@Test
public void testEarningsSumOverMonth() {

    UkelonnServiceProvider ukelonn = getUkelonnServiceSingleton();
    List<SumYearMonth> statistics = ukelonn.earningsSumOverMonth("jad");
    assertThat(statistics.size()).isPositive();
    SumYearMonth firstYear = statistics.get(0);
    assertEquals(125.0, firstYear.getSum(), 0.0);
    assertEquals(2016, firstYear.getYear());
    assertEquals(7, firstYear.getMonth());
}