Java assert double is Nan

I try to assert that my double is Nan

private Double calculateIt(String input){...}

assertEquals(Double.NaN,calculateIt("input text"));

The code is not compiled, double Nan is defined as original

public static final double NaN = 0.0d / 0.0;

To make assertions work, I wrap Nan with a Na object

assertEquals(new Double(Double.NaN),calculateIt("input text"));

Is there a shorter way to do this?

Solution

You can use:

boolean isNan = Double.isNaN(calculateIt("input text"));
assertTrue(isNan);

Double. The Nan value cannot be compared with = = (double. Nan = = double. Nan will return false) because Nan is considered a special value

More information:

> IEEE floating point