recyclarr/src/TestLibrary/NSubstitute/Verify.cs

using System.Diagnostics;
using FluentAssertions.Execution;
using NSubstitute.Core.Arguments;

namespace TestLibrary.NSubstitute;

// Interface changes in IArgumentMatcher make nullability difficult
// to deal with. So we just ignore that here for now.
#nullable disable

public static class Verify
{
    public static T That<T>(Action<T> action)
    {
        return ArgumentMatcher.Enqueue(new AssertionMatcher<T>(action));
    }

    private class AssertionMatcher<T> : IArgumentMatcher<T>
    {
        private readonly Action<T> _assertion;

        public AssertionMatcher(Action<T> assertion)
        {
            _assertion = assertion;
        }

        public bool IsSatisfiedBy(T argument)
        {
            using var scope = new AssertionScope();
            _assertion(argument);

            var failures = scope.Discard().ToList();
            if (failures.Count == 0)
            {
                return true;
            }

            failures.ForEach(x => Trace.WriteLine(x));
            return false;
        }
    }
}