Java Mockito - Unable to throw IOException during DocumentBuilder.parse

问题

I am trying to create a JUnit test to fire IOException during DocumentBuilder.parse(InputSource.class).

I not sure why my "doThrow" method is not firing IOException.

The source code is as below: JUnit class:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:META-INF/spring/test.xml" })
@Transactional
public class junitTestClass {

    @InjectMocks
    TargetClass target;

    @Rule
    public MockitoRule mockito = MockitoJUnit.rule();

    @Mock
    DocumentBuilder documentBuilder;

    @Mock
    DocumentBuilderFactory documentBuilderFactory;

    @Mock
    XPath xpath;

    @Test
    public void test01() throws InterruptedException, SAXException, IOException, ParserConfigurationException{

        when(documentBuilderFactory.newDocumentBuilder()).thenReturn(documentBuilder);
        doThrow(new IOException()).when(documentBuilder).parse(any(InputSource.class));

        String xml = "<?xml version="1.0" encoding="UTF-8"?><aaa><bbb>123</bbb></aaa>";
        String pattern = "//aaa/bbb";

        try {
            target.parseXML(xml, pattern);
        }catch(Exception e) {
            e.printStackTrace();
        }
    }
}

Main Class:

private String parseXML(String xml, String pattern) {
        String itemValue ;

        try {
            DocumentBuilderFactory dFac = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dFac.newDocumentBuilder();
            Document document = db.parse(new InputSource(new StringReader(xml)));
            XPath xPath = XPathFactory.newInstance().newXPath();
            Node msgId = (Node) xPath.compile(pattern).evaluate(document, XPathConstants.NODE);
            itemValue = msgId.getTextContent();
        } catch (XPathExpressionException | SAXException | ParserConfigurationException | IOException e) {
            e.printStackTrace();
        }
        return itemValue;
    }

回答1:

You should use:

doThrow(IOException.class)

Instead of instantiating it.

来源：https://stackoverflow.com/questions/56987610/java-mockito-unable-to-throw-ioexception-during-documentbuilder-parse

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java

junit

mockito