Merge bitcoin/bitcoin#23532: test: add functional test for -startupnotify

126853214a490ee840e83ca17c717c40cfbe6837 test: add functional test for -startupnotify (Bruno Garcia)

Pull request description:

  This PR adds a functional test for -startupnotify. It basically starts the node passing a command on -startupnotify to create a file on tmp and then, we check if the file has been successfully created.

ACKs for top commit:
  theStack:
    Tested ACK 126853214a490ee840e83ca17c717c40cfbe6837
  kristapsk:
    re-ACK 126853214a490ee840e83ca17c717c40cfbe6837

Tree-SHA512: 5bf3e46124ee5c9d609c9993e6465d5a71a8d2275dcf07c8ce0549f013f7f8863d483b46b7164152f566468a689371ccb87f01cf118c3c9cac5b2be673b61a5c

test/functional/feature_startupnotify.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# Copyright (c) 2020 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 -startupnotify."""
+
+import os
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+)
+
+NODE_DIR = "node0"
+FILE_NAME = "test.txt"
+
+
+class StartupNotifyTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.disable_syscall_sandbox = True
+
+    def run_test(self):
+        tmpdir_file = os.path.join(self.options.tmpdir, NODE_DIR, FILE_NAME)
+        assert not os.path.exists(tmpdir_file)
+
+        self.log.info("Test -startupnotify command is run when node starts")
+        self.restart_node(0, extra_args=[f"-startupnotify=echo '{FILE_NAME}' >> {NODE_DIR}/{FILE_NAME}"])
+        assert os.path.exists(tmpdir_file)
+
+        self.log.info("Test -startupnotify is executed once")
+        with open(tmpdir_file, "r", encoding="utf8") as f:
+            file_content = f.read()
+            assert_equal(file_content.count(FILE_NAME), 1)
+
+        self.log.info("Test node is fully started")
+        assert_equal(self.nodes[0].getblockcount(), 200)
+
+
+if __name__ == '__main__':
+    StartupNotifyTest().main()

test/functional/test_runner.py

@@ -265,6 +265,7 @@ BASE_SCRIPTS = [
     'rpc_bind.py --nonloopback',
     'mining_basic.py',
     'rpc_named_arguments.py',
+    'feature_startupnotify.py',
     'wallet_listsinceblock.py --legacy-wallet',
     'wallet_listsinceblock.py --descriptors',
     'wallet_listdescriptors.py --descriptors',