Implement an option to show paths made of mkdir. (#1932)

crates/nu-cli/tests/commands/mkdir.rs

@@ -1,6 +1,6 @@
 use nu_test_support::fs::files_exist_at;
-use nu_test_support::nu;
 use nu_test_support::playground::Playground;
+use nu_test_support::{nu, pipeline};
 use std::path::Path;
 
 #[test]
@@ -61,3 +61,25 @@ fn create_directory_two_parents_up_using_multiple_dots() {
         assert!(expected.exists());
     })
 }
+
+#[test]
+fn show_created_paths() {
+    Playground::setup("mkdir_test_2", |dirs, _| {
+        let actual = nu!(
+         cwd: dirs.test(),
+         pipeline(
+             r#"
+                 mkdir -s dir_1 dir_2 dir_3
+                 | count
+                 | echo $it
+             "#
+        ));
+
+        assert!(files_exist_at(
+            vec![Path::new("dir_1"), Path::new("dir_2"), Path::new("dir_3")],
+            dirs.test()
+        ));
+
+        assert_eq!(actual.out, "3");
+    })
+}