Let’s assume the class where the now() method is defined is called Run. When testing methods that call this method, you can mock the call to return whatever date in the future (or that past) that you need to. In your code where you need to set now, simply call this method instead of calling datetime.now() directly. """Provide a method for now so that now can be mocked in datetime now That is simply write it as its own method, so that the method may later be mocked. There may be mock functions specific to python out there that will mock dates, but this example will provide an easy and convenient way to mock datetime now. While we shouldn’t say never, at least almost never use it in the body of a method. Never use datetime.now() in the body of a method. Setting the date forward 100 years may just be pushing the problem out further, but what software product actually lives to be 100 years old anyway? Where to use datetime.now() So, it is necessary to change the dates of the tests to be much further in the future. Expiration dates are an important data point to test with certificates, but using certificate with validity periods in the near future will eventually break tests. The use case for mocking datetime now in this article is that of SSL Certificate Objects in Python. Unit testing is vital to any successful and robust software product, and having the ability to mock sections of your code is a critical part of that. This article will demonstrate how to with Python mock datetime now in unit testing.
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