如何从JUnit中具有InputStream的方法覆盖IOException

编程问答 2022-06-11

问题描述

想在我的JUnit测试中寻求帮助。在我的方法中，我能够覆盖所有需要抛出IOException的部分。我对此做了很多变通方法，但似乎都没有。

这是单元测试中未涵盖IOException的方法

public String GetstrXMLValue(String strXML,String strCriteria) {
    SAXBuilder builder = new SAXBuilder();
    builder.setProperty(XMLConstants.ACCESS_S1,"");
    builder.setProperty(XMLConstants.ACCESS_S2,"");

    Document xmlDocument;
    String strValue = "";
    ErrorHandler objErrHdl = new ErrorHandler();
    
    try {
        InputStream objStream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));

        xmlDocument = builder.build(objStream);
            
        XPathFactory xpath = XPathFactory.instance(); 
      
        XPathExpression<Object> expr = xpath.compile(strCriteria);
      
        List<Object> xPathSearchedNodes = expr.evaluate(xmlDocument);
        
        if (xPathSearchedNodes.size() > 0) {
        
            Content content = (Content) xPathSearchedNodes.get(0);
            
            strValue = content.getValue().toString();
        }
        
    } catch (JDOMException e) {
        objErrHdl.LogError(this.getClass().getName(),"GetstrXMLValue","ERROR RETRIEVING XML VALUES (XML=" + strXML + ";CRITERIA=" + strCriteria + ")",e.toString());
    } catch (IOException e) {
        objErrHdl.LogError(this.getClass().getName(),e.toString());
    } catch (Exception e) {
        objErrHdl.LogError(this.getClass().getName(),e.toString());
    }
            
    return strValue;
}

这是我的JUnit测试

@Test
public void testGetstrXMLValueThrowsIOException() throws IOException,ParserConfigurationException,SAXException,NoSuchMethodException,SecurityException,IllegalAccessException,IllegalArgumentException,InvocationTargetException,NoSuchFieldException {
    OutputStream responseBody = new ByteArrayOutputStream();
    String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n" + 
            "                <RESULT>\r\n" + 
            "                <SHORT_NAME>XXXXXXXXXXXXX</SHORT_NAME>\r\n" + 
            "                <ID_CODE>9999999999999</ID_CODE>\r\n" + 
            "                </RESULT>";
    
    xmlHandler.XMLGenerateRootResult();
    xmlHandler.GetstrXMLValue(xml,".//RESULT/ID_CODE/text()");
    try
    {
        InputStream input = XMLHandlerTest.readXML(xml);
        byte[] buffer = new byte[1024];
        int bytesRead;
        input.close();
        while ((bytesRead = input.read(buffer)) > 0)
        {
            responseBody.write(buffer,bytesRead);
            
            throw new IOException();
        }
    }
    catch(IOException e)
    {
        System.out.println(e);
    }

}

解决方法

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inputstreamioexceptionjavajavajunitmockito