/// <summary>
/// Verify matches naive complex.
/// </summary>
static void VerifyMatchesNaiveComplex(
Complex[] samples,
int maximumErrorDecimalPlaces,
Func<Complex[], Complex[]> naive,
Action<Complex[]> fast)
{
var spectrumNaive = naive(samples);
var spectrumFast = new Complex[samples.Length];
samples.CopyTo(spectrumFast, 0);
fast(spectrumFast);
AssertHelpers.ListAlmostEqual(spectrumNaive, spectrumFast, maximumErrorDecimalPlaces);
}