单元测试框架:在新进程中运行测试

Question

我编写了一个使用单元测试框架的GUI应用程序。应用程序在树状视图中显示所有找到的单元测试。如果单击单元测试名称，程序将运行该测试并显示结果。它的工作原理!

但是现在我想让每个测试用例在一个新的进程中运行。我创建了一个"工作线程"(与模块线程)，但这个线程也在同一进程中运行。

模块"多处理"是解决方案，但我得到了我的实现问题。我把我的"测试执行代码"放在一个自己的函数中，并尝试:

item = self.GetSelection()
name = self.GetItemText(item)
p = multiprocessing.Process(target=ExecuteTest, args=(name, item))
p.daemon = True
p.start()

但是我得到了错误。

Traceback (most recent call last):
  File "C:abchhha.py", line 577, in OnLeftDClick
    p.start()
  File "C:Python26libmultiprocessingprocess.py", line 104, in start
    self._popen = Popen(self)
  File "C:Python26libmultiprocessingforking.py", line 239, in __init__
    dump(process_obj, to_child, HIGHEST_PROTOCOL)
  File "C:Python26libmultiprocessingforking.py", line 162, in dump
    ForkingPickler(file, protocol).dump(obj)
  File "C:Python26libpickle.py", line 224, in dump
    self.save(obj)
  File "C:Python26libpickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:Python26libpickle.py", line 419, in save_reduce
    save(state)
  File "C:Python26libpickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:Python26libpickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "C:Python26libpickle.py", line 681, in _batch_setitems
    save(v)
  File "C:Python26libpickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:Python26libpickle.py", line 548, in save_tuple
    save(element)
  File "C:Python26libpickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:Python26libpickle.py", line 419, in save_reduce
    save(state)
  File "C:Python26libpickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:Python26libpickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "C:Python26libpickle.py", line 686, in _batch_setitems
    save(v)
  File "C:Python26libpickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:Python26libpickle.py", line 396, in save_reduce
    save(cls)
  File "C:Python26libpickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:Python26libpickle.py", line 748, in save_global
    (obj, module, name))
pickle.PicklingError: Can't pickle <type 'PySwigObject'>: it's not found as __builtin__.PySwigObject
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:Python26libmultiprocessingforking.py", line 342, in main
    self = load(from_parent)
  File "C:Python26libpickle.py", line 1370, in load
    return Unpickler(file).load()
  File "C:Python26libpickle.py", line 858, in load
    dispatch[key](self)
  File "C:Python26libpickle.py", line 880, in load_eof
    raise EOFError
EOFError

有人知道吗?

Answer 1

显然，您正在尝试"pickle"不可拾取的东西(似乎是一个wx对象)。尝试只使用"简单"对象作为参数(即内部没有图形对象)，它应该工作得更好。您还可以看看python nose unitest库，它允许您在多进程中自动运行测试。

Answer 2

我建议您创建一个单独的脚本来运行测试，然后您可以使用subprocess模块调用该脚本，为其提供要运行的测试的名称。

好处是，您可以在持续集成服务器、夜间构建或其他不需要GUI的批处理类型进程中使用相同的脚本。

使用fork生成一个子进程。这将需要您做一些工作，但将工作。

注意:multiprocessing模块是使用fork实现的。

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Update:仔细查看您的代码后，似乎item变量是不可pickle的(这是一个词吗?)。我认为您不需要它，因为您可以用更简单的东西(值或其他类型)替换它。