public void TestAtanh(long x, long expected)
{
var result = BitConverter.DoubleToInt64Bits(MathEx.Atanh(BitConverter.Int64BitsToDouble(x)));
var delta = Math.Abs(expected - result);
if (delta > 2)
{
Assert.Fail($"result={result}, expected={expected}, delta={delta}");
}
else
{
Assert.IsTrue(true);
}
}