untested warning for is_subscription about django-paypal HOT 4 OPEN

Hi, @newearthmartin I am new to this repo and interested. Is this something I can look into and try solving or was it fixed? and Is there any contributing guide?

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@spookylukey care to answer to this new contributor @VinneyJ ?

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A good test would be like this:

• Find some examples of IPN/PDT objects that are for subscriptions, from your real data, and locate the important properties
• Write a test or several tests that creates similar IPN objects, probably in test_ipn.py, using PayPalIPN.objects.create(...)
• The test should assert that the the relevant properties return True/False for IPN objects that are/are not subscriptions.

It would be nice to add tests for the other methods like is_subscription_payment etc., based on real data, and also make any corrections to these methods as necessary.

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Thanks a lot, @spookylukey let me dive in and check it out.

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