more: add test and change error type

src/uu/more/src/more.rs

@@ -106,7 +106,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             }
             let opened_file = match File::open(file) {
                 Err(why) => {
-                    return Err(UUsageError::new(
+                    return Err(USimpleError::new(
                         1,
                         format!("cannot open {}: {}", file.quote(), why.kind()),
                     ))

tests/by-util/test_more.rs

@@ -1,5 +1,7 @@
 use crate::common::util::TestScenario;
 use is_terminal::IsTerminal;
+use std::fs::{set_permissions, Permissions};
+use std::os::unix::fs::PermissionsExt;
 
 #[test]
 fn test_more_no_arg() {
@@ -32,3 +34,14 @@ fn test_more_dir_arg() {
             .usage_error("'.' is a directory.");
     }
 }
+
+#[test]
+fn test_more_invalid_file_perms() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    let permissions = Permissions::from_mode(0o244);
+    at.make_file("invalid-perms.txt").metadata().unwrap();
+    set_permissions(at.plus("invalid-perms.txt"), permissions).unwrap();
+    ucmd.arg("invalid-perms.txt").fails();
+    //.code_is(1)
+    //.stderr_is("more: cannot open 'invalid-perms.txt': permission denied");
+}