should be it

external/duckdb/test/api/capi/test_starting_database.cpp

@@ -0,0 +1,35 @@
+#include "catch.hpp"
+#include "duckdb.h"
+
+using namespace std;
+
+TEST_CASE("Simple In-Memory DB Start Up and Shutdown", "[simplestartup]") {
+	duckdb_database database;
+	duckdb_connection connection;
+
+	// open and close a database in in-memory mode
+	REQUIRE(duckdb_open(NULL, &database) == DuckDBSuccess);
+	REQUIRE(duckdb_connect(database, &connection) == DuckDBSuccess);
+	duckdb_disconnect(&connection);
+	duckdb_close(&database);
+}
+
+TEST_CASE("Multiple In-Memory DB Start Up and Shutdown", "[multiplestartup]") {
+	duckdb_database database[10];
+	duckdb_connection connection[100];
+
+	// open and close 10 databases
+	// and open 10 connections per database
+	for (size_t i = 0; i < 10; i++) {
+		REQUIRE(duckdb_open(NULL, &database[i]) == DuckDBSuccess);
+		for (size_t j = 0; j < 10; j++) {
+			REQUIRE(duckdb_connect(database[i], &connection[i * 10 + j]) == DuckDBSuccess);
+		}
+	}
+	for (size_t i = 0; i < 10; i++) {
+		for (size_t j = 0; j < 10; j++) {
+			duckdb_disconnect(&connection[i * 10 + j]);
+		}
+		duckdb_close(&database[i]);
+	}
+}