Question

我有一个wxpython对话框，在单击“确定”按钮时会引发TypeError异常。我想用unittest测试异常的发生但测试不能按预期工作。输出显示异常被引发。无论如何unittest通知测试失败：

"C:\Program Files (x86)\Python\python.exe" test.py
Traceback (most recent call last):
  File "test.py", line 22, in on_ok
    raise TypeError( 'TypeError raised' )
TypeError: TypeError raised
F
======================================================================
FAIL: test_should_raise (__main__.CDlgTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test.py", line 34, in test_should_raise
    self._dut.m_button_ok.GetEventHandler().ProcessEvent( event )
AssertionError: TypeError not raised

----------------------------------------------------------------------
Ran 1 test in 0.005s

FAILED (failures=1)

以下是我的代码的简化示例：

import unittest
import wx

class CDlgBase ( wx.Dialog ):
    """The UI"""
    def __init__( self, parent ):
        wx.Dialog.__init__ ( self, parent )
        bSizerTest = wx.BoxSizer( wx.VERTICAL )
        self.m_button_ok = wx.Button( self, wx.ID_ANY )
        bSizerTest.Add( self.m_button_ok, 0 )
        self.SetSizer( bSizerTest )
        # Connect Events
        self.m_button_ok.Bind( wx.EVT_BUTTON, self.on_ok )
    def on_ok( self, event ):
        event.Skip()

class CDlg( CDlgBase ) :
    """The dialog"""
    def __init__(self, parent):
        super( CDlg, self).__init__(parent)
    def on_ok(self, event):
        # The exception should be verified in the test `test_should_raise()`.
        raise TypeError( 'TypeError raised' )

class CDlgTest( unittest.TestCase ) :
    """The test class"""
    def setUp(self):
        self._dut = CDlg(None)
    def test_should_raise(self):
        """The test to verify raising the TypeError exception in the event 
        method `on_ok()`. this is the test method wich works not as expected."""
        event = wx.CommandEvent( wx.EVT_BUTTON.evtType[0] )
        event.SetEventObject( self._dut.m_button_ok )
        with self.assertRaises( TypeError ) :
            """Simulate an "OK" click. `on_ok()` will be executed 
            and raises the TypeError exception."""
            self._dut.m_button_ok.GetEventHandler().ProcessEvent( event )

if __name__ == '__main__':
    app = wx.App()
    tests = [ unittest.TestLoader().loadTestsFromTestCase( CDlgTest) ]
    unittest.TextTestRunner(verbosity=2, failfast=True).run(unittest.TestSuite(tests) )

有人可以帮助我找出我做错了吗？

Answer 1

请参阅：https://wiki.wxpython.org/CppAndPythonSandwich

异常不通过C ++层传递给调用堆栈。当控制从Python返回到C ++时，它会检查是否存在未捕获的Python异常，如果是，则打印然后清除错误。

在单元测试中处理此问题的一种方法是在事件处理程序中捕获异常并设置标志。然后回到测试代码中，您可以检查是否设置了该标志。

unittest：wxpython的event方法引发异常，但assertRaises没有检测到它

1 个答案: