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Without this, salt would (errouneoulsy) produce an empty packages argument for "pip install" call, thus resulting in a error saying "You must give at least one requirement to install". Perhaps this is fixed in more recent versions of Salt? I didn't checked. In the meantime, we force upgrade so that idempotence works. Accordingly, we add pip.installed state to the list of "exclude" in test_idempotence so that their "Changes" result won't be inspected.
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