@Override
    public String toString() {
      return "Value ["
          + " name : " + name
          + " lastName : " + lastName
          + " department : " + department
          + " age : " + age
          + " employeeId : " + employeeId
          + " ]";
    }
Sample class for Data DUnit tests with JSON keys and values
geode-dunit/src/main/java/org/apache/geode/management/internal/cli/commands/QueryCommandDistributedTestBase.java