### Question:
FourierTransform { public static int getPowerOfTwoSize(int initialSize) { double log_of_initialSize_to_base_2 = Math.log(initialSize) / Math.log(2); return (int) Math.pow(2, Math.ceil(log_of_initialSize_to_base_2)); } FourierTransform(WindowType windowType, double parameter);  FourierTransform(WindowType windowType);  FourierTransform(); Complex[] forwardFFT(double[] signal); double[] inverseFFT(Complex[] fft); static int getPowerOfTwoSize(int initialSize); static double[] padWithZeroIfNecessary(double[] signal); static double[] getFrequencies(double[] signal, double samplingFrequency); double[] calculatePowerSpectrum(double[] samples);  }### Answer:
@Test public void testGetPowerOfTwoSize() { int actual = FourierTransform.getPowerOfTwoSize(13); assertEquals(16, actual); assertEquals(256, FourierTransform.getPowerOfTwoSize(256)); }