public int SteinGCDTest(params int[] array) => GCDMethods.SteinGCD(array);
public void SteinGCDTest_AcceptsEmptyArray_ThrowsException(params int[] array) => Assert.Throws <ArgumentNullException>(() => GCDMethods.SteinGCD(array));
public int EuclidGCDTest(params int[] array) => GCDMethods.EuclidGCD(array);