add sqlocal connection including example

packages/sqlocal/test/connection.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it } from "vitest";
+import { SQLocalConnection, type SQLocalConnectionConfig } from "../src";
+
+describe(SQLocalConnection, () => {
+   function create(config: SQLocalConnectionConfig = {}) {
+      return new SQLocalConnection(config);
+   }
+
+   it("constructs", async () => {
+      const connection = create();
+      expect(() => connection.client).toThrow();
+      await connection.init();
+      expect(connection.client).toBeDefined();
+      expect(await connection.client.sql`SELECT 1`).toEqual([{ "1": 1 }]);
+   });
+});