cksum: added tests for --raw and fixed fmt whitespace error

src/uu/cksum/src/cksum.rs

@@ -6,15 +6,15 @@
 // spell-checker:ignore (ToDO) fname, algo
 use clap::{crate_version, value_parser, Arg, ArgAction, Command};
 use hex::encode;
+use std::error::Error;
 use std::ffi::OsStr;
+use std::fmt::Display;
 use std::fs::File;
 use std::io::{self, stdin, stdout, BufReader, Read, Write};
 use std::iter;
 use std::path::Path;
-use std::error::Error;
-use std::fmt::Display;
 use uucore::{
-    error::{FromIo, UResult, UError},
+    error::{FromIo, UError, UResult},
     format_usage, help_about, help_section, help_usage,
     sum::{
         div_ceil, Blake2b, Digest, DigestWriter, Md5, Sha1, Sha224, Sha256, Sha384, Sha512, Sm3,
@@ -51,8 +51,7 @@ impl UError for CkSumError {
     }
 }
 
-impl Error for CkSumError {
-}
+impl Error for CkSumError {}
 
 impl Display for CkSumError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -152,7 +151,7 @@ fn cksum<'a, I>(mut options: Options, files: I) -> UResult<()>
 where
     I: Iterator<Item = &'a OsStr>,
 {
-    let files_vec:Vec<_> = files.collect();
+    let files_vec: Vec<_> = files.collect();
     if options.raw && files_vec.len() > 1 {
         return Err(Box::new(CkSumError::RawMultipleFiles));
     }

tests/by-util/test_cksum.rs

@@ -286,3 +286,25 @@ fn test_length_is_zero() {
         .no_stderr()
         .stdout_is_fixture("length_is_zero.expected");
 }
+
+#[test]
+fn test_raw_single_file() {
+    new_ucmd!()
+        .arg("--raw")
+        .arg("lorem_ipsum.txt")
+        .succeeds()
+        .no_stderr()
+        .stdout_is_fixture("raw_single_file.expected");
+}
+
+#[test]
+fn test_raw_multiple_files() {
+    new_ucmd!()
+        .arg("--raw")
+        .arg("lorem_ipsum.txt")
+        .arg("alice_in_wonderland.txt")
+        .fails()
+        .no_stdout()
+        .stderr_contains("cksum: the --raw option is not supported with multiple files")
+        .code_is(1);
+}