e469dcd32c174e6a3d898f9e61196231f4671159 Add test with funded wallet (Steve Myers)
Pull request description:
This PR adds an example test using the `bdk` test funded wallet. The example test makes sure the `bdk-ffi` `TxBuilder` is able to drain a single wallet UTXO to a single address. More tests can be added as we need them in future PRs.
Required to complete #141
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