从NonStrictExceptions转换为期望

Question

我在jMockit v 1.22中使用NonStrictExpectations测试用例如下：

@Mocked Scanner mockScanner;

@Test
public void getNumber496() {
    new NonStrictExpectations() {{
        mockScanner.nextLine(); result = "496";
    }};
    int val = PrimeOrPerfect.getNumber();  // calls Scanner.nextLine() for a number
    assertEquals(496, val);
}

模拟效果很好。

升级到jMockit v.1.25后，我改为Expectations（因为NonStrictExceptions已被弃用），如下所示：

@Mocked Scanner mockScanner;

@Test
public void getNumber496() {
    new Expectations() {{
        mockScanner.nextLine(); result = "496";
    }};
    int val = PrimeOrPerfect.getNumber();  // calls Scanner.nextLine() for a number
    assertEquals(496, val);
}

模拟方法始终返回 null 。新代码出了什么问题？

以下是getNumber（）的代码：

protected static int getNumber() {
    logger.info(">>getNumber()");
    Scanner scanner = new Scanner(System.in);
    boolean validInput = false;
    int number;
    System.out.println("Enter a whole positive number (0 to quit):");
    do {
        String line = scanner.nextLine();
        logger.info("input number: {}", line);
        number = 0;
        try {
            number = Integer.parseInt(line);
        } catch (NumberFormatException e) {
            logger.debug("input is invalid: {}", e.toString());
            System.err.println("Please enter a positive integer less than 1001.");
            continue;
        }
        if (number < 0 || number > 1000 ) {
            logger.debug("input is out of range 1..1000.");
            System.err.println("Please enter a valid number between 1 and 1,000 inclusive.");
        } else {
            validInput = true;
        }
    } while (!validInput);
    // Don't close the scanner because doing so also closes System.in.  Do NOT uncomment the line below.
    //scanner.close();
    logger.info("<<getNumber()");
    return number;
}