test_GraphicsGeneral.py

#!/usr/bin/env python
# Copyright 2001 by Brad Chapman.  All rights reserved.
# This code is part of the Biopython distribution and governed by its
# license.  Please see the LICENSE file that should have been included
# as part of this package.
"""Test for graphics things that don't really deserve there own test module.

XXX Right now this test occasionally fails with a trace like:

File "/usr/local/lib/python2.1/site-packages/reportlab/graphics/
charts/lineplots.py", line 182, in calcPositions
    datum = self.data[rowNo][colNo] # x,y value
IndexError: list index out of range

This appears to be a problem with reportlab, so I'm not worrying about
it right now, unless it starts to happen with real data! If anyone
can figure out the data that causes it so I can avoid it, that'd be much
appreciated.
"""
# standard library
import os
import random
import unittest

from Bio import MissingExternalDependencyError
try:
    # Skip the test if reportlab is not installed
    import reportlab as r
    del r
except:
    raise MissingExternalDependencyError(
        "Install reportlab if you want to use Bio.Graphics.")

# the stuff we're testing
from Bio.Graphics.Comparative import ComparativeScatterPlot


class ComparativeTest(unittest.TestCase):
    """Do tests for modules involved with comparing data.
    """
    def setUp(self):
        self.min_two_d_lists = 1
        self.max_two_d_lists = 7

        self.min_num_points = 1
        self.max_num_points = 500

        self.min_point_num = 0
        self.max_point_num = 200

    def _make_random_points(self):
        """Make a bunch of random points for testing plots.
        """
        plot_info = []
        num_two_d_lists = random.randrange(self.min_two_d_lists,
                                           self.max_two_d_lists)

        for two_d_list in range(num_two_d_lists):
            cur_list = []
            num_points = random.randrange(self.min_num_points,
                                          self.max_num_points)
            for point in range(num_points):
                x_point = random.randrange(self.min_point_num,
                                           self.max_point_num)
                y_point = random.randrange(self.min_point_num,
                                           self.max_point_num)

                cur_list.append((x_point, y_point))

            plot_info.append(cur_list)
        return plot_info

    def test_simple_scatter_plot(self):
        """Test creation of a simple ScatterPlot.
        """
        compare_plot = ComparativeScatterPlot()
        compare_plot.display_info = self._make_random_points()

        output_file = os.path.join(os.getcwd(), "Graphics", "scatter_test.pdf")
        try:
            compare_plot.draw_to_file(output_file, "Testing Scatter Plots")
        # there is a bug in reportlab which occasionally generates an
        # error here.
        except IndexError:
            pass

if __name__ == "__main__":
    runner = unittest.TextTestRunner(verbosity=2)
    unittest.main(testRunner=runner)