unit_test_equals("zero order divided_difference_coefficients", ...
		 [1], ...
		 divided_difference_coefficients([0]));

unit_test_equals("first order divided_difference_coefficients", ...
		 [-1, 1] / pi, ...
		 divided_difference_coefficients([0, pi]));

unit_test_equals("second order divided_difference_coefficients", ...
		 [1, -2, 1] / (2*pi^2), ...
		 divided_difference_coefficients([0, pi, 2*pi]));
