@PutMapping(value = "/put-file/{requestId}",
        consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.TEXT_PLAIN_VALUE)
    @ResponseStatus(HttpStatus.ACCEPTED)
    public String putFile(@PathVariable String requestId,
        @RequestPart(value = "files") MultipartFile[] files) {
        assert StringUtils.hasText(requestId);
        assert files.length > 0;
        return "ok";
    }

@Test
    void testPutFileSucceeds() throws IOException {
        byte[] file = new ClassPathResource("img.png").getInputStream().readAllBytes();
        String result = given()
            .multiPart("files", "test.png", file, MediaType.IMAGE_PNG_VALUE)
            .contentType(ContentType.MULTIPART)
            .when()
            .put("/put-file/100")
            .then()
            .statusCode(202)
            .extract()
            .response().getBody().asString();

        assertEquals("ok", result);
    }

@Test
    void testPutFileShouldSucceedButFails() throws IOException {
        byte[] file = new ClassPathResource("img.png").getInputStream().readAllBytes();
        String result = given()
            .multiPart("files", "test.png", file, MediaType.IMAGE_PNG_VALUE)
            .contentType(ContentType.MULTIPART)
            .when()
            .put("/put-file/{requestId}", "100")
            .then()
            .statusCode(202)
            .extract()
            .response().getBody().asString();

        assertEquals("ok", result);
    }