Java 具有模拟用户输入的JUnit测试

你可以通过调用

System.setIn（InputStream in）

System.in。InputStream

InputStream sysInBackup = System.in; // backup System.in to restore it laterByteArrayInputStream in = new ByteArrayInputStream("My string".getBytes());System.setIn(in);// do your thing// optionally, reset System.in to its originalSystem.setIn(sysInBackup);

通过将IN和OUT作为参数传递，不同的方法可以使此方法更具可测试性：

public static int testUserInput(InputStream in,PrintStream out) {    Scanner keyboard = new Scanner(in);    out.println("Give a number between 1 and 10");    int input = keyboard.nextInt();    while (input < 1 || input > 10) {        out.println("Wrong number, try again.");        input = keyboard.nextInt();    }    return input;}