49 lines
1.7 KiB
C#
49 lines
1.7 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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{
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return new OrderStateConstraint(expectedTotal, expectedLineValues);
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}
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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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: base($"order with total {expectedTotal} and line values [{string.Join(", ", expectedLineValues)}]")
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{
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_expectedTotal = expectedTotal;
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_expectedLineValues = expectedLineValues;
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}
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public override ConstraintResult ApplyTo<TActual>(TActual actual)
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{
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var order = (Order)(object)actual!;
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var actualTotal = order.Total;
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var actualLineValues = order.Lines.Select(l => l.Value).ToArray();
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var totalMatch = actualTotal == _expectedTotal;
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var linesMatch = actualLineValues.SequenceEqual(_expectedLineValues);
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var messages = new List<string>();
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if (!totalMatch)
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messages.Add($"Total: expected {_expectedTotal}, got {actualTotal}");
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if (!linesMatch)
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messages.Add($"Line values: expected [{string.Join(", ", _expectedLineValues)}], got [{string.Join(", ", actualLineValues)}]");
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return new ConstraintResult(this, actual, totalMatch && linesMatch);
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}
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} |