Current File : //proc/self/root/lib/python3/dist-packages/matplotlib/tests/test_backend_tk.py
import functools
import inspect
import os
import platform
import re
import subprocess
import sys
import pytest
_test_timeout = 60 # A reasonably safe value for slower architectures.
def _isolated_tk_test(success_count, func=None):
"""
A decorator to run *func* in a subprocess and assert that it prints
"success" *success_count* times and nothing on stderr.
TkAgg tests seem to have interactions between tests, so isolate each test
in a subprocess. See GH#18261
The decorated function must be fully self-contained, and thus perform
all the imports it needs. Because its source is extracted and run by
itself, coverage will consider it as not being run, so it should be marked
with ``# pragma: no cover``
"""
if func is None:
return functools.partial(_isolated_tk_test, success_count)
# Remove decorators.
source = re.search(r"(?ms)^def .*", inspect.getsource(func)).group(0)
@functools.wraps(func)
def test_func():
try:
proc = subprocess.run(
[sys.executable, "-c", f"{source}\n{func.__name__}()"],
env={**os.environ, "MPLBACKEND": "TkAgg"},
timeout=_test_timeout,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
check=True,
universal_newlines=True,
)
except subprocess.TimeoutExpired:
pytest.fail("Subprocess timed out")
except subprocess.CalledProcessError:
pytest.fail("Subprocess failed to test intended behavior")
else:
# macOS may actually emit irrelevant errors about Accelerated
# OpenGL vs. software OpenGL, so suppress them.
# Asserting stderr first (and printing it on failure) should be
# more helpful for debugging that printing a failed success count.
assert not [line for line in proc.stderr.splitlines()
if "OpenGL" not in line]
assert proc.stdout.count("success") == success_count
return test_func
@pytest.mark.backend('TkAgg', skip_on_importerror=True)
@_isolated_tk_test(success_count=6) # len(bad_boxes)
def test_blit(): # pragma: no cover
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.backends import _tkagg
fig, ax = plt.subplots()
photoimage = fig.canvas._tkphoto
data = np.ones((4, 4, 4))
height, width = data.shape[:2]
dataptr = (height, width, data.ctypes.data)
# Test out of bounds blitting.
bad_boxes = ((-1, 2, 0, 2),
(2, 0, 0, 2),
(1, 6, 0, 2),
(0, 2, -1, 2),
(0, 2, 2, 0),
(0, 2, 1, 6))
for bad_box in bad_boxes:
try:
_tkagg.blit(
photoimage.tk.interpaddr(), str(photoimage), dataptr, 0,
(0, 1, 2, 3), bad_box)
except ValueError:
print("success")
@pytest.mark.backend('TkAgg', skip_on_importerror=True)
@_isolated_tk_test(success_count=1)
def test_figuremanager_preserves_host_mainloop(): # pragma: no cover
import tkinter
import matplotlib.pyplot as plt
success = []
def do_plot():
plt.figure()
plt.plot([1, 2], [3, 5])
plt.close()
root.after(0, legitimate_quit)
def legitimate_quit():
root.quit()
success.append(True)
root = tkinter.Tk()
root.after(0, do_plot)
root.mainloop()
if success:
print("success")
@pytest.mark.skipif(platform.python_implementation() != 'CPython',
reason='PyPy does not support Tkinter threading: '
'https://foss.heptapod.net/pypy/pypy/-/issues/1929')
@pytest.mark.backend('TkAgg', skip_on_importerror=True)
@pytest.mark.flaky(reruns=3)
@_isolated_tk_test(success_count=1)
def test_figuremanager_cleans_own_mainloop(): # pragma: no cover
import tkinter
import time
import matplotlib.pyplot as plt
import threading
from matplotlib.cbook import _get_running_interactive_framework
root = tkinter.Tk()
plt.plot([1, 2, 3], [1, 2, 5])
def target():
while not 'tk' == _get_running_interactive_framework():
time.sleep(.01)
plt.close()
if show_finished_event.wait():
print('success')
show_finished_event = threading.Event()
thread = threading.Thread(target=target, daemon=True)
thread.start()
plt.show(block=True) # Testing if this function hangs.
show_finished_event.set()
thread.join()
@pytest.mark.backend('TkAgg', skip_on_importerror=True)
@pytest.mark.flaky(reruns=3)
@_isolated_tk_test(success_count=0)
def test_never_update(): # pragma: no cover
import tkinter
del tkinter.Misc.update
del tkinter.Misc.update_idletasks
import matplotlib.pyplot as plt
fig = plt.figure()
plt.show(block=False)
plt.draw() # Test FigureCanvasTkAgg.
fig.canvas.toolbar.configure_subplots() # Test NavigationToolbar2Tk.
# Check for update() or update_idletasks() in the event queue, functionally
# equivalent to tkinter.Misc.update.
# Must pause >= 1 ms to process tcl idle events plus extra time to avoid
# flaky tests on slow systems.
plt.pause(0.1)
plt.close(fig) # Test FigureCanvasTk filter_destroy callback
# Note that exceptions would be printed to stderr; _isolated_tk_test
# checks them.
@pytest.mark.backend('TkAgg', skip_on_importerror=True)
@_isolated_tk_test(success_count=2)
def test_missing_back_button(): # pragma: no cover
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import NavigationToolbar2Tk
class Toolbar(NavigationToolbar2Tk):
# Only display the buttons we need.
toolitems = [t for t in NavigationToolbar2Tk.toolitems if
t[0] in ('Home', 'Pan', 'Zoom')]
fig = plt.figure()
print("success")
Toolbar(fig.canvas, fig.canvas.manager.window) # This should not raise.
print("success")
Mini Shell