@Test
public void testWarnsUserIfNoBooksAreAvailable() {
when(library.numberOfBooksInLibrary()).thenReturn(0);
checkoutBookMenuOperation.execute(library, console);
verify(console).printMessage("There are no books available for checkout");
}
private Library buildMockLibraryWithSetBookAmounts(
int numberOfBooksAvailable, int numberOfBooksCheckedOut) {
library = mock(Library.class);
when(library.numberOfBooksInLibrary()).thenReturn(numberOfBooksAvailable);
when(library.numberOfBooksCheckedOut()).thenReturn(numberOfBooksCheckedOut);
for (int i = 0; i < numberOfBooksAvailable; i++) {
when(library.bookIsAvailable(i)).thenReturn(true);
}
for (int i = 0; i < numberOfBooksCheckedOut; i++) {
when(library.bookIsCheckedOut(i)).thenReturn(true);
}
return library;
}