unittest：wxpython的事件方法引發異常，但assertRaises不會檢測到它

Question

我有一個wxpython對話框，單擊“確定”按鈕時會引發TypeError異常。 我想用unittest測試異常的發生，但是測試不能按預期工作。 輸出顯示引發了異常。 無論如何，unittest都會通知測試失敗：

"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)

這是我的代碼的簡化示例：

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) )

有人可以幫我找出我做錯了什么嗎？

Answer 1

參見： https : //wiki.wxpython.org/CppAndPythonSandwich

異常不會通過C ++層傳遞到調用堆棧。 當控件從Python返回C ++時，它將檢查是否存在未被捕獲的Python異常，如果是，則打印並清除錯誤。

在單元測試中處理此問題的一種方法是在事件處理程序中捕獲異常，並設置一個標志。 然后返回測試代碼，您可以檢查是否設置了該標志。