diff --git a/src/builtins/change_prompt.rs b/src/builtins/change_prompt.rs
index 8aa0fb8..bab04f5 100644
--- a/src/builtins/change_prompt.rs
+++ b/src/builtins/change_prompt.rs
@@ -41,21 +41,40 @@ mod tests {
 
     #[test]
     fn test_change_prompt_no_args() {
-        assert_ne!(ChangePrompt.execute(&mut BuiltinConfig::new(), vec![]), Ok(()))
+        assert_ne!(
+            ChangePrompt.execute(&mut BuiltinConfig::new(), vec![]),
+            Ok(())
+        )
     }
 
     #[test]
     fn test_change_prompt_multiple_args() {
-        assert_eq!(ChangePrompt.execute(&mut BuiltinConfig::new(), vec!["1".to_string(), "2".to_string()]), Err(ShellError::ExecuteFailure("expected only one argument".to_string())))
+        assert_eq!(
+            ChangePrompt.execute(
+                &mut BuiltinConfig::new(),
+                vec!["1".to_string(), "2".to_string()]
+            ),
+            Err(ShellError::ExecuteFailure(
+                "expected only one argument".to_string()
+            ))
+        )
     }
 
     #[test]
     fn test_change_prompt_none() {
-        assert_eq!(ChangePrompt.execute(&mut BuiltinConfig::new(), vec!["none".to_string()]), Ok(()))
+        assert_eq!(
+            ChangePrompt.execute(&mut BuiltinConfig::new(), vec!["none".to_string()]),
+            Ok(())
+        )
     }
 
     #[test]
     fn test_change_prompt_invalid_style() {
-        assert_eq!(ChangePrompt.execute(&mut BuiltinConfig::new(), vec!["notexistent".to_string()]), Err(ShellError::ExecuteFailure("notexistent is not a valid prompt style".to_string())))
+        assert_eq!(
+            ChangePrompt.execute(&mut BuiltinConfig::new(), vec!["notexistent".to_string()]),
+            Err(ShellError::ExecuteFailure(
+                "notexistent is not a valid prompt style".to_string()
+            ))
+        )
     }
 }