test: add parse line multiple word test

src/parse.rs

@@ -18,4 +18,12 @@ mod tests {
     fn test_parse_single() {
         assert_eq!(parse_line("keyword"), Ok(("keyword", vec![])))
     }
+
+    #[test]
+    fn test_parse_multiple() {
+        assert_eq!(
+            parse_line("keyword arg1 arg2"),
+            Ok(("keyword", vec!["arg1".to_string(), "arg2".to_string()]))
+        )
+    }
 }