def error_and_exit(title, main_text):
"""
Show a pop-up window and sys.exit() out of Python.
:param title: the short error description
:param main_text: the long error description
"""
show_system_popup(title, main_text)
# Exit the program
sys.exit(1)
def test_show_system_popup_win():
# in this test "double mocking techniques" has been applied
# there are different mocks that will work depending on the target machine's OS
#
# In case of *nix machine, "@patch_import(modules=['win32api'], MessageBox=MagicMock())" will work.
# In case of win machine, "with patch('win32api.MessageBox'):" will work.
#
# No matter what kind of Mock was used, the line "win32api.MessageBox.assert_called_once()" should work.
#
# This approach also applies to the test functions below.
import win32api
with patch('win32api.MessageBox'): # this patch starts to work only in case win32api exists on the target machine
show_system_popup('title', 'text')
win32api.MessageBox.assert_called_once_with(0, 'text', 'title')
def test_show_system_popup_darwin():
import subprocess
with patch('subprocess.Popen'):
show_system_popup('title', 'text')
subprocess.Popen.assert_called_once_with(['/usr/bin/osascript', '-e', 'text'])
def test_show_system_popup_linux():
import subprocess
with patch('subprocess.Popen'):
show_system_popup('title', 'text')
subprocess.Popen.assert_called_once_with(['xmessage', '-center', 'text'])
def test_show_system_popup_exception(mocked_print):
with patch('subprocess.Popen', new=MagicMock(side_effect=ValueError)):
show_system_popup('title', 'text')
last_call_args = mocked_print.call_args_list[-1]
last_argument = last_call_args.args[0]
assert last_argument.startswith('Error while')
def test_show_system_popup_unknown(mocked_print):
show_system_popup('title', 'text')
mocked_print.assert_called_with('cannot create native pop-up for system Unknown')