cp: show relative path of source file with -vr (#8887)

* cp: show relative path of source file with -vr

Add test to cover fix.

* fix test expected output for windows

src/uu/cp/src/copydir.rs

@@ -296,7 +296,7 @@ fn copy_direntry(
     if !source_is_dir {
         if let Err(err) = copy_file(
             progress_bar,
-            &entry.source_absolute,
+            &entry.source_relative,
             entry.local_to_target.as_path(),
             options,
             symlinked_files,

tests/by-util/test_cp.rs

@@ -7136,3 +7136,30 @@ fn test_cp_no_preserve_target_directory() {
     assert!(at.file_exists("e/f2"));
     assert!(at.file_exists("e/f3"));
 }
+
+#[test]
+fn test_cp_recurse_verbose_output() {
+    let source_dir = "source_dir";
+    let target_dir = "target_dir";
+    let file = "file";
+    #[cfg(not(windows))]
+    let output = format!(
+        "'{source_dir}' -> '{target_dir}/'\n'{source_dir}/{file}' -> '{target_dir}/{file}'\n"
+    );
+    #[cfg(windows)]
+    let output = format!(
+        "'{source_dir}' -> '{target_dir}\\'\n'{source_dir}\\{file}' -> '{target_dir}\\{file}'\n"
+    );
+    let (at, mut ucmd) = at_and_ucmd!();
+
+    at.mkdir(source_dir);
+    at.touch(format!("{source_dir}/{file}"));
+
+    ucmd.arg(source_dir)
+        .arg(target_dir)
+        .arg("-r")
+        .arg("--verbose")
+        .succeeds()
+        .no_stderr()
+        .stdout_is(output);
+}