public void TestInverseRealFft()
{
float[] array = { 1, 5, 3, 7, 2, 3, 0, 7 };
float[] output = new float[array.Length];
float[] outputNorm = new float[array.Length];
float[] re = new float[5];
float[] im = new float[5];
var realFft = new RealFft(8);
realFft.Direct(array, re, im);
realFft.Inverse(re, im, output);
realFft.InverseNorm(re, im, outputNorm);
Assert.Multiple(() =>
{
Assert.That(output, Is.EqualTo(array.Select(a => a * 8)).Within(1e-5));
Assert.That(outputNorm, Is.EqualTo(array).Within(1e-5));
});
}