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//! Test that a setting a field on a `#[salsa::input]`
//! overwrites and returns the old value.
use salsa::Setter;
use test_log::test;
#[salsa::input]
struct MyInput {
field: String,
}
#[test]
fn execute() {
let mut db = salsa::DatabaseImpl::new();
let input = MyInput::new(&db, "Hello".to_string());
// Overwrite field with an empty String
// and store the old value in my_string
let mut my_string = input.set_field(&mut db).to(String::new());
my_string.push_str(" World!");
// Set the field back to out initial String,
// expecting to get the empty one back
assert_eq!(input.set_field(&mut db).to(my_string), "");
// Check if the stored String is the one we expected
assert_eq!(input.field(&db), "Hello World!");
}
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