python - Test if ValidationError was raised -

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i want test if exception raised how can that?

in models.py have function, 1 want test:

  def validate_percent(value):     if not (value >= 0 , value <= 100):       raise validationerror('error')

in tests.py tried this:

def test_validate_percent(self):     self.assertraises(validationerror, validate_percent(1000))

the output of test is:

..e ====================================================================== error: test_validate_percent (tm.tests.models.helpers.helperstestcase) ---------------------------------------------------------------------- traceback (most recent call last):   file "/...py", line 21, in test_validate_percent     self.assertraises(validationerror, validate_percent(1000))   file "/....py", line 25, in validate_percent     raise validationerror(u'error' % value) validationerror: ['error']

assertraises used context manager:

def test_validate_percent(self):     self.assertraises(validationerror):         validate_percent(1000)

or callable:

def test_validate_percent(self):     self.assertraises(validationerror, validate_percent, 1000)

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