How to mock the following stub in mockito

I am not sure how to mock the when and then for "nameValuePairs" which is a

List nameValuePairs

Authorization filteredAuthorization= baseClient.getAuthorizationsForFilteredDepartmets(up.getAuthorization().getAuthorizationToken(), nameValuePairs);

The following method I am trying to Unit Test

 public static void applyFilteredDeptCagsToUserProfile(UserProfile up,List<NameValuePair> nameValuePairs) throws Exception {

        log.info("Applying FilteredDeptCagsToUserProfile ");
        BaseRestClient baseClient = getBaseRestClient();
        Authorization filteredAuthorization= baseClient.getAuthorizationsForFilteredDepartmets(up.getAuthorization().getAuthorizationToken(), nameValuePairs);

        if(null!=filteredAuthorization) {
          up.setAuthorization(filteredAuthorization);
        }

        Map<String, String> origDeptMap= up.getDeptsIdNameMap(); //
        Map<String, String> origCAGMap= up.getCagsIdNameMap();
        Map<String, String> revisedDeptMap= new HashMap<String, String>();
        Map<String, String> revisedCAGMap= new HashMap<String, String>();

        for (NameValuePair nameValuePair : nameValuePairs) {

           if("department".equalsIgnoreCase(nameValuePair.getName())) {
               createRestrictedList(origDeptMap, revisedDeptMap, nameValuePair);
           }
           else if ("group".equalsIgnoreCase(nameValuePair.getName())) {
               createRestrictedList(origCAGMap, revisedCAGMap, nameValuePair);
          }

        }

        if(revisedDeptMap.size()>0) {
            up.setDeptsIdNameMap(revisedDeptMap);
        }

        if(revisedCAGMap.size()> 0) {
            up.setCagsIdNameMap(revisedCAGMap);
        } 
    }



    private static void createRestrictedList(Map<String, String> origDeptList, Map<String, String> revisedDeptList,
                NameValuePair nameValuePair) {
        String key =nameValuePair.getValue();
            if (null !=key) {
                String value = origDeptList.get(key);
                if (null != value) {
                    revisedDeptList.put(key, value);
                }
            }
    }

I have created the class and the snap shot of the test method

@Test
    public void testFilteredDeptCagRestrictions() {
      when(upMock.getAuthorization().getAuthorizationToken()).thenReturn(new AuthorizationToken());
      when(baseRestClientMock.getAuthorizationsForFilteredDepartmets(any(AuthorizationToken.class),any(List.class)).thenReturn(""));

}

The problem is how to pass the

> List<NameValuePair> nameValuePairs

in the getAuthorizationsForFilteredDepartmets method.