name change

2026-04-22 15:35:37 +01:00
parent 1debc5d600
commit 7a6e565a49
1 changed files with 1 additions and 1 deletions
@@ -0,0 +1,80 @@
+using CsharpFp2.Application;
+using CsharpFp2.Domain;
+using CsharpFp2.Infrastructure;
+
+namespace CsharpFp2.Tests;
+
+/// Tests covering the application-layer use case surface:
+/// what the WithdrawMoney feature does from the caller's perspective.
+public class WithdrawMoneyTests
+{
+    private static (
+        WithdrawMoney withdraw,
+        LoadAccount loadAccount,
+        SaveAccount saveAccount
+    ) BuildHandler()
+    {
+        var (loadAccount, saveAccount) = InMemoryAccount.Create();
+        var withdraw = AccountApplication.CreateWithdrawMoney(loadAccount, saveAccount);
+        return (withdraw, loadAccount, saveAccount);
+    }
+
+    [Fact]
+    public void Withdrawing_from_an_account_reduces_its_balance_by_the_withdrawn_amount()
+    {
+        var (withdraw, loadAccount, saveAccount) = BuildHandler();
+        var accountId = Guid.NewGuid();
+        saveAccount(AccountDomain.Open(accountId, new Money(200m)));
+
+        withdraw(accountId, 75m);
+
+        var account = loadAccount(accountId)!;
+        Assert.Equal(125m, account.Balance.Amount);
+    }
+
+    [Fact]
+    public void Withdrawing_the_entire_balance_leaves_the_account_at_zero()
+    {
+        var (withdraw, loadAccount, saveAccount) = BuildHandler();
+        var accountId = Guid.NewGuid();
+        saveAccount(AccountDomain.Open(accountId, new Money(100m)));
+
+        withdraw(accountId, 100m);
+
+        var account = loadAccount(accountId)!;
+        Assert.Equal(0m, account.Balance.Amount);
+    }
+
+    [Fact]
+    public void Withdrawing_from_a_non_existent_account_throws()
+    {
+        var (withdraw, _, _) = BuildHandler();
+
+        Assert.Throws<InvalidOperationException>(() => withdraw(Guid.NewGuid(), 50m));
+    }
+
+    [Fact]
+    public void Withdrawing_more_than_the_available_balance_returns_InsufficientBalance()
+    {
+        var (withdraw, _, saveAccount) = BuildHandler();
+        var accountId = Guid.NewGuid();
+        saveAccount(AccountDomain.Open(accountId, new Money(50m)));
+
+        var result = withdraw(accountId, 100m);
+
+        Assert.IsType<WithdrawResult.InsufficientBalance>(result);
+    }
+
+    [Fact]
+    public void After_a_failed_withdrawal_the_balance_is_unchanged()
+    {
+        var (withdraw, loadAccount, saveAccount) = BuildHandler();
+        var accountId = Guid.NewGuid();
+        saveAccount(AccountDomain.Open(accountId, new Money(50m)));
+
+        withdraw(accountId, 999m);
+
+        var account = loadAccount(accountId)!;
+        Assert.Equal(50m, account.Balance.Amount);
+    }
+}