From 796ee834c1e31ead4c5479bf2827a4339c5d61d1 Mon Sep 17 00:00:00 2001
From: Antoine Stevan <44101798+amtoine@users.noreply.github.com>
Date: Wed, 28 Jun 2023 22:50:34 +0200
Subject: [PATCH] test that running `nufmt` twice produces the same output
 (#40)

original discussion on Discord:
https://discord.com/channels/601130461678272522/1117921521520873623/1123167419951763466

cc/ @AucaCoyan
---
 src/lib.rs | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 6a98627..660f2f9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,11 +41,14 @@ pub fn format_string(input_string: &String, config: &Config) -> String {
 mod test {
     use super::*;
 
+    /// test that
+    /// 1. formatting the input gives the expected result
+    /// 2. formatting the output of `nufmt` a second time does not change the content
     fn run_test(input: &str, expected: &str) {
-        assert_eq!(
-            expected.to_string(),
-            format_string(&input.to_string(), &Config::default())
-        );
+        let formatted = format_string(&input.to_string(), &Config::default());
+
+        assert_eq!(expected.to_string(), formatted);
+        assert_eq!(formatted, format_string(&formatted, &Config::default()));
     }
 
     #[test]