TST: Parametrize JoinNode expansion tests over config `needed_outputs`#2981

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oesteban merged 3 commits intonipy:masterfrom

oesteban:tst/parametrize-join-expansion

Aug 1, 2019

Commits on Aug 1, 2019

TST: Parametrize over config ``needed_outputs`` JoinNode expansion tests
oesteban
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Apply suggestions from code review [skip ci]

oesteban
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effigies
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fix: reset initial state after test (addresses @effigies' review comment)
oesteban
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