -12,3 +12,7 @@ mod test_lscpu;
 #[cfg(feature = "mountpoint")]
 #[path = "by-util/test_mountpoint.rs"]
 mod test_mountpoint;
+
+#[cfg(feature = "ctrlaltdel")]
+#[path = "by-util/test_ctrlaltdel.rs"]
+mod test_ctrlaltdel;