A moq macher for deeply comparing objects.

ItIs.cs

public static class ItIs
{
    public static T EquivalentTo<T>(T expected)
    {
        return EquivalentTo(expected, config => config);
    }

    public static T EquivalentTo<T>(T expected, Func<EquivalencyAssertionOptions<T>, EquivalencyAssertionOptions<T>> config)
    {
        bool Validate(T actual)
        {
            try
            {
                actual.Should().BeEquivalentTo(expected, config);

                return true;
            }
            catch (Exception)
            {
                false;
            }
        }

        return Match.Create<T>(Validate);
    }
}

SampleTest.cs

public class SampleTest
{
    [Fact]
    public void LoggerShouldBeOutputWhenSavingForm()
    {
        var logger = new Mock<ILogger>();
        var service = new Service(logger.Object);
        var formValues = new FormValues
        {
            Foo = "FOO",
            Bar = "BAR",
            Baz = "BAZ"
        };
        
        service.SaveFormValues(formValues);
        
        var expected = new LogItem
        {
            LogNo = 1,
            LogLevel = LogLevel.Info,
            FormValues = JsonSerializer.Serialize(formValues),
        };
        logger.Verify(mock => mock.Log(ItIs.EquivalentTo(expected)));
    }
}