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"""

Backend-loading machinery tests, using variations on the template backend.

"""

import sys

from types import SimpleNamespace

from unittest.mock import MagicMock

import matplotlib as mpl

from matplotlib import pyplot as plt

from matplotlib.backends import backend_template

from matplotlib.backends.backend_template import (

FigureCanvasTemplate, FigureManagerTemplate)

def test_load_template():

mpl.use("template")

assert type(plt.figure().canvas) == FigureCanvasTemplate

def test_load_old_api(monkeypatch):

mpl_test_backend = SimpleNamespace(**vars(backend_template))

mpl_test_backend.new_figure_manager = (

lambda num, *args, FigureClass=mpl.figure.Figure, **kwargs:

FigureManagerTemplate(

FigureCanvasTemplate(FigureClass(*args, **kwargs)), num))

monkeypatch.setitem(sys.modules, "mpl_test_backend", mpl_test_backend)

mpl.use("module://mpl_test_backend")

assert type(plt.figure().canvas) == FigureCanvasTemplate

plt.draw_if_interactive()

def test_show(monkeypatch):

mpl_test_backend = SimpleNamespace(**vars(backend_template))

mock_show = MagicMock()

monkeypatch.setattr(

mpl_test_backend.FigureManagerTemplate, "pyplot_show", mock_show)

monkeypatch.setitem(sys.modules, "mpl_test_backend", mpl_test_backend)

mpl.use("module://mpl_test_backend")

plt.show()

mock_show.assert_called_with()

def test_show_old_global_api(monkeypatch):

mpl_test_backend = SimpleNamespace(**vars(backend_template))

mock_show = MagicMock()

monkeypatch.setattr(mpl_test_backend, "show", mock_show, raising=False)

monkeypatch.setitem(sys.modules, "mpl_test_backend", mpl_test_backend)

mpl.use("module://mpl_test_backend")

plt.show()

mock_show.assert_called_with()

def test_load_case_sensitive(monkeypatch):

mpl_test_backend = SimpleNamespace(**vars(backend_template))

mock_show = MagicMock()

monkeypatch.setattr(

mpl_test_backend.FigureManagerTemplate, "pyplot_show", mock_show)

monkeypatch.setitem(sys.modules, "mpl_Test_Backend", mpl_test_backend)

mpl.use("module://mpl_Test_Backend")

plt.show()

mock_show.assert_called_with()