tonihei d9aee0f6a4 Add DataSource contract test for transfer listeners when opening fails.
TransferListener has the contract to have exactly one onTransferEnd per
onTransferStart, so the test can both assert that onTransferInitializing
is called, but not onTransferEnd (even after calling close).

PiperOrigin-RevId: 362262078
2021-03-12 10:42:55 +00:00
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