# Notes for writing tests

- Always use the `expr!` macro when writing tests to avoid borrowing `base` as mutable more than once.
- Use the `use crate::nid::named::{x0, x1, x2}` style for variable declarations to keep the code concise and readable.
- The `expr!` macro is located in the `anf.rs` file and can be used to build expressions concisely.
