If you are using python2.7 or above you can use the ability of assertRaises to be use as a context manager and do:. To see how this might work, here is a sample implementation of assertRaises that can be called in the same way. Python unittest: assertTrue is truthy, assertFalse is falsy - Posted May 12, 2016 In this post, I explore the differences between the unittest boolean assert methods assertTrue and assertFalse and the assertIs identity assertion. So, I'd like to improve Robert's Rossney answer: You can also send information like a message with the assert statement for a better understanding of the fault of the code. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. If you want to set parameters for the call, you pass those parameters to assertRaises as a *args tuple (and/or a **kwargs dictionary). You must read Python Assert Statements assertRaisesRegex()- Tests that regex matches on the string representation of the exception raised; similar to assertRaises(). Try: def test_directions(self): self.assertRaises(TypeError, nmea_to_dd, ('5132.0000', 'A')) Note the extra comma after nmea_to_dd. with self.assertRaises(TypeError): self.testListNone[:1] If you are using python2.6 another way beside the one given until now is to use unittest2 which is a back port of unittest new feature to python2.6, and you can make it work using the code above. assert condition, message. If you want to simulate or debug your code like what is happening in which stage, then you can use the python assert statements in your code. This allows you to use the idiomatic python constructs without boilerplate code while not losing introspection information. Note that it is not implemented exactly in this way in the unittest module. We can try it in the above call and the test will pass, as expected. Python unittest Assertions Enjoy this cheat sheet at its fullest within Dash, the macOS documentation browser.. mkelley33 gives nice answer, but this approach can be detected as issue by some code analysis tools like Codacy.The problem is that it doesn't know that assertRaises can be used as context manager and it reports that not all arguments are passed to assertRaises method.. However, if you specify a message with the assertion like this: assert a % 2 == 0, "value was odd, should be even" Assertions Python testing framework provides the following assertion methods to check that exceptions are raised. assertRaises()-Tests that Python raises an exception when we call the callable with positional/ keyword arguments we also passed to this method. Messages (15) msg124675 - Author: R. David Murray (r.david.murray) * Date: 2010-12-26 19:18; assertRaises used as a method can't take a msg keyword argument because all args and keywords are passed to the callable. next is the function we want to call and iter([]) are the arguments to this function. Python Assert Example. assertRaises(exception, callable, *args, **kwds) Test that an exception (first argument) is raised when a function is called with any positional or keyword arguments. Dismiss Join GitHub today. This note has some suggestions on good ways to use it. Python's assert statement helps you find bugs more quickly and with less pain. Here are some observations about debugging: Practically all software has some bugs; it's a matter of frequency and severity rather than absolute perfection. Same way losing introspection information work, here is a sample implementation of assertRaises that can be in. Has some suggestions on good ways to use it this note has some suggestions good... 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