75 lines
2.6 KiB
C#
75 lines
2.6 KiB
C#
using System.Linq;
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using NUnit.Framework.Constraints;
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using OrderDomain;
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namespace OrderTests;
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/// <summary>
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/// Custom NUnit matcher that bundles multiple order assertions into one.
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/// Participants: you do not need to understand how this works —
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/// just recognize the pattern and use it as an example for the agent.
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/// </summary>
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public static class Has
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{
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public static IResolveConstraint OrderState(decimal expectedTotal, decimal[] expectedLineValues)
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=> new OrderStateConstraint(expectedTotal, expectedLineValues);
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}
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public class OrderStateConstraint : Constraint
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{
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private readonly decimal _expectedTotal;
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private readonly decimal[] _expectedLineValues;
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public OrderStateConstraint(decimal expectedTotal, decimal[] expectedLineValues)
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{
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_expectedTotal = expectedTotal;
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_expectedLineValues = expectedLineValues;
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}
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public override string Description =>
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$"order with total {_expectedTotal} and line values [{string.Join(", ", _expectedLineValues)}]";
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public override ConstraintResult ApplyTo<TActual>(TActual actual)
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{
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var order = (Order)(object)actual!;
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var actualTotal = order.Total;
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var actualLineValues = order.Lines.Select(l => l.Value).ToArray();
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var details = new List<string>();
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if (actualTotal != _expectedTotal)
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details.Add($"Total: expected {_expectedTotal}, but was {actualTotal}");
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if (!actualLineValues.SequenceEqual(_expectedLineValues))
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details.Add(
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$"Line values: expected [{string.Join(", ", _expectedLineValues)}], " +
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$"but was [{string.Join(", ", actualLineValues)}]");
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return new OrderStateResult(this, actual!, details.Count == 0, details);
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}
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/// <summary>
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/// A ConstraintResult that carries the per-field mismatch details and
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/// writes them as additional lines in the failure message, e.g.
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///
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/// Expected: order with total 210 and line values [160, 50]
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/// But was: <Order>
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/// Total: expected 210, but was 250
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/// Line values: expected [160, 50], but was [200, 50]
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/// </summary>
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private sealed class OrderStateResult : ConstraintResult
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{
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private readonly IReadOnlyList<string> _details;
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public OrderStateResult(Constraint constraint, object? actual, bool isSuccess, IReadOnlyList<string> details)
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: base(constraint, actual, isSuccess)
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{
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_details = details;
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}
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public override void WriteAdditionalLinesTo(MessageWriter writer)
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{
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foreach (var detail in _details)
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writer.WriteMessageLine(detail);
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}
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}
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}
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