[FIXED] RestController Junit when issue in Spring Boot

Issue

I have an issue to write a RestControler Junit in Spring Boot. I have a problem in listBook in when option.

How can I fix the issue?

Here is the method of restController shown below.

@GetMapping("/search")
    public ResponseEntity<List<BookResponse>> listBook(@RequestParam(name = "size") int size, @RequestParam(name = "page") int page) {
        final Long userID = userService.findInContextUser().getId();
        return ResponseEntity.ok(bookListService.listBooks(size, page, userID));
    }

Here is the test method shown below

@Test
    void itShouldGetBooks_WhenSearch() throws Exception {

        // given - precondition or setup
        BookResponse response1 = BookResponse.builder()
                .title("Book 1")
                .authorName("authorName")
                .build();

        BookResponse response2 = BookResponse.builder()
                .title("Book 1")
                .authorName("authorName2")
                .build();

        List<BookResponse> response = List.of(response1, response2);

        UserDto userDto = UserDto.builder()
                .id(1L)
                .username("username")
                .build();

        // when -  action or the behaviour that we are going test
        when(userService.findInContextUser()).thenReturn(userDto);
        when(bookListService.listBooks(anyInt(), anyInt(), eq(userDto.getId()))).thenReturn(response);

        // then - verify the output
        mockMvc.perform(get("/api/v1/book/search?size=" + anyInt() + "&page=" + anyInt()) // HERE IS THE ERROR LINE
                        .contentType(MediaType.APPLICATION_JSON))
                .andDo(print())
                .andExpect(jsonPath("$", hasSize(2))) // ERROR IS HERE
                .andExpect(status().isOk());
    }

Here is the error message shown below.

    java.lang.AssertionError: JSON path "$"
Expected: a collection with size <2>
     but: was LinkedHashMap <{error=Request processing failed; nested exception is org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Invalid use of argument matchers!
0 matchers expected, 2 recorded:

Solution

Here is the solution shown below.

Change

mockMvc.perform(get("/api/v1/book/search?size=" + anyInt() + "&page=" + anyInt())

to

mockMvc.perform(get("/api/v1/book/search?size=" + 1 + "&page=" + 1)

Answered By - S.N
Answer Checked By - Robin (JavaFixing Admin)