---
source: crates/rolldown_testing/src/integration_test.rs
---
# Assets
## main.js
```js
import assert from "node:assert";
//#region foo.mjs
var foo = null;
function setFoo(_foo) {
foo = _foo;
}
//#endregion
//#region main.js
setFoo(20);
assert.strictEqual(foo, 20);
//#endregion
```