one new test case and deleted duplicate show cksum: stops when one of…

… given files doesn't exist uutils#5809

src/uu/cksum/src/cksum.rs

@@ -14,7 +14,6 @@ use std::fs::File;
 use std::io::{self, stdin, stdout, BufReader, Read, Write};
 use std::iter;
 use std::path::Path;
-use uucore::show;
 use uucore::{
     error::{FromIo, UError, UResult, USimpleError},
     format_usage, help_about, help_section, help_usage, show,

tests/by-util/test_cksum.rs

@@ -349,3 +349,20 @@ fn test_folder_and_file() {
         .stderr_contains(format!("cksum: {folder_name}: Is a directory"))
         .stdout_is_fixture("crc_single_file.expected");
 }
+
+#[test]
+fn test_one_nonexisting_file(){
+    let (at, mut ucmd) = at_and_ucmd!();
+
+    at.touch("abc.txt");
+    at.touch("xyz.txt");
+
+    ucmd
+        .arg("abc.txt")
+        .arg("asdf.txt")
+        .arg("xyz.txt")
+        .fails()
+        .stdout_contains_line("4294967295 0 xyz.txt")
+        .stderr_contains("asdf.txt: No such file or directory")
+        .stdout_contains_line("4294967295 0 abc.txt");
+}