let test_empty_mod = module {
} => {
};

let empty_mod_instance = test_empty_mod{};

let test_simple_mod = module {
    arg = "value",
} => {
    let value = mod.arg;
};

let simple_mod_instance = test_simple_mod{};
assert |
    simple_mod_instance.value == "value";
|;

let simple_mod_with_args = test_simple_mod{arg = "othervalue"};
assert |
    simple_mod_with_args.value == "othervalue";
|;

let embedded_mod = module {
    deep_value = "None",
    env = "None",
} => {
    let env_name = select mod.env, "qa", {
        None = "qa",
        prod = "prod",
        qa = "qa",
        uat = "uat",
    };
    let embedded_def = module {
        deep_value = "None",
    } => {
        let value = mod.deep_value;
    };

    let embedded = embedded_def{deep_value = mod.deep_value};
};

let embedded_default_params = embedded_mod{};

assert |
    embedded_default_params.embedded.value == "None";
|;

assert |
    embedded_default_params.env_name == "qa";
|;

let embedded_with_params = embedded_mod{deep_value = "Some"};

assert |
    embedded_with_params.embedded.value == "Some";
|;