should be it

external/duckdb/test/api/test_windows_unicode_path.cpp

@@ -0,0 +1,53 @@
+#include "catch.hpp"
+#include "test_helpers.hpp"
+#include "duckdb.hpp"
+#include "duckdb/main/db_instance_cache.hpp"
+
+using namespace duckdb;
+using namespace std;
+
+void TestConnectToDatabase(const string &path, bool create_table = false) {
+	// connect to the database using the standard syntax
+	{
+		DuckDB db(path);
+		Connection con(db);
+		if (create_table) {
+			REQUIRE_NO_FAIL(con.Query("CREATE TABLE test AS SELECT * FROM range(10) t(i)"));
+		}
+
+		auto result = con.Query("SELECT SUM(i) FROM test");
+		REQUIRE(CHECK_COLUMN(result, 0, {45}));
+	}
+
+	// connect to the database using the db instance cache
+	{
+		DBInstanceCache cache;
+		DBConfig config;
+		auto db = cache.CreateInstance(path, config);
+		Connection con(*db);
+
+		auto result = con.Query("SELECT SUM(i) FROM test");
+		REQUIRE(CHECK_COLUMN(result, 0, {45}));
+	}
+}
+
+TEST_CASE("Issue #6931 - test windows unicode path", "[windows]") {
+	string dirname = "Moseguí_i_González";
+	auto test_directory = TestDirectoryPath() + "/" + dirname;
+	auto current_directory = TestGetCurrentDirectory();
+	TestCreateDirectory(test_directory);
+	TestChangeDirectory(test_directory);
+
+	// relative path INSIDE folder with accents
+	TestConnectToDatabase("test.db", true);
+
+	TestChangeDirectory("..");
+	// relative path TOWARDS folder with accents
+	TestConnectToDatabase(dirname + "/" + "test.db");
+
+	// absolute path with folder with accents
+	TestConnectToDatabase(current_directory + "/" + test_directory + "/" + "test.db");
+
+	// revert current working directory
+	TestChangeDirectory(current_directory);
+}