output: #fixed code
                               @Test
  	public void testPostBinaryUTF8() throws URISyntaxException {
  		HttpResponse<JsonNode> response = Unirest.post(MockServer.POST)
  				.header("Accept", ContentType.MULTIPART_FORM_DATA.getMimeType())
  				.field("param3", "こんにちは")
  				.field("file", new File(getClass().getResource("/test").toURI()))
  				.asJson();
  
  		FormCapture json = TestUtils.read(response, FormCapture.class);
  		json.assertQuery("param3", "こんにちは");
  		json.getFile("test").assertBody("This is a test file");
  	}
input: #vulnerable code 
                               @Test
  	public void testPostBinaryUTF8() throws URISyntaxException {
  		HttpResponse<JsonNode> response = Unirest.post("http://httpbin.org/post").field("param3", "こんにちは").field("file", new File(getClass().getResource("/test").toURI())).asJson();
  
  		assertEquals("This is a test file", response.getBody().getObject().getJSONObject("files").getString("file"));
  		assertEquals("こんにちは", response.getBody().getObject().getJSONObject("form").getString("param3"));
  	} 
                              #location 5 
                              #vulnerability type NULL_DEREFERENCE