Spring MockMvc Post Test: Comparison Failure - spring

Question

I am trying to perfom a Post test on this method with mockito
#RequestMapping(value = "/add", method = RequestMethod.POST)
public String addBookPost(#ModelAttribute("book") Book book, HttpServletRequest request, Model model) {
bookService.save(book);
MultipartFile bookImage = book.getBookImage();
try {
byte[] bytes = bookImage.getBytes();
String name = book.getId() + ".png";
BufferedOutputStream stream = new BufferedOutputStream(
new FileOutputStream(new File("src/main/resources/static/image/book/" + name)));
stream.write(bytes);
stream.close();
} catch (Exception e) {
e.printStackTrace();
}
So far I have done this below but my result shows I have two different instance of the object save , that is the book I save and expect is not the book I am getting .
#Test
public void addBookClicked() throws Exception {
Book book1 = new Book();
// when(bookService.save(anyObject())).thenReturn(anyObject());
mockMvc.perform(post("/book/add").with(user("admin").password("admin").roles("USER", "ADMIN"))
.accept(MediaType.TEXT_HTML)
.contentType(MediaType.TEXT_HTML))
.andExpect(status().is3xxRedirection()).andDo(print())
.andExpect(view().name("redirect:bookList"))
.andReturn();
Mockito.verify(bookService).save(book1);
}
And what can I do with the try and catch block in the test because it also gives an error in test Null pointer - may be because I am not testing or adding image to the test .
error log
MockHttpServletResponse:
Status = 302
Error message = null
Argument(s) are different! Wanted:
com.valentine.service.BookService#0 bean.save(
com.valentine.domain.Book#4acc5dff
);
-> at com.valentine.adminportal.controller.BookControllerTest.addBookClicked(BookControllerTest.java:80)
Actual invocation has different arguments:
com.valentine.service.BookService#0 bean.save(
com.valentine.domain.Book#10c72a6f
);
-> at com.valentine.adminportal.controller.BookController.addBookPost(BookController.java:50)
Comparison Failure: <Click to see difference>
Argument(s) are different! Wanted:
com.valentine.service.BookService#0 bean.save(
com.valentine.domain.Book#4acc5dff
);
-> at com.valentine.adminportal.controller.BookControllerTest.addBookClicked(BookControllerTest.java:80)
Actual invocation has different arguments:
com.valentine.service.BookService#0 bean.save(
com.valentine.domain.Book#10c72a6f
);
-> at com.valentine.adminportal.controller.BookController.addBookPost(BookController.java:50)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.valentine.adminportal.controller.BookControllerTest.addBookClicked(BookControllerTest.java:80)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springf

Answer 1

In addBookClicked you are not actually posting book1 to your controller. The book1 instance in that test method is only referenced (1) where it is created and (2) where it is verified.
You must pass the serialised form of book1 in the body of the mockMvc.perform() invocation.
Here's an example:
mockMvc.perform(post("/book/add")
.with(user("admin").password("admin").roles("USER", "ADMIN"))
.accept(MediaType.TEXT_HTML)
.content(objectMapper.writeValueAsString(book1))
.contentType(MediaType.TEXT_HTML))
.andExpect(status().is3xxRedirection()).andDo(print())
.andExpect(view().name("redirect:bookList"))
.andReturn();
The objectMapper in this example is an instance of Jackson's ObjectMapper and its responsibility is to serialise the book1 instance to JSON for inclusion in the request body.