test: add test for signet miner script

Makefile.am

@@ -47,7 +47,8 @@ DIST_CONTRIB = \
 	       $(top_srcdir)/test/sanitizer_suppressions/tsan \
 	       $(top_srcdir)/test/sanitizer_suppressions/ubsan \
 	       $(top_srcdir)/contrib/linearize/linearize-data.py \
-	       $(top_srcdir)/contrib/linearize/linearize-hashes.py
+	       $(top_srcdir)/contrib/linearize/linearize-hashes.py \
+	       $(top_srcdir)/contrib/signet/miner
 
 DIST_SHARE = \
   $(top_srcdir)/share/genbuild.sh \

test/functional/test_runner.py

@@ -145,6 +145,8 @@ BASE_SCRIPTS = [
     'wallet_txn_doublespend.py --mineblock',
     'tool_wallet.py --legacy-wallet',
     'tool_wallet.py --descriptors',
+    'tool_signet_miner.py --legacy-wallet',
+    'tool_signet_miner.py --descriptors',
     'wallet_txn_clone.py',
     'wallet_txn_clone.py --segwit',
     'rpc_getchaintips.py',

test/functional/tool_signet_miner.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+# Copyright (c) 2022 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test signet miner tool"""
+
+import os.path
+import subprocess
+import sys
+import time
+
+from test_framework.key import ECKey
+from test_framework.script_util import key_to_p2wpkh_script
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
+from test_framework.wallet_util import bytes_to_wif
+
+
+CHALLENGE_PRIVATE_KEY = (42).to_bytes(32, 'big')
+
+
+class SignetMinerTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.chain = "signet"
+        self.setup_clean_chain = True
+        self.num_nodes = 1
+
+        # generate and specify signet challenge (simple p2wpkh script)
+        privkey = ECKey()
+        privkey.set(CHALLENGE_PRIVATE_KEY, True)
+        pubkey = privkey.get_pubkey().get_bytes()
+        challenge = key_to_p2wpkh_script(pubkey)
+        self.extra_args = [[f'-signetchallenge={challenge.hex()}']]
+
+    def skip_test_if_missing_module(self):
+        self.skip_if_no_cli()
+        self.skip_if_no_wallet()
+        self.skip_if_no_bitcoin_util()
+
+    def run_test(self):
+        node = self.nodes[0]
+        # import private key needed for signing block
+        node.importprivkey(bytes_to_wif(CHALLENGE_PRIVATE_KEY))
+
+        # generate block with signet miner tool
+        base_dir = self.config["environment"]["SRCDIR"]
+        signet_miner_path = os.path.join(base_dir, "contrib", "signet", "miner")
+        subprocess.run([
+                sys.executable,
+                signet_miner_path,
+                f'--cli={node.cli.binary} -datadir={node.cli.datadir}',
+                'generate',
+                f'--address={node.getnewaddress()}',
+                f'--grind-cmd={self.options.bitcoinutil} grind',
+                '--nbits=1d00ffff',
+                f'--set-block-time={int(time.time())}',
+            ], check=True, stderr=subprocess.STDOUT)
+        assert_equal(node.getblockcount(), 1)
+
+
+if __name__ == "__main__":
+    SignetMinerTest().main()