test(cli): the script helper's two spellings share one type

932c0517 pushed a helper whose branches were arrays of different
lengths; the three test binaries did not compile. A slice now.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

crates/ledger-cli/tests/format_upgrade.rs

@@ -978,12 +978,10 @@ fn books_p2_served_cut_over_whole() {
 /// with the command's exit code as its own: util-linux's spelling on
 /// Linux, BSD's on macOS (no `-f`, no `-c`; the command after the file).
 fn script_args(command: &str) -> Vec<String> {
-    if cfg!(target_os = "macos") {
+    let args: &[&str] = if cfg!(target_os = "macos") {
-        ["-qeF", "/dev/null", "/bin/sh", "-c", command]
+        &["-qeF", "/dev/null", "/bin/sh", "-c", command]
     } else {
-        ["-qefc", command, "/dev/null"]
+        &["-qefc", command, "/dev/null"]
-    }
+    };
-    .into_iter()
+    args.iter().map(|a| a.to_string()).collect()
-    .map(String::from)
-    .collect()
 }

crates/ledger-cli/tests/open_while_held.rs

@@ -2953,12 +2953,10 @@ fn token_check_says_where_the_token_file_stands_and_an_unreadable_one_is_said()
 /// with the command's exit code as its own: util-linux's spelling on
 /// Linux, BSD's on macOS (no `-f`, no `-c`; the command after the file).
 fn script_args(command: &str) -> Vec<String> {
-    if cfg!(target_os = "macos") {
+    let args: &[&str] = if cfg!(target_os = "macos") {
-        ["-qeF", "/dev/null", "/bin/sh", "-c", command]
+        &["-qeF", "/dev/null", "/bin/sh", "-c", command]
     } else {
-        ["-qefc", command, "/dev/null"]
+        &["-qefc", command, "/dev/null"]
-    }
+    };
-    .into_iter()
+    args.iter().map(|a| a.to_string()).collect()
-    .map(String::from)
-    .collect()
 }

crates/ledger-cli/tests/setup.rs

@@ -163,14 +163,12 @@ fn another_home_ignores_this_accounts_data_home() {
 /// with the command's exit code as its own: util-linux's spelling on
 /// Linux, BSD's on macOS (no `-f`, no `-c`; the command after the file).
 fn script_args(command: &str) -> Vec<String> {
-    if cfg!(target_os = "macos") {
+    let args: &[&str] = if cfg!(target_os = "macos") {
-        ["-qeF", "/dev/null", "/bin/sh", "-c", command]
+        &["-qeF", "/dev/null", "/bin/sh", "-c", command]
     } else {
-        ["-qefc", command, "/dev/null"]
+        &["-qefc", command, "/dev/null"]
-    }
+    };
-    .into_iter()
+    args.iter().map(|a| a.to_string()).collect()
-    .map(String::from)
-    .collect()
 }
 
 /// Run `args` at a terminal (a pseudo-terminal, through `script`),