@Test
    void shouldThrowExceptionIllegalArgument() throws Exception {
        String rentDate = "2020-06-15";
        String returnDate = "2020-06-18";
        String idRentLocation = "1";
        String idReturnLocation = "1";
        try {
            this.mockMvc.perform(post("/podsumowanieWypozyczenia/{id}", 19L)
                    .with(user("user").roles("USER"))
                    .param("rentDate", rentDate)
                    .param("returnDate", returnDate)
                    .param("locationsW", idRentLocation)
                    .param("locationsZ", idReturnLocation));
        } catch (NestedServletException ex) {
            assertTrue(ex.getCause() instanceof IllegalArgumentException);
            assertEquals(ex.getCause().getMessage(),"Empty offer");
        }
    }

    @Test
    void shouldAddNewRent() throws Exception {
        String rentDate = "2020-06-15";
        String returnDate = "2020-06-18";
        String idRentLocation = "1";
        String idReturnLocation = "1";

            this.mockMvc.perform(post("/podsumowanieWypozyczenia/{id}", 1L)
                    .with(user("user").roles("USER"))
                    .param("rentDate", rentDate)
                    .param("returnDate", returnDate)
                    .param("locationsW", idRentLocation)
                    .param("locationsZ", idReturnLocation))
            .andExpect(status().isOk())
            .andExpect(view().name("podsumowanieWypozyczenia"))
            .andExpect(model().attributeExists("kwota","rentDate","returnDate","rentLocation","returnLocation","nameCar"));
    }