@Test
public void onScroll_withCompleteZigZag_shouldSetStateToGoingLeftAndNumberOfZigZagsIs1() throws Exception {

    performZig();
    assertZigZagState(GOING_RIGHT);
    assertThat(subject.getNumberOfZigzags()).isEqualTo(0);
    performZag();
    assertZigZagState(GOING_LEFT);
    assertThat(subject.getNumberOfZigzags()).isEqualTo(1);
}