@Test
    public void shouldLendBook_setBorrowersName() {
        Book bookToTest = new Book("TestTitle", "2017", "Kimes", 1);
        String expectedBorrowersName = "Niedzielski";

        bookToTest.lendBook(expectedBorrowersName);

        assertEquals(expectedBorrowersName, bookToTest.getBorrowersName());

    }