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我想在 F# 中使用 xUnit 对这段代码进行单元测试。我如何处理这些选项？

来自 Scott Wlaschin 的书：Domain Modeling Made Functional

type UnitQuantity = private UnitQuantity of int
// ^ private constructor

// define a module with the same name as the type
module UnitQuantity =
    /// Define a "smart constructor" for UnitQuantity
    /// int -> Result<UnitQuantity,string>
    let create qty =
        if qty < 1 then
            // failure
            Error "UnitQuantity can not be negative"
        else if qty > 1000 then
            // failure
            Error "UnitQuantity can not be more than …