import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.List;

import org.junit.jupiter.api.BeforeEach;

import org.junit.jupiter.api.Test;

import org.mockito.Mockito;

public class InputFromConsoleTest $\{$

List list;

ScannerWrapper scannerWrapper;

SystemWrapper systemWrapper;

InputFromConsole input;

@BeforeEach

public void setUp$()\{$

scannerWrapper $=$ Mockito.mock$($ScannerWrapper$.$class$)$;

systemWrapper $=$ Mockito.mock$($SystemWrapper$.$class$)$;

input $=$ new InputFromConsole$($scannerWrapper$,$ systemWrapper$)$;

$\}$

@Test

public void input$\_$from$\_$scanner$()\{$

Mockito.when$($scannerWrapper$.$nextLine$()).$thenReturn$("$Descent of Man", "The Ascent of Man",

"The Old Man and The Sea", "A Portrait of The Artist As a Young Man", $"-1")$;

list $=$ input.read$()$;

Mockito.verify$($systemWrapper$).$println$("$Please enter lines to add, then enter $-1$ to finish:"$)$;

assertEquals$("$Descent of Man", list.get$(0))$;

assertEquals$("$The Ascent of Man", list.get$(1))$;

assertEquals$("$The Old Man and The Sea", list.get$(2))$;

assertEquals$("$A Portrait of The Artist As a Young Man", list.get$(3))$;

$\}$

$\}$

Please enter lines to add, then enter $-1$ to finish:

java.lang.NullPointerException

at InputFromConsole.read$($InputFromConsole$.$java:$29)$