CMake: Add dynamic functional test discovery

Author: willcl-ark

test/CMakeLists.txt

@@ -47,3 +47,45 @@ foreach(script ${functional_tests} fuzz/test_runner.py)
   file(CREATE_LINK ${CMAKE_CURRENT_SOURCE_DIR}/${script} ${CMAKE_CURRENT_BINARY_DIR}/${script} COPY_ON_ERROR ${symlink})
 endforeach()
 unset(functional_tests)
+
+# Functional test discovery
+# Generate a CMake script that will be included by CTest to discover functional tests
+set(functional_include_file "${CMAKE_CURRENT_BINARY_DIR}/functional_tests_include.cmake")
+
+string(CONCAT functional_include_content
+  "# Generated functional test discovery for CTest\n"
+  "# This file is included by CTest to dynamically discover and register functional tests\n"
+  "\n"
+  "execute_process(\n"
+  "  COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/functional/list_tests.py\n"
+  "  OUTPUT_VARIABLE functional_test_output\n"
+  "  OUTPUT_STRIP_TRAILING_WHITESPACE\n"
+  "  ERROR_VARIABLE functional_test_error\n"
+  "  ERROR_STRIP_TRAILING_WHITESPACE\n"
+  "  RESULT_VARIABLE functional_test_result\n"
+  "  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}\n"
+  ")\n"
+  "\n"
+  "if(NOT functional_test_result EQUAL 0)\n"
+  "  add_test(bitcoin.functional.DISCOVERY_FAILURE ${Python3_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/functional/list_tests.py)\n"
+  "else()\n"
+  "  string(REPLACE \"\\n\" \";\" functional_test_lines \"\${functional_test_output}\")\n"
+  "  foreach(test_script IN LISTS functional_test_lines)\n"
+  "    if(test_script MATCHES \"^(.+\\\\.py)$\")\n"
+  "      string(REGEX REPLACE \"\\\\.py$\" \"\" test_name \"\${test_script}\")\n"
+  "      add_test(\"bitcoin.functional.\${test_name}\" ${Python3_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/functional/\${test_script})\n"
+  "      set_tests_properties(\"bitcoin.functional.\${test_name}\" PROPERTIES\n"
+  "        LABELS \"functional\"\n"
+  "        WORKING_DIRECTORY \"${CMAKE_CURRENT_BINARY_DIR}\"\n"
+  "      )\n"
+  "    endif()\n"
+  "  endforeach()\n"
+  "endif()\n"
+)
+
+file(GENERATE
+  OUTPUT "${functional_include_file}"
+  CONTENT "${functional_include_content}"
+)
+
+set_property(DIRECTORY APPEND PROPERTY TEST_INCLUDE_FILES "${functional_include_file}")

test/functional/list_tests.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# Copyright (c) 2025-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+"""
+List functional tests for CMake test discovery.
+"""
+
+import sys
+import os
+
+# Add the current directory to sys.path so we can import test_runner
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+try:
+    import test_runner
+    # Output all tests (BASE_SCRIPTS + EXTENDED_SCRIPTS)
+    # all_tests = test_runner.BASE_SCRIPTS + test_runner.EXTENDED_SCRIPTS
+    all_tests = test_runner.BASE_SCRIPTS
+    for test in all_tests:
+        print(test)
+except ImportError as e:
+    print(f"Error importing test_runner: {e}", file=sys.stderr)
+    sys.exit(1)
+except Exception as e:
+    print(f"Error listing tests: {e}", file=sys.stderr)
+    sys.exit(1)