fix tests

Author: twwu123

jest.config.ts

@@ -4,10 +4,11 @@ const jestConfig: Config = {
   clearMocks: true,
   maxWorkers: 1,
   testEnvironment: "node",
-  testMatch: ["**/packages/**/*.test.ts"],
+  testMatch: ["**/test/**/*.test.ts"],
   setupFiles: ["dotenv/config"],
   preset: "ts-jest",
   moduleNameMapper: {
+    "^@meshsdk/provider$": "<rootDir>/src/index.ts",
     "^(\\.{1,2}/.*)\\.js$": "$1",
   },
   transform: {