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After submitting queries to a service, I get a dictionary or a list back and I want to make sure it's not empty. I using Python 2.7.
I am surprised of not having any assertEmpty method for the unittest.TestCase class instance.
The existing alternatives just don't look right:
self.assertTrue(bool(d)) self.assertNotEqual(d,{}) self.assertGreater(len(d),0) Is this kind of a missing method in the Python unittest framework? If yes, what would be the most pythonic way to assert that an iterable is not empty?
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Empty lists are considered False in Python, hence the bool() function would return False if the list was passed as an argument. Other methods you can use to check if a list is empty are placing it inside an if statement, using the len() methods, or comparing it with an empty list.
assertIsInstance() in Python is a unittest library function that is used in unit testing to check whether an object is an instance of a given class or not. This function will take three parameters as input and return a boolean value depending upon the assert condition.
assertTrue() in Python is a unittest library function that is used in unit testing to compare test value with true. This function will take two parameters as input and return a boolean value depending upon the assert condition. If test value is true then assertTrue() will return true else return false.
Internally, unittest. main() is using a few tricks to figure out the name of the module (source file) that contains the call to main() . It then imports this modules, examines it, gets a list of all classes and functions which could be tests (according the configuration) and then creates a test case for each of them.
Empty lists/dicts evaluate to False, so self.assertTrue(d) gets the job done.
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