split: fix error msg shown if file doesn't exist

src/uu/split/src/split.rs

@@ -1635,12 +1635,8 @@ fn split(settings: &Settings) -> UResult<()> {
     let r_box = if settings.input == "-" {
         Box::new(stdin()) as Box<dyn Read>
     } else {
-        let r = File::open(Path::new(&settings.input)).map_err_context(|| {
+        let r = File::open(Path::new(&settings.input))
-            format!(
+            .map_err_context(|| format!("cannot open {} for reading", settings.input.quote()))?;
-                "cannot open {} for reading: No such file or directory",
-                settings.input.quote()
-            )
-        })?;
         Box::new(r) as Box<dyn Read>
     };
     let mut reader = if let Some(c) = settings.io_blksize {

tests/by-util/test_split.rs

@@ -123,6 +123,15 @@ fn test_invalid_arg() {
     new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
 }
 
+#[test]
+fn test_split_non_existing_file() {
+    new_ucmd!()
+        .arg("non-existing")
+        .fails()
+        .code_is(1)
+        .stderr_is("split: cannot open 'non-existing' for reading: No such file or directory\n");
+}
+
 #[test]
 fn test_split_default() {
     let (at, mut ucmd) = at_and_ucmd!();