Trying to build a Verify integration, but not sure where to start

[nth-commit]

I've been building a property-based testing framework and I've been using some of the primitives it exposes to add an easy way to take snapshots from random data.

For example;

using GalaxyCheck;

namespace IntegrationSample
{
    public class GenSnapshotTests
    {
        public record GeneratedInput(int A, int B, int C);

        public record TestOutput(int Sum);

        [GenSnapshot]
        public TestOutput Addition(GeneratedInput input)
        {
            var result = new TestOuput(input.A + input.B + input.C);

            return result;
        }
    }
}

• GenSnapshotAttribute inherits from Xunit.Fact
• The test method is given random (but deterministic) input data
• The test method returns some output, which I want to snapshot

To do the snapshotting, you need to register some global configuration. This example shows how I was able to integrate with Snapshooter:

using GalaxyCheck.Configuration;
using Snapshooter;
using Snapshooter.Xunit;
using System.IO;
using System.Threading.Tasks;

namespace IntegrationSample
{
    internal class ConfigureGalaxyCheck : IConfigureGlobal
    {
        public void Configure(IGlobalConfiguration config)
        {
            config.GenSnapshots.AssertSnapshotMatches = (snapshot) =>
            {
                var snapshotName = $"{snapshot.TestClassName}.{snapshot.TestMethodName}_{snapshot.Seed}.snap";
                var directoryName = Path.GetDirectoryName(snapshot.TestFileName)!;
                Snapshot.Match(snapshot.Output, new SnapshotFullName(snapshotName, directoryName));
                return Task.CompletedTask;
            };
        }
    }
}

• You register your snapshot tool in the global config, on the delegate Func<ISnapshot, Task>
• The function is responsible for executing the snapshot
• The snapshot structure given to the delegate has file information on it (GenSnapshotAttribute captures the filename of the class)
• For reference, the ISnapshot structure is defined here: https://github.com/nth-commit/GalaxyCheck/blob/a798c9e7fbdecbbc96eaa24d5974a299c4e4849a/src/GalaxyCheck.Xunit/Configuration/IGlobalConfiguration.cs#L29-L42

Is it possible to do something like this with Verify?

I've been looking at how the other integrations are building (e.g. Verify.Xunit), and it seems they are dependent on InnerVerify, which is an internal to the package, and not accessible by a third-party.

[nth-commit]

Bump 🙏

[SimonCropp]

InnerVerify is now public, does that unblock you?

[SimonCropp]

the closes thing to AssertSnapshotMatches is comparers https://github.com/VerifyTests/Verify/blob/main/docs/comparer.md