Do not print parens for parameterless attributes in swayfmt (FuelLabs…

…#3465)

close FuelLabs#3451

swayfmt/src/formatter/mod.rs

@@ -1152,6 +1152,28 @@ fn func_with_multiline_collections() {
 fn func_with_multiline_collections() {
     let x = ("hello", "world");
 }
+"#;
+        let mut formatter = Formatter::default();
+        let formatted_sway_code =
+            Formatter::format(&mut formatter, Arc::from(sway_code_to_format), None).unwrap();
+        assert_eq!(correct_sway_code, formatted_sway_code);
+        assert!(test_stability(formatted_sway_code, formatter));
+    }
+    #[test]
+    fn test_parameterless_attributes() {
+        let sway_code_to_format = r#"library my_lib;
+
+abi MyContract {
+    #[test]
+    fn foo();
+}
+"#;
+        let correct_sway_code = r#"library my_lib;
+
+abi MyContract {
+    #[test]
+    fn foo();
+}
 "#;
         let mut formatter = Formatter::default();
         let formatted_sway_code =

swayfmt/src/utils/language/attribute.rs

@@ -59,14 +59,14 @@ impl Format for AttributeDecl {
                     Self::open_square_bracket(formatted_code, formatter)?;
                     // name e.g. `storage`
                     write!(formatted_code, "{}", attr.name.span().as_str())?;
-                    // `(`
-                    Self::open_parenthesis(formatted_code, formatter)?;
-                    // format and add args e.g. `read, write`
                     if let Some(args) = &attr.args {
+                        // `(`
+                        Self::open_parenthesis(formatted_code, formatter)?;
+                        // format and add args e.g. `read, write`
                         args.get().format(formatted_code, formatter)?;
-                    }
-                    // ')'
-                    Self::close_parenthesis(formatted_code, formatter)?;
+                        // ')'
+                        Self::close_parenthesis(formatted_code, formatter)?;
+                    };
                     // `]\n`
                     Self::close_square_bracket(formatted_code, formatter)?;