chore: simplify jest config

Author: exuanbo

jest.config.js

@@ -1,11 +1,7 @@
 module.exports = {
   clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
+  preset: 'ts-jest',
   testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
-  transform: {
-    '^.+\\.ts$': 'ts-jest'
-  },
+  testMatch: ['<rootDir>/__tests__/**/*.test.ts'],
   verbose: true
 }