chore(core): Unicode version test

- refactor and support >= node version

Fixes: #10183

core/tests/unit/ldml/test_unicode.cpp

@@ -70,6 +70,18 @@ std::string get_major(const std::string& ver) {
   return ver.substr(start, end - start);
 }
 
+std::string get_block_unicode_ver() {
+  // fetch Blocks.txt
+  std::ifstream blocks_file(
+      km::core::path("../../../../resources/standards-data/unicode-character-database/Blocks.txt").native());
+  assert(blocks_file.good());
+  std::string block_line;
+  assert(std::getline(blocks_file, block_line));  // first line
+  const std::string prefix = "# Blocks-";
+  assert(block_line.length() > prefix.length());
+  return block_line.substr(prefix.length());
+}
+
 void test_unicode_versions(const nlohmann::json &versions, const nlohmann::json &package) {
   std::cout << "== " << __FUNCTION__ << std::endl;
 
@@ -79,14 +91,7 @@ void test_unicode_versions(const nlohmann::json &versions, const nlohmann::json
               node(versions["/node"_json_pointer].template get<std::string>()),
               node_icu(versions["/icu"_json_pointer].template get<std::string>()),
               node_engine(package["/engines/node"_json_pointer].template get<std::string>());
-  // fetch Blocks.txt
-  std::ifstream blocks_file(km::core::path("../../../../resources/standards-data/unicode-character-database/Blocks.txt").native());
-  assert(blocks_file.good());
-  std::string block_line;
-  assert(std::getline(blocks_file, block_line)); // first line
-  const std::string prefix = "# Blocks-";
-  assert(block_line.length()  > prefix.length());
-  const auto block_unicode_ver = block_line.substr(prefix.length());
+  const auto block_unicode_ver = get_block_unicode_ver();
 
   // calculations
   auto block_ver_major        = get_major(block_unicode_ver);
@@ -106,13 +111,17 @@ void test_unicode_versions(const nlohmann::json &versions, const nlohmann::json
   SHOW_VAR(block_unicode_ver);
 #undef SHOW_VAR
 
-  assert_basic_equal(node_major, node_engine_major);
+  // allow the Node.js version to be >= required
+  auto node_engine_num = std::atoi(node_engine_major.c_str());
+  auto node_num        = std::atoi(node_major.c_str());
+  assert(node_num >= node_engine_num);
+
   // the cxx_icu can come from the Ubuntu environment, so do not depend on it
   // for now.
   //assert_basic_equal(node_icu_unicode_major, cxx_icu_unicode_major);
   assert_basic_equal(node_icu_unicode_major, block_ver_major);
 
-  // seems less important if the Unicode verison matches the ICU version.
+  // seems less important if the C++ ICU verison matches the Node.js ICU version.
   //assert_basic_equal(cxx_icu_major, node_icu_major);
 
   std::cout << "All OK!" << std::endl;
@@ -123,11 +132,13 @@ void test_unicode_versions(const nlohmann::json &versions, const nlohmann::json
 int test_all(const char *jsonpath) {
   std::cout << "= " << __FUNCTION__ << std::endl;
 
+  // load the dump of node's process.versions which the meson.build file generated
   auto versions = load_json(km::core::path(jsonpath));
-  auto package = load_json(km::core::path("../../../../package.json"));
-
   assert(!versions.empty());
 
+  // load our top level package.json
+  auto package = load_json(km::core::path("../../../../package.json"));
+
   test_unicode_versions(versions, package);
 
   return EXIT_SUCCESS;