test: add export test suite for RangesUnion

src/core_test/cases/ranges_union.cc

@@ -1,11 +1,22 @@
 #include <gtest/gtest.h>
 
+#include <format>
+
+#include "hash.h"
 #include "helper/cases.h"
 #include "ranges/ranges.h"
 
 static_assert(std::is_base_of_v<std::array<Ranges, 16>, RangesUnion>);
 
-// TODO: test CommonCode export
+constexpr std::string_view ALL_CASES_MD5 = "3888e9fab8d3cbb50908b12b147cfb23";
+
+TEST(RangesUnion, export) {
+    std::string buffer;
+    for (auto code : AllCases::instance().fetch().codes()) {
+        buffer += std::format("{:09X}\n", code.unwrap());
+    }
+    EXPECT_EQ(hash::md5(buffer), ALL_CASES_MD5);
+}
 
 TEST(RangesUnion, operator) {
     Ranges r, r1, r2;