TestTraits.java

public interface TestTraits {
    String EMPLOYEE_ID = "1";
    Long EMPLOYEE_ID_LONG = 1L;

    default EmployeeRpy getEmployee(){
        EmployeeRpy objEmpRpy = new EmployeeRpy();
        objEmpRpy.setEmpName("Mugil");
        objEmpRpy.setEmpAge("34");
        return objEmpRpy;

     default EmployeeDetailsResource createMockedEmployeeDetails() 
          throws IOException(){
       EmployeeDetailsResource objEmployeeDetailsResource = 
              new Gson.fromJson(getReader("json-data/EmployeeDetails.json"), EmployeeDetails.class);    
       return objEmployeeDetailsResource; 
     } 

     default Reader getReader(String filePath) throws IOException{
       return new FileReader(new ClassPathResource(filePath).getFile());  
     }
}

EmployeeDetails.json

  {
     "empID" : "101",
     "empName" : "Mugilvannan",
     "empAge" : "30"
  } 

EmployeeMgmtTest.java

 @ExtendWith({MockitoExtension.class})
 class EmployeeMgmtTest implements TestTraits{
    .
    . 
    Code for Testing Goes Here
    .
    .
 }