add test cases

hardhat.config.ts

@@ -0,0 +1,14 @@
+import { HardhatUserConfig } from "hardhat/config";
+import "@nomicfoundation/hardhat-toolbox";
+
+const config: HardhatUserConfig = {
+  solidity: "0.8.19",
+  paths: {
+    sources: "./contracts",
+    tests: "./test",
+    cache: "./cache",
+    artifacts: "./artifacts"
+  },
+};
+
+export default config;