Add integration test-helpers and refactor integration tests

jest.config.integ.cjs

@@ -5,8 +5,9 @@ module.exports = {
   globalTeardown: './test/integration/teardown.cjs',
   setupFiles: ['./test/integration/helpers.cjs'],
   testPathIgnorePatterns: ['/node_modules/', 'test/unit'],
-  testTimeout: 5000,
+  verbose: true,
+  randomize: true,
   globals: {
     testServerUrl: 'http://localhost:3005/'
-  }
+  },
 };