Keep forward slash when autocomplete on Windows (#13321)

Related #7044 

# Description
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When autocomplete path with `/` on Windows, paths keep with slash
instead of backslash(`\`).

If mixed both, path completion uses a last path seperator.


![image](https://github.com/nushell/nushell/assets/4014016/b09633fd-0e4a-4cd9-9c14-2bca30625804)


![image](https://github.com/nushell/nushell/assets/4014016/e1f228f8-4cce-43eb-a34a-dfa54efd2ebb)


![image](https://github.com/nushell/nushell/assets/4014016/0694443a-3017-4828-be60-5f39ffd96440)

# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->


![completion](https://github.com/nushell/nushell/assets/4014016/03626544-6a14-4d8b-a607-21a4472f8037)

# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
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- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to
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- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
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- `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the
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> from `nushell` you can also use the `toolkit` as follows
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> use toolkit.nu # or use an `env_change` hook to activate it
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> toolkit check pr
> ```
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crates/nu-cli/src/completions/completion_common.rs

@@ -10,9 +10,7 @@ use nu_protocol::{
     levenshtein_distance, Span,
 };
 use nu_utils::get_ls_colors;
-use std::path::{
-    is_separator, Component, Path, PathBuf, MAIN_SEPARATOR as SEP, MAIN_SEPARATOR_STR,
-};
+use std::path::{is_separator, Component, Path, PathBuf, MAIN_SEPARATOR as SEP};
 
 use super::SortBy;
 
@@ -93,16 +91,16 @@ enum OriginalCwd {
 }
 
 impl OriginalCwd {
-    fn apply(&self, mut p: PathBuiltFromString) -> String {
+    fn apply(&self, mut p: PathBuiltFromString, path_separator: char) -> String {
         match self {
             Self::None => {}
             Self::Home => p.parts.insert(0, "~".to_string()),
             Self::Prefix(s) => p.parts.insert(0, s.clone()),
         };
 
-        let mut ret = p.parts.join(MAIN_SEPARATOR_STR);
+        let mut ret = p.parts.join(&path_separator.to_string());
         if p.isdir {
-            ret.push(SEP);
+            ret.push(path_separator);
         }
         ret
     }
@@ -133,6 +131,14 @@ pub fn complete_item(
 ) -> Vec<(nu_protocol::Span, String, Option<Style>)> {
     let partial = surround_remove(partial);
     let isdir = partial.ends_with(is_separator);
+
+    #[cfg(unix)]
+    let path_separator = SEP;
+    #[cfg(windows)]
+    let path_separator = partial
+        .chars()
+        .rfind(|c: &char| is_separator(*c))
+        .unwrap_or(SEP);
     let cwd_pathbuf = Path::new(cwd).to_path_buf();
     let ls_colors = (engine_state.config.use_ls_colors_completions
         && engine_state.config.use_ansi_coloring)
@@ -195,7 +201,7 @@ pub fn complete_item(
     )
     .into_iter()
     .map(|p| {
-        let path = original_cwd.apply(p);
+        let path = original_cwd.apply(p, path_separator);
         let style = ls_colors.as_ref().map(|lsc| {
             lsc.style_for_path_with_metadata(
                 &path,

crates/nu-cli/tests/completions/mod.rs

@@ -32,7 +32,6 @@ fn completer() -> NuCompleter {
 fn completer_strings() -> NuCompleter {
     // Create a new engine
     let (dir, _, mut engine, mut stack) = new_engine();
-
     // Add record value as example
     let record = r#"def animals [] { ["cat", "dog", "eel" ] }
     def my-command [animal: string@animals] { print $animal }"#;
@@ -123,28 +122,28 @@ fn variables_double_dash_argument_with_flagcompletion(mut completer: NuCompleter
     let suggestions = completer.complete("tst --", 6);
     let expected: Vec<String> = vec!["--help".into(), "--mod".into()];
     // dbg!(&expected, &suggestions);
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn variables_single_dash_argument_with_flagcompletion(mut completer: NuCompleter) {
     let suggestions = completer.complete("tst -", 5);
     let expected: Vec<String> = vec!["--help".into(), "--mod".into(), "-h".into(), "-s".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn variables_command_with_commandcompletion(mut completer_strings: NuCompleter) {
     let suggestions = completer_strings.complete("my-c ", 4);
     let expected: Vec<String> = vec!["my-command".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn variables_subcommands_with_customcompletion(mut completer_strings: NuCompleter) {
     let suggestions = completer_strings.complete("my-command ", 11);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
@@ -153,7 +152,7 @@ fn variables_customcompletion_subcommands_with_customcompletion_2(
 ) {
     let suggestions = completer_strings.complete("my-command ", 11);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[test]
@@ -182,19 +181,19 @@ fn dotnu_completions() {
     let completion_str = "source-env ".to_string();
     let suggestions = completer.complete(&completion_str, completion_str.len());
 
-    match_suggestions(expected.clone(), suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test use completion
     let completion_str = "use ".to_string();
     let suggestions = completer.complete(&completion_str, completion_str.len());
 
-    match_suggestions(expected.clone(), suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test overlay use completion
     let completion_str = "overlay use ".to_string();
     let suggestions = completer.complete(&completion_str, completion_str.len());
 
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[test]
@@ -258,8 +257,22 @@ fn file_completions() {
         folder(dir.join(".hidden_folder")),
     ];
 
+    #[cfg(windows)]
+    {
+        let separator = '/';
+        let target_dir = format!("cp {dir_str}{separator}");
+        let slash_suggestions = completer.complete(&target_dir, target_dir.len());
+
+        let expected_slash_paths: Vec<String> = expected_paths
+            .iter()
+            .map(|s| s.replace('\\', "/"))
+            .collect();
+
+        match_suggestions(&expected_slash_paths, &slash_suggestions);
+    }
+
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completions for a file
     let target_dir = format!("cp {}", folder(dir.join("another")));
@@ -269,17 +282,91 @@ fn file_completions() {
     let expected_paths: Vec<String> = vec![file(dir.join("another").join("newfile"))];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completions for hidden files
-    let target_dir = format!("ls {}/.", folder(dir.join(".hidden_folder")));
+    let target_dir = format!("ls {}{MAIN_SEPARATOR}.", folder(dir.join(".hidden_folder")));
     let suggestions = completer.complete(&target_dir, target_dir.len());
 
     let expected_paths: Vec<String> =
         vec![file(dir.join(".hidden_folder").join(".hidden_subfile"))];
 
+    #[cfg(windows)]
+    {
+        let target_dir = format!("ls {}/.", folder(dir.join(".hidden_folder")));
+        let slash_suggestions = completer.complete(&target_dir, target_dir.len());
+
+        let expected_slash: Vec<String> = expected_paths
+            .iter()
+            .map(|s| s.replace('\\', "/"))
+            .collect();
+
+        match_suggestions(&expected_slash, &slash_suggestions);
+    }
+
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
+}
+
+#[cfg(windows)]
+#[test]
+fn file_completions_with_mixed_separators() {
+    // Create a new engine
+    let (dir, dir_str, engine, stack) = new_dotnu_engine();
+
+    // Instantiate a new completer
+    let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
+
+    // Create Expected values
+    let expected_paths: Vec<String> = vec![
+        file(dir.join("lib-dir1").join("bar.nu")),
+        file(dir.join("lib-dir1").join("baz.nu")),
+        file(dir.join("lib-dir1").join("xyzzy.nu")),
+    ];
+    let expecetd_slash_paths: Vec<String> = expected_paths
+        .iter()
+        .map(|s| s.replace(MAIN_SEPARATOR, "/"))
+        .collect();
+
+    let target_dir = format!("ls {dir_str}/lib-dir1/");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expecetd_slash_paths, &suggestions);
+
+    let target_dir = format!("cp {dir_str}\\lib-dir1/");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expecetd_slash_paths, &suggestions);
+
+    let target_dir = format!("ls {dir_str}/lib-dir1\\/");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expecetd_slash_paths, &suggestions);
+
+    let target_dir = format!("ls {dir_str}\\lib-dir1\\/");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expecetd_slash_paths, &suggestions);
+
+    let target_dir = format!("ls {dir_str}\\lib-dir1\\");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expected_paths, &suggestions);
+
+    let target_dir = format!("ls {dir_str}/lib-dir1\\");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expected_paths, &suggestions);
+
+    let target_dir = format!("ls {dir_str}/lib-dir1/\\");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expected_paths, &suggestions);
+
+    let target_dir = format!("ls {dir_str}\\lib-dir1/\\");
+    let suggestions = completer.complete(&target_dir, target_dir.len());
+
+    match_suggestions(&expected_paths, &suggestions);
 }
 
 #[test]
@@ -303,7 +390,7 @@ fn partial_completions() {
     ];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completions for the files whose name begin with "h"
     // and are present under directories whose names begin with "pa"
@@ -324,7 +411,7 @@ fn partial_completions() {
     ];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completion for all files under directories whose names begin with "pa"
     let dir_str = folder(dir.join("pa"));
@@ -345,7 +432,7 @@ fn partial_completions() {
     ];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completion for a single file
     let dir_str = file(dir.join("fi").join("so"));
@@ -356,7 +443,7 @@ fn partial_completions() {
     let expected_paths: Vec<String> = vec![file(dir.join("final_partial").join("somefile"))];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completion where there is a sneaky `..` in the path
     let dir_str = file(dir.join("par").join("..").join("fi").join("so"));
@@ -392,7 +479,7 @@ fn partial_completions() {
     ];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completion for all files under directories whose names begin with "pa"
     let file_str = file(dir.join("partial-a").join("have"));
@@ -406,7 +493,7 @@ fn partial_completions() {
     ];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     // Test completion for all files under directories whose names begin with "pa"
     let file_str = file(dir.join("partial-a").join("have_ext."));
@@ -420,7 +507,7 @@ fn partial_completions() {
     ];
 
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 }
 
 #[test]
@@ -455,15 +542,16 @@ fn command_ls_with_filecompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     let target_dir = "ls custom_completion.";
     let suggestions = completer.complete(target_dir, target_dir.len());
 
     let expected_paths: Vec<String> = vec!["custom_completion.nu".to_string()];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions);
 }
+
 #[test]
 fn command_open_with_filecompletion() {
     let (_, _, engine, stack) = new_engine();
@@ -496,14 +584,14 @@ fn command_open_with_filecompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     let target_dir = "open custom_completion.";
     let suggestions = completer.complete(target_dir, target_dir.len());
 
     let expected_paths: Vec<String> = vec!["custom_completion.nu".to_string()];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions);
 }
 
 #[test]
@@ -538,7 +626,7 @@ fn command_rm_with_globcompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -573,7 +661,7 @@ fn command_cp_with_globcompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -608,7 +696,7 @@ fn command_save_with_filecompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -643,7 +731,7 @@ fn command_touch_with_filecompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -678,7 +766,7 @@ fn command_watch_with_filecompletion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[rstest]
@@ -686,19 +774,19 @@ fn subcommand_completions(mut subcommand_completer: NuCompleter) {
     let prefix = "foo br";
     let suggestions = subcommand_completer.complete(prefix, prefix.len());
     match_suggestions(
-        vec!["foo bar".to_string(), "foo aabrr".to_string()],
-        suggestions,
+        &vec!["foo bar".to_string(), "foo aabrr".to_string()],
+        &suggestions,
     );
 
     let prefix = "foo b";
     let suggestions = subcommand_completer.complete(prefix, prefix.len());
     match_suggestions(
-        vec![
+        &vec![
             "foo bar".to_string(),
             "foo abaz".to_string(),
             "foo aabrr".to_string(),
         ],
-        suggestions,
+        &suggestions,
     );
 }
 
@@ -724,7 +812,7 @@ fn file_completion_quoted() {
         format!("`{}`", folder("test dir")),
     ];
 
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 
     let dir: PathBuf = "test dir".into();
     let target_dir = format!("open '{}'", folder(dir.clone()));
@@ -735,7 +823,7 @@ fn file_completion_quoted() {
         format!("`{}`", file(dir.join("single quote"))),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -770,7 +858,7 @@ fn flag_completions() {
     ];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[test]
@@ -794,8 +882,21 @@ fn folder_with_directorycompletions() {
         folder(dir.join(".hidden_folder")),
     ];
 
+    #[cfg(windows)]
+    {
+        let target_dir = format!("cd {dir_str}/");
+        let slash_suggestions = completer.complete(&target_dir, target_dir.len());
+
+        let expected_slash_paths: Vec<String> = expected_paths
+            .iter()
+            .map(|s| s.replace('\\', "/"))
+            .collect();
+
+        match_suggestions(&expected_slash_paths, &slash_suggestions);
+    }
+
     // Match the results
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 }
 
 #[test]
@@ -837,7 +938,7 @@ fn variables_completions() {
     ];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test completions for $nu.h (filter)
     let suggestions = completer.complete("$nu.h", 5);
@@ -851,7 +952,7 @@ fn variables_completions() {
     ];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test completions for $nu.os-info
     let suggestions = completer.complete("$nu.os-info.", 12);
@@ -863,7 +964,7 @@ fn variables_completions() {
         "name".into(),
     ];
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test completions for custom var
     let suggestions = completer.complete("$actor.", 7);
@@ -873,7 +974,7 @@ fn variables_completions() {
     let expected: Vec<String> = vec!["age".into(), "name".into()];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test completions for custom var (filtering)
     let suggestions = completer.complete("$actor.n", 8);
@@ -883,7 +984,7 @@ fn variables_completions() {
     let expected: Vec<String> = vec!["name".into()];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test completions for $env
     let suggestions = completer.complete("$env.", 5);
@@ -896,7 +997,7 @@ fn variables_completions() {
     let expected: Vec<String> = vec!["PATH".into(), "PWD".into(), "TEST".into()];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     // Test completions for $env
     let suggestions = completer.complete("$env.T", 6);
@@ -906,12 +1007,12 @@ fn variables_completions() {
     let expected: Vec<String> = vec!["TEST".into()];
 
     // Match results
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 
     let suggestions = completer.complete("$", 1);
     let expected: Vec<String> = vec!["$actor".into(), "$env".into(), "$in".into(), "$nu".into()];
 
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[test]
@@ -930,7 +1031,7 @@ fn alias_of_command_and_flags() {
     #[cfg(not(windows))]
     let expected_paths: Vec<String> = vec!["test_a/".to_string(), "test_b/".to_string()];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -949,7 +1050,7 @@ fn alias_of_basic_command() {
     #[cfg(not(windows))]
     let expected_paths: Vec<String> = vec!["test_a/".to_string(), "test_b/".to_string()];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[test]
@@ -971,7 +1072,7 @@ fn alias_of_another_alias() {
     #[cfg(not(windows))]
     let expected_paths: Vec<String> = vec!["test_a/".to_string(), "test_b/".to_string()];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 fn run_external_completion(completer: &str, input: &str) -> Vec<Suggestion> {
@@ -1034,35 +1135,35 @@ fn unknown_command_completion() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions)
+    match_suggestions(&expected_paths, &suggestions)
 }
 
 #[rstest]
 fn flagcompletion_triggers_after_cursor(mut completer: NuCompleter) {
     let suggestions = completer.complete("tst -h", 5);
     let expected: Vec<String> = vec!["--help".into(), "--mod".into(), "-h".into(), "-s".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn customcompletion_triggers_after_cursor(mut completer_strings: NuCompleter) {
     let suggestions = completer_strings.complete("my-command c", 11);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn customcompletion_triggers_after_cursor_piped(mut completer_strings: NuCompleter) {
     let suggestions = completer_strings.complete("my-command c | ls", 11);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn flagcompletion_triggers_after_cursor_piped(mut completer: NuCompleter) {
     let suggestions = completer.complete("tst -h | ls", 5);
     let expected: Vec<String> = vec!["--help".into(), "--mod".into(), "-h".into(), "-s".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[test]
@@ -1096,77 +1197,77 @@ fn filecompletions_triggers_after_cursor() {
         ".hidden_folder/".to_string(),
     ];
 
-    match_suggestions(expected_paths, suggestions);
+    match_suggestions(&expected_paths, &suggestions);
 }
 
 #[rstest]
 fn extern_custom_completion_positional(mut extern_completer: NuCompleter) {
     let suggestions = extern_completer.complete("spam ", 5);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn extern_custom_completion_long_flag_1(mut extern_completer: NuCompleter) {
     let suggestions = extern_completer.complete("spam --foo=", 11);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn extern_custom_completion_long_flag_2(mut extern_completer: NuCompleter) {
     let suggestions = extern_completer.complete("spam --foo ", 11);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn extern_custom_completion_long_flag_short(mut extern_completer: NuCompleter) {
     let suggestions = extern_completer.complete("spam -f ", 8);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn extern_custom_completion_short_flag(mut extern_completer: NuCompleter) {
     let suggestions = extern_completer.complete("spam -b ", 8);
     let expected: Vec<String> = vec!["cat".into(), "dog".into(), "eel".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn extern_complete_flags(mut extern_completer: NuCompleter) {
     let suggestions = extern_completer.complete("spam -", 6);
     let expected: Vec<String> = vec!["--foo".into(), "-b".into(), "-f".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn custom_completer_triggers_cursor_before_word(mut custom_completer: NuCompleter) {
     let suggestions = custom_completer.complete("cmd foo  bar", 8);
     let expected: Vec<String> = vec!["cmd".into(), "foo".into(), "".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn custom_completer_triggers_cursor_on_word_left_boundary(mut custom_completer: NuCompleter) {
     let suggestions = custom_completer.complete("cmd foo bar", 8);
     let expected: Vec<String> = vec!["cmd".into(), "foo".into(), "".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn custom_completer_triggers_cursor_next_to_word(mut custom_completer: NuCompleter) {
     let suggestions = custom_completer.complete("cmd foo bar", 11);
     let expected: Vec<String> = vec!["cmd".into(), "foo".into(), "bar".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[rstest]
 fn custom_completer_triggers_cursor_after_word(mut custom_completer: NuCompleter) {
     let suggestions = custom_completer.complete("cmd foo bar ", 12);
     let expected: Vec<String> = vec!["cmd".into(), "foo".into(), "bar".into(), "".into()];
-    match_suggestions(expected, suggestions);
+    match_suggestions(&expected, &suggestions);
 }
 
 #[ignore = "was reverted, still needs fixing"]

crates/nu-cli/tests/completions/support/completions_helpers.rs

@@ -186,7 +186,7 @@ pub fn new_partial_engine() -> (AbsolutePathBuf, String, EngineState, Stack) {
 }
 
 // match a list of suggestions with the expected values
-pub fn match_suggestions(expected: Vec<String>, suggestions: Vec<Suggestion>) {
+pub fn match_suggestions(expected: &Vec<String>, suggestions: &Vec<Suggestion>) {
     let expected_len = expected.len();
     let suggestions_len = suggestions.len();
     if expected_len != suggestions_len {
@@ -196,13 +196,13 @@ pub fn match_suggestions(expected: Vec<String>, suggestions: Vec<Suggestion>) {
             Expected: {expected:#?}\n"
         )
     }
-    assert_eq!(
-        expected,
-        suggestions
-            .into_iter()
-            .map(|it| it.value)
-            .collect::<Vec<_>>()
-    );
+
+    let suggestoins_str = suggestions
+        .iter()
+        .map(|it| it.value.clone())
+        .collect::<Vec<_>>();
+
+    assert_eq!(expected, &suggestoins_str);
 }
 
 // append the separator to the converted path