tests ~ reorganize tests

tests/by-util/test_chown.rs

@@ -0,0 +1,48 @@
+use crate::common::util::*;
+
+extern crate chown;
+// pub use self::uu_chown::*;
+
+#[cfg(test)]
+mod test_passgrp {
+    use super::chown::entries::{gid2grp, grp2gid, uid2usr, usr2uid};
+
+    #[test]
+    fn test_usr2uid() {
+        assert_eq!(0, usr2uid("root").unwrap());
+        assert!(usr2uid("88888888").is_err());
+        assert!(usr2uid("auserthatdoesntexist").is_err());
+    }
+
+    #[test]
+    fn test_grp2gid() {
+        if cfg!(target_os = "linux") || cfg!(target_os = "android") || cfg!(target_os = "windows") {
+            assert_eq!(0, grp2gid("root").unwrap())
+        } else {
+            assert_eq!(0, grp2gid("wheel").unwrap());
+        }
+        assert!(grp2gid("88888888").is_err());
+        assert!(grp2gid("agroupthatdoesntexist").is_err());
+    }
+
+    #[test]
+    fn test_uid2usr() {
+        assert_eq!("root", uid2usr(0).unwrap());
+        assert!(uid2usr(88888888).is_err());
+    }
+
+    #[test]
+    fn test_gid2grp() {
+        if cfg!(target_os = "linux") || cfg!(target_os = "android") || cfg!(target_os = "windows") {
+            assert_eq!("root", gid2grp(0).unwrap());
+        } else {
+            assert_eq!("wheel", gid2grp(0).unwrap());
+        }
+        assert!(gid2grp(88888888).is_err());
+    }
+}
+
+#[test]
+fn test_invalid_option() {
+    new_ucmd!().arg("-w").arg("-q").arg("/").fails();
+}