Replace assertEqual(None, *) with assertIsNone in tests
Replace assertEqual(None, *) with assertIsNone in tests

Replace assertEqual(None, *) with assertIsNone in tests to have
more clear messages in case of failure.

Change-Id: I0dfc37bd9aad42914e1cd4b2bfadb71358d62bf4
Closes-bug: #1280522

stackforge/dox