Various fixes for tests in scripts/plot plot/cla.m: Use figure number 1232. plot/clf.m: Split test into two. plot/findall.m: Check only for graphic objects in figure 1232. plot/findall.m: Ditto. plot/gcf.m: Simplify test. plot/line.m: Check against default values now. plot/whitebg.m: Restore default values after tests.

function h = plot(p, varargin)
  n = 128;
  rmax = max (abs (roots (p.poly)));
  x = [0 : (n - 1)] / (n - 1) * 2.2 * rmax - 1.1 * rmax;
  if (nargout > 0)
    h = plot(x, p(x), varargin{:});
  else
    plot(x, p(x), varargin{:});
  endif
endfunction