On Tue, Dec 16, 2008 at 11:12 AM, Drain, Theodore R
<theodore.r.dr...@jpl.nasa.gov> wrote:
> - Embed a font with the tests to eliminate font server differences (no
> experience with this so I'm not sure how hard this would be). We could even
> create a dummy font that just has black squares for each character - it still
> tests that everything is drawn in the correct place and runs properly and
> eliminates subtle character differences.
Since we ship our own fonts, it is pretty easy to test against a known
set. Just set up the rc to use Vera, and cm* or stix* for math.
> - Create a testing backend that records the drawing commands as a set of
> meta-data like (draw red line from point 1 to point 2). The test case then
> checks that the proper commands were issued by the test script. This
> eliminates drawing completely. A nice comparison suite would allow loose
> comparisons like "make sure a vertical line was drawn from (10,20) to (30,40)
> with a pixel slop of 2 pixels.
I think this idea has promise.
I'll also add that we can do *a lot* more with simple API tests that
do not look at the output but at least make sure the inputs, in all
their variety, are at least accepted. backend_driver does this to an
extent, but I will be adding nose tests for any new features I add.
Eg, for the recent markevery, which can be None, an integer or a
length 2 tuple, I added this simple test to unit/nose_tests
def test_markevery():
x, y = np.random.rand(2, 100)
# check marker only plot
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(x, y, 'o', label='default')
ax.plot(x, y, 'd', markevery=None, label='mark all')
ax.plot(x, y, 's', markevery=10, label='mark every 10')
ax.plot(x, y, '+', markevery=(5, 20), label='mark every 5 starting at 10')
ax.legend()
fig.canvas.draw()
plt.close(fig)
# check line/marker combos
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(x, y, '-o', label='default')
ax.plot(x, y, '-d', markevery=None, label='mark all')
ax.plot(x, y, '-s', markevery=10, label='mark every 10')
ax.plot(x, y, '-+', markevery=(5, 20), label='mark every 5 starting at 10')
ax.legend()
fig.canvas.draw()
plt.close(fig)
Having well defined tests that heavily exercise the frontend API would
be a significant step forward, and the harder question of output
comparison could be added in.
JDH
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