Oli Sturm
82 lines
3.3 KiB
C#
82 lines
3.3 KiB
C#
using CsharpFp3.Domain;
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using CsharpFp3.Library;
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namespace CsharpFp3.Tests;
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/// Tests covering domain-layer invariants on the Account aggregate directly,
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/// independent of the application layer.
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public class AccountTests
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{
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[Fact]
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public void Opening_an_account_with_a_negative_balance_returns_OpeningBalanceMustBeNonNegative()
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{
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var result = AccountDomain.Open(Guid.NewGuid(), new Money(-1m));
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Assert.True(result.Match(_ => false, e => e is AccountError.OpeningBalanceMustBeNonNegative));
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}
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[Fact]
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public void Withdrawing_a_zero_amount_returns_AmountMustBePositive()
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{
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var accountResult = AccountDomain.Open(Guid.NewGuid(), new Money(100m));
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var account = accountResult.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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var result = AccountDomain.Withdraw(account, new Money(0m));
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Assert.True(result.Match(_ => false, e => e is AccountError.AmountMustBePositive));
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}
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[Fact]
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public void Withdrawing_a_negative_amount_returns_AmountMustBePositive()
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{
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var accountResult = AccountDomain.Open(Guid.NewGuid(), new Money(100m));
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var account = accountResult.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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var result = AccountDomain.Withdraw(account, new Money(-10m));
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Assert.True(result.Match(_ => false, e => e is AccountError.AmountMustBePositive));
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}
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[Fact]
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public void Withdrawing_more_than_the_balance_returns_InsufficientBalance()
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{
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var accountResult = AccountDomain.Open(Guid.NewGuid(), new Money(100m));
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var account = accountResult.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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var result = AccountDomain.Withdraw(account, new Money(101m));
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Assert.True(result.Match(_ => false, e => e is AccountError.InsufficientBalance));
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}
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[Fact]
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public void InsufficientBalance_error_reports_the_current_balance_and_attempted_amount()
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{
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var accountResult = AccountDomain.Open(Guid.NewGuid(), new Money(100m));
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var account = accountResult.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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var result = AccountDomain.Withdraw(account, new Money(150m));
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var error = result.Match(
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_ => throw new InvalidOperationException("Expected failure"),
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e => e is AccountError.InsufficientBalance ins ? ins : throw new InvalidOperationException("Expected InsufficientBalance")
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);
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Assert.Equal(100m, error.Balance.Amount);
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Assert.Equal(150m, error.Amount.Amount);
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}
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[Fact]
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public void Successive_withdrawals_are_each_applied_to_the_running_balance()
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{
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var accountResult = AccountDomain.Open(Guid.NewGuid(), new Money(300m));
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var account = accountResult.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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var result1 = AccountDomain.Withdraw(account, new Money(100m));
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var updatedAccount1 = result1.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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var result2 = AccountDomain.Withdraw(updatedAccount1, new Money(100m));
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var updatedAccount2 = result2.Match(v => v, _ => throw new InvalidOperationException("Expected success"));
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Assert.Equal(100m, updatedAccount2.Balance.Amount);
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}
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}
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