bench: benchmark transaction creation process

Goal 1:
Benchmark the transaction creation process for pre-selected-inputs only.
Setting `m_allow_other_inputs=false` to disallow the wallet to include coins automatically.

Goal 2:
Benchmark the transaction creation process for pre-selected-inputs and coin selection.

-----------------------

Benchmark Setup:
1) Generates a 5k blockchain, loading the wallet with 5k transactions with two outputs each.
2) Fetch 4 random UTXO from the wallet's available coins and pre-select them as inputs inside CoinControl.

Benchmark (Goal 1):
Call `CreateTransaction` providing the coin control, who has set `m_allow_other_inputs=false` and
the manually selected coins.

Benchmark (Goal 2):
Call `CreateTransaction` providing the coin control, who has set `m_allow_other_inputs=true` and
the manually selected coins.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/test/util/wallet.cpp b/src/test/util/wallet.cpp
index b54774cbb9..2dadffafb4 100644
--- a/src/test/util/wallet.cpp
+++ b/src/test/util/wallet.cpp
@@ -21,7 +21,12 @@ const std::string ADDRESS_BCRT1_UNSPENDABLE = "bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqq
 std::string getnewaddress(CWallet& w)
 {
     constexpr auto output_type = OutputType::BECH32;
-    return EncodeDestination(*Assert(w.GetNewDestination(output_type, "")));
+    return EncodeDestination(getNewDestination(w, output_type));
+}
+
+CTxDestination getNewDestination(CWallet& w, OutputType output_type)
+{
+    return *Assert(w.GetNewDestination(output_type, ""));
 }
 
 #endif // ENABLE_WALLET