import json

struct Test {
    optional_alias  ?MyAlias  // primitive
    optional_struct ?MyAlias2 // complex
}

struct Complex {
    a int = 3
}

type MyAlias = int
type MyAlias2 = Complex

fn test_empty() {
    test := Test{}
    encoded := json.encode(test)
    assert dump(encoded) == '{}'
    assert json.decode(Test, '{}')! == test
}

fn test_value() {
    test := Test{
        optional_alias: 1
    }
    encoded := json.encode(test)
    assert dump(encoded) == '{"optional_alias":1}'
    assert json.decode(Test, '{"optional_alias":1}')! == test
}

fn test_value_2() {
    test := Test{
        optional_alias:  1
        optional_struct: Complex{
            a: 1
        }
    }
    encoded := json.encode(test)
    assert dump(encoded) == '{"optional_alias":1,"optional_struct":{"a":1}}'
    assert json.decode(Test, '{"optional_alias":1,"optional_struct":{"a":1}}')! == test
}