java - Junit 异常

Question

我有一段带有 try-catch 块的代码：

 public static void writeExcelToFile(String outFileName, HSSFWorkbook workBook) throws IOException{
    File file = null;
    FileOutputStream fileOutputStream = null;
    try {
        file = getFileByFileName(outFileName);
        File parent = file.getParentFile();
        Path filePath = parent.toPath();
        if (Files.notExists(filePath) && !parent.mkdirs()) {
            throw new IOException("Couldn't create dir: " + parent);
        }
        fileOutputStream = new FileOutputStream(file);
        workBook.write(fileOutputStream);
    } catch (FileNotFoundException fileNotFoundException) {
        LOGGER.error("File path is invalid, file not found ", fileNotFoundException);
        throw fileNotFoundException;
    } catch (IOException ioException) {
        LOGGER.error("Exception occured while reading writing file ", ioException);
        throw ioException;
    } catch (Exception exception) {
        LOGGER.error("Exception occured ", exception);
        throw exception;
    } finally {
        if (fileOutputStream != null) {
            fileOutputStream.close();
        }
    }
    file.setWritable(true);
}

我为 catch 块编写了以下 Junit：

//#1: FileNotFoundException
@Test(expected = java.io.FileNotFoundException.class)
public void testWriteExcelToFileException() throws IOException {
    PowerMockito.mockStatic(KnewtonCIExcelWriter.class);
    PowerMockito.doThrow(new java.io.FileNotFoundException()).when(KnewtonCIExcelWriter.class);
    KnewtonCIExcelWriter.writeExcelToFile(anyString(), anyObject());
}

//#2: IOException
@Test(expected = IOException.class)
public void testWriteExcelIOException() throws IOException {
    PowerMockito.mockStatic(KnewtonCIExcelWriter.class);
    PowerMockito.doThrow(new IOException()).when(KnewtonCIExcelWriter.class);
    KnewtonCIExcelWriter.writeExcelToFile(anyString(), anyObject());
}

//#3: Exception
@Test(expected = Exception.class)
public void testWriteExcelException() throws IOException {
    PowerMockito.mockStatic(KnewtonCIExcelWriter.class);
    PowerMockito.doThrow(new Exception()).when(KnewtonCIExcelWriter.class);
    KnewtonCIExcelWriter.writeExcelToFile(anyString(), anyObject());
}

然而，只有最后一个，#3 Junit 通过。#1 和 #2 给出 java.lang.AssertionError: Expected exception: java.io.FileNotFoundException 和 java.lang.AssertionError: Expected exception: java.io.IOEXception。

问题：1）如何让#1 和#2 JUnit 通过？2）我是否捕捉到了正确的异常？

Answer 1

doThrow 上的 powermockito 语法何时应该是

when(KnewtonCIExcelWriter.class, "your method", argument (you can user matcher));