我构建了一个 wx python 应用程序，它运行一个后台线程来执行一些计算。但是，我当前的实现不允许进行单元测试。
我非常接近本教程中第一个示例的实现：http ://wiki.wxpython.org/LongRunningTasks
下面的代码使用wx.PostEvent()并frame.connect()让注册一个结果事件到主框架，这表明计算已经完成。我还展示了一段单元测试代码。
但是，要捕获线程结果事件，wx.App.MainLoop()必须启动。但是，我不知道如何在单元测试中模拟这种行为。
我对 GUI 单元测试的理解一般是手动模拟事件。但是在这种情况下，我想让我的后台线程运行。我应该修改实现吗？或者为了单元测试的目的，我可以以其他方式存根计算线程吗？例如，我是否应该在单元测试代码中运行线程，然后一旦完成，调用 GUI 代码直接处理此事件？
import time
from threading import *
import unittest
import wx
# Button definitions
ID_START = wx.NewId()
ID_STOP = wx.NewId()
# Define notification event for thread completion
EVT_RESULT_ID = wx.NewId()
def EVT_RESULT(win, func):
"""Define Result Event."""
win.Connect(-1, -1, EVT_RESULT_ID, func)
class ResultEvent(wx.PyEvent):
"""Simple event to carry arbitrary result data."""
def __init__(self, data):
"""Init Result Event."""
wx.PyEvent.__init__(self)
self.SetEventType(EVT_RESULT_ID)
self.data = data
print "inside result event"
class WorkerThread(Thread):
"""Worker Thread Class."""
def __init__(self, notify_window, delay):
"""Init Worker Thread Class."""
Thread.__init__(self)
self._notify_window = notify_window
self._want_abort = 0
self._delay = delay
self.start()
def run(self):
"""Run Worker Thread."""
for i in range(self._delay):
print "thread running..."
time.sleep(1)
if self._want_abort:
# Use a result of None to acknowledge the abort (of
# course you can use whatever you'd like or even
# a separate event type)
wx.PostEvent(self._notify_window, ResultEvent(None))
return
wx.PostEvent(self._notify_window, ResultEvent("My result"))
def abort(self):
"""abort worker thread."""
self._want_abort = 1
class MainFrame(wx.Frame):
"""Class MainFrame."""
def __init__(self, parent, id):
"""Create the MainFrame."""
wx.Frame.__init__(self, parent, id, 'Thread Test')
# Dumb sample frame with two buttons
wx.Button(self, ID_START, 'Start', pos=(0,0))
wx.Button(self, ID_STOP, 'Stop', pos=(0,50))
self.status = wx.StaticText(self, -1, '', pos=(0,100))
self.Bind(wx.EVT_BUTTON, self.OnStart, id=ID_START)
self.Bind(wx.EVT_BUTTON, self.OnStop, id=ID_STOP)
# Set up event handler for any worker thread results
EVT_RESULT(self,self.OnResult)
self.worker = None
self.thread_running = False
def OnStart(self, event):
"""Start Computation."""
print "OnStart"
self.thread_running = True
if not self.worker:
self.status.SetLabel('Starting computation')
self.worker = WorkerThread(self, 3)
def OnStop(self, event):
"""Stop Computation."""
print "OnStop"
if self.worker:
self.status.SetLabel('Trying to abort computation')
self.worker.abort()
else:
print "no worker"
def OnResult(self, event):
"""Show Result status."""
# NEVER GETS INSIDE HERE!
print "ON RESULT"
self.thread_running = False
if event.data is None:
self.status.SetLabel('Computation aborted')
else:
self.status.SetLabel('Computation Result: %s' % event.data)
self.worker = None
class MainApp(wx.App):
"""Class Main App."""
def OnInit(self):
"""Init Main App."""
self.frame = MainFrame(None, -1)
self.frame.Show(True)
self.SetTopWindow(self.frame)
return True
class TestGui(unittest.TestCase):
def setUp(self):
print "set up"
self.app = MainApp(0)
self.frame = self.app.frame
# Need MainLoop to capture ResultEvent, but how to test?
# self.app.MainLoop()
def tearDown(self):
print "tear down"
self.frame.Destroy()
def test1(self):
self.assertTrue(self.frame.worker is None)
self.assertEquals(self.frame.thread_running, False)
self.frame.OnStart(None)
self.assertTrue(self.frame.worker is not None)
self.assertEquals(self.frame.thread_running, True)
while self.frame.thread_running:
print 'waiting...'
time.sleep(.5)
# NEVER EXITS!
self.assertTrue(self.frame.worker is None)
def suite():
suite = unittest.makeSuite(TestGui, 'test')
return suite
if __name__ == '__main__':
unittest.main(defaultTest='suite')