我有要测试的servlet。我想测试Mockito的doGet。
在srvlet的主要代码信息中,转到PrintWriter的页面/ json。
在我的测试中,我想将文件保存在要获取测试信息的位置。并且我无法测试PrintWriter(我不知道如何)
我尝试使用而不是测试中的PrintWriter
StringWriter sw = new StringWriter();
PrintWriter pw =new PrintWriter(sw);
when(new PrintWriter(resp.getOutputStream())).thenReturn(pw);
这是我的Servlet doGEt
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/json");
PrintWriter writer = new PrintWriter(resp.getOutputStream());
ObjectMapper mapper = new ObjectMapper();
String jsonString = mapper.writeValueAsString(list);
writer.append(jsonString);
writer.flush();
}
这是我的测试,不起作用
@Test
public void whenShouldCheckJsonSrevlet() throws ServletException, IOException {
String fileWay = "D:\\CODE_WORK\\JAVA\\java-a-to-z\\lesson8Aplication\\src\\main\\java\\persistent\\test.txt";
final JSONControllers servlet = new JSONControllers();
HttpServletRequest req = mock(HttpServletRequest.class);
HttpServletResponse resp = mock(HttpServletResponse.class);
PrintWriter writer = new PrintWriter(new FileWriter(fileWay));
BufferedReader reader = new BufferedReader(new FileReader(fileWay));
when(new PrintWriter(resp.getOutputStream())).thenReturn(writer);
when(req.getReader()).thenReturn(reader);
servlet.doGet(req,resp);
servlet.doPost(req,resp);
}
java.lang.NullPointerException
at java.io.Writer.<init>(Writer.java:88)
at java.io.OutputStreamWriter.<init>(OutputStreamWriter.java:109)
at java.io.PrintWriter.<init>(PrintWriter.java:148)
at java.io.PrintWriter.<init>(PrintWriter.java:131)
at servlets.JSONControllersTest.whenShouldCheckJsonSrevlet(JSONControllersTest.java:62)
最佳答案
您要传入映射器的writeValueAsString的对象“列表”是什么? JSONControllersTest.java的哪一行是62?