Cannot solved both using thenReturn or doReturn, any recommendation?

Ojam 0
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This code on ServiceImpl

List<EmployeeResponse> employeeResponses = employeeApiClient.getEmployeeByEmpNo(apiSecret, List.of(operationUserId));

Long branchId = Long.parseLong(employeeResponses.get(0).getWorklocationCode());

and, I wanna create the unit test, I already create this,

List<EmployeeResponse> employeeResponses = List.of(mockEmployeeResponse());
Long branchId = Long.parseLong(employeeResponses.get(0).getWorklocationCode());

and, when I use this,

doReturn(List.of(branchId)).when(employeeApiClient).getEmployeeByEmpNo(any(), anyList());

the response is

java.lang.NullPointerException

when I use this,

doReturn(branchId).when(employeeApiClient).getEmployeeByEmpNo(any(), anyList());

the response is

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
Long cannot be returned by getEmployeeByEmpNo()
getEmployeeByEmpNo() should return List

and, when I use this,

when(employeeApiClient.getEmployeeByEmpNo(any(), anyList())).thenReturn(branchId);

the response is

Cannot resolve method 'thenReturn(Long)'

Maybe, any others way to solve this issue, thank you for help.

I'm new on use the unit test (Mock), so I tried to ask about my problem for learning and getting answer.

mockito spring spring-boot java unit-testing
2 Answers

You are doing right and since employeeApiClient.getEmployeeByEmpNo is returning List<EmployeeResponse> you should return the same type

when(employeeApiClient.getEmployeeByEmpNo(any(), anyList())).thenReturn(List.of(mockEmployeeResponse()));
Deadpool0

if your method in when() parameter is return a List of EmployeeResponse, you should put a List of EmployeeResponse too as argument in .thenReturn() parameter.

example:

List<EmployeeResponse> employeeResponses = List.of(mockEmployeeResponse());
when(employeeApiClient.getEmployeeByEmpNo(any(), anyList())).thenReturn(employeeResponses);

but if you want it return Long type, you can change when argument to:

Long exampleBranchId = 2L;
when(employeeApiClient.getEmployeeByEmpNo(any(), anyList()).get(anyInt()).getWorklocationCode()).thenReturn(exampleBranchId);
Revantama0
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