Function test_default_value_unknown_import

tests/all/linker.rs:414–445

()

#[test]
#[cfg_attr(miri, ignore)]
fn test_default_value_unknown_import() -> Result<()> {
    const WAT: &str = r#"
      (module
        (import "unknown" "func" (func $unknown_func (result i64 f32 externref)))
        (func (export "run") (result i64 f32 externref)
          call $unknown_func
        )
      )
    "#;

    let mut store = Store::<()>::default();
    let module = Module::new(store.engine(), WAT).expect("failed to create module");
    let mut linker = Linker::new(store.engine());

    linker.define_unknown_imports_as_default_values(&mut store, &module)?;
    let instance = linker.instantiate(&mut store, &module)?;

    // "run" calls an import function which will not be defined, so it should
    // return default values.
    let run_func = instance
        .get_func(&mut store, "run")
        .expect("expected a run func in the module");

    let mut results = vec![Val::I32(1), Val::I32(2), Val::I32(3)];
    run_func.call(&mut store, &[], &mut results)?;

    assert_eq!(results[0].i64(), Some(0));
    assert_eq!(results[1].f32(), Some(0.0));
    assert!(results[2].externref().unwrap().is_none());

    Ok(())
}

#[test]
#[cfg_attr(miri, ignore)]