lsmem: Impl lsmem

tests/by-util/test_lsmem.rs

@@ -2,3 +2,10 @@
 //
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
+
+use crate::common::util::TestScenario;
+
+#[test]
+fn test_invalid_arg() {
+    new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
+}

tests/tests.rs

@@ -9,6 +9,10 @@ mod common;
 #[path = "by-util/test_lscpu.rs"]
 mod test_lscpu;
 
+#[cfg(feature = "lsmem")]
+#[path = "by-util/test_lsmem.rs"]
+mod test_lsmem;
+
 #[cfg(feature = "mountpoint")]
 #[path = "by-util/test_mountpoint.rs"]
 mod test_mountpoint;