Tests perform overly exact matching on some fields

[lutzky]

For example, if I have a test where one of the messages has to: ['some-list'], and I have a rule filtering for to: ['some-list'], the test thinks that this rule is applied to that message. However, if the message has to: ['[email protected]'], the test things that this rule is not applied to that message; in real-gmail-filtering it is.