How can I adjust my python unittest module to execute specific actions depending on the outcome of the test? My scenario involves running automated selenium webdriver tests, and I want to be able to take a screenshot in case of any failures or errors.
Defining "how the test ends" is crucial. It's recommended to have one assertion per unit test, typically within a method starting with test_* as dictated by the unittest module. This way, the test concludes once the assertion has been executed.
def test_my_page(self):
try:
self.assertEqual(some_element.field, '42')
except Exception:
# capture screenshot
An alternate approach might be:
class MyTestClass(unittest.TestCase):
def setUp(self):
self.capture_screenshot = False
def tearDown(self):
if self.capture_screenshot:
# use selenium to take screenshot
# and perform additional tasks
def test_my_page(self):
try:
self.assertEqual(some_element.field, '42')
except Exception:
self.capture_screenshot = True
This approach doesn't vary much from the initial one, apart from relocating cleanup actions outside of the test methods.
The key point here is that you must handle exceptions on your own. Unittest won't manage exceptions unless instructed, and if an exception goes unhandled, the tearDown method won't be invoked.
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