当CSVWriter ()时，csvWriter.close什么时候抛出异常？

Question

我试图介绍一个异常的单元测试用例。我的代码如下所示

if (null != csvWriter) {
        try {
          csvWriter.close();
        } catch (Exception ee) {
          log.error("Error in closing csvWriter. You may loose content.");
        }
      }

我想在Mockito单位的情况下讨论例外情况。有办法吗？

Answer 1

假设你的CSVWriter是假的。然后，您可以让它在调用close方法时抛出一个异常。

@Test
void csvWriterThrows() throws IOException
{
    final CSVWriter csvWriter = Mockito.mock(CSVWriter.class);
    Mockito.doThrow(IOException.class).when(csvWriter).close();

    final IOException ioException = Assertions.assertThrows(IOException.class, csvWriter::close);

    Assertions.assertEquals(IOException.class, ioException.getClass());
    # more assertions...
}