* Create a strategy for block heights after Sapling
Provides an arbitrary network (mainnet or testnet) and a block height
between the Sapling activation height on that network and the maximum
block height.
* Create a helper function to select block heights
Allows generating block heights inside a range using a scale factor
between 0 and 1.
* Allow specifying the outpoint index for mock UTXOs
Avoid creating multiple transparent transfers in the same transaction
with the same source UTXO, which would lead to a double spend.
* Create helper function to mock multiple transfers
Given relative block height scale factors, create a mock transparent
transfer for each one of them.
Also add a constant that serves as a guideline for the maximum number of
transparent transfers to mock.
* Create helper function to sanitize tx. version
Make sure the arbitrary transaction version is valid for the network
(testnet or mainnet) at the specified block height.
* Create `mock_transparent_transaction` helper func.
Creates a V4 or V5 mock transaction that only includes transparent
inputs and outputs.
* Create helper function for transaction validation
Performs the actual tested action of verifying a transaction. It sets up
the verifier and uses it to obtain the verification result.
* Test if zero lock time means unlocked
Generate arbitrary transactions with zero lock time, and check that they
are accepted by the transaction verifier.
* Allow changing the sequence number of an input
Add a setter method for a `transparent::Input`'s sequence number. This
setter is only available for testing.
* Test if sequence numbers can disable lock time
Create arbitrary transactions and set the sequence numbers of all of its
inputs to `u32::MAX` to see if that disables the lock time and the
transactions are accepted by the verifier.
* Test block height lock times
Make sure that the transaction verifier rejects transactions that are
still locked at a certain block height.
* Test block time lock times
Test that the transaction verifier rejects a transaction that is
validated at a block time that's before the transaction's lock time.
* Test unlocking by block height
Test that transactions unlocked at an earlier block height are accepted
by the transaction verifier.
* Test transactions unlocked by the block time
Test that transactions that were unlocked at a previous block time are
accepted by the transaction verifier.
* Fix an incorrect method comment
Co-authored-by: teor <teor@riseup.net>
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