如何忽略FsUnit的断言中有区别的联合案例的价值？
举个例子：
type TransactionAttempt = {
Deposited:float
Requires:float
}
type RequestResult =
| Denied of TransactionAttempt
| Granted of Product
在我的测试中，我想这样做：
let display = balance |> select Pepsi
display |> should equal Denied
我不介意这样做：
display |> should equal (Denied _)
但是，我被迫这样做：
display |> should equal (Denied {Deposited=0.25; Requires=1.00})
注意我必须对上面的表达式有多明确。
因此，我只想知道它是否被拒绝。我不在乎细节。
这是实际的测试：
[<Test>]
let ``Vending machine reflects more money required for selection``() =
// Setup
let balance = Quarter |> insert []
// Test
let display = balance |> select Pepsi
// Verify
display |> should equal (Denied {Deposited=0.25; Requires=1.00})
功能如下：
let select product balance =
let attempt = { Deposited=balance
Requires=product |> getPrice }
let paidInFull = attempt.Deposited >= attempt.Requires
if not paidInFull then
Denied attempt
else Granted product
这是整个域：
module Machine
type Deposit =
| Nickel
| Dime
| Quarter
| OneDollarBill
| FiveDollarBill
type TransactionAttempt = {
Deposited:float
Requires:float
}
type State =
| OutOfService
| PaymentReceived of Deposit
| WaitingForSelection
| NotPaidInFull of TransactionAttempt
type Product =
| Pepsi
| Coke
| Sprite
| MountainDew
type RequestResult =
| Denied of TransactionAttempt
| Granted of Product
(* Functions *)
open System
let display = function
| OutOfService -> "Out of Service"
| WaitingForSelection -> "Make selection"
| NotPaidInFull attempt -> sprintf "%s Required" ((attempt.Requires - attempt.Deposited).ToString("C2"))
| PaymentReceived deposit -> match deposit with
| Nickel -> "5¢"
| Dime -> "10¢"
| Quarter -> "25¢"
| OneDollarBill -> "$1.00"
| FiveDollarBill -> "$5.00"
let getBalance coins =
coins |> List.fold (fun acc d -> match d with
| Nickel -> acc + 0.05
| Dime -> acc + 0.10
| Quarter -> acc + 0.25
| OneDollarBill -> acc + 1.00
| FiveDollarBill -> acc + 5.00) 0.00
let insert balance coin =
coin::balance |> getBalance
let getPrice = function
| Pepsi -> 1.00
| Coke -> 1.00
| Sprite -> 1.00
| MountainDew -> 1.00
let select product balance =
let attempt = { Deposited=balance
Requires=product |> getPrice }
let paidInFull = attempt.Deposited >= attempt.Requires
if not paidInFull then
Denied attempt
else Granted product
我能想到的最简单的事情是为所需的支票写一个谓词：
let isDenied du =
match du with
| Denied _ -> true
| _ -> false
或既然let f x = match x with ...等效于let f = function ...，则可能是：
let isDenied = function Denied _ -> true | _ -> false
然后您的测试如下所示：
display |> isDenied |> should be True
注意True，以大写字母T为约束。如果您要与布尔值进行比较，那么它将是
display |> isDenied |> should equal true
如果发现必须编写这些自定义谓词的全部内容，则可能存在更通用的解决方案，其中包括为NUnit或XUnit或后端使用的任何测试框架编写自定义约束。但是，作为F＃的相对新手，您可能应该首先使用简单的解决方案，然后再对其进行概括。
PS如果您确实决定编写自定义约束，请查看https://github.com/fsprojects/FsUnit/blob/master/src/FsUnit.NUnit/FsUnit.fs（如果您使用的是NUnit）或https：/ /github.com/fsprojects/FsUnit/blob/master/src/FsUnit.Xunit/FsUnit.fs（如果您使用的是XUnit）的灵感。
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