@Test
public void testCallNumberIsEmpty() {
try {
Book callNumberIsEmpty = new Book("Bob Jones", "Subject", "", 4);
callNumberIsEmpty.getCallNumber();
fail("Illegal Argument Exception");
} catch (IllegalArgumentException e) {
assertTrue(true);
}
}
@Test
public void testGetCallNumber() {
assertEquals("callNumber", BookTesting.getCallNumber());
}