Testing for file upload in Spring MVC - mockito

Question

Project setup:
<java.version>1.8</java.version>
<spring.version>4.3.9.RELEASE</spring.version>
<spring.boot.version>1.4.3.RELEASE</spring.boot.version>
We have a REST controller that has a method to upload file like this:
#PostMapping("/spreadsheet/upload")
public ResponseEntity<?> uploadSpreadsheet(#RequestBody MultipartFile file) {
if (null == file || file.isEmpty()) {
return new ResponseEntity<>("please select a file!", HttpStatus.NO_CONTENT);
} else if (blueCostService.isDuplicateSpreadsheetUploaded(file.getOriginalFilename())) {
return new ResponseEntity<>("Duplicate Spreadsheet. Please select a different file to upload",
HttpStatus.CONFLICT);
} else {
try {
saveUploadedFiles(Arrays.asList(file));
} catch (IOException e) {
e.printStackTrace();
return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}
return new ResponseEntity("Successfully uploaded - " + file.getOriginalFilename(), new HttpHeaders(),
HttpStatus.OK);
}
}
UPDATE:
I've tried this approach from an old example I found, but it doesn't compile cleanly, the MockMvcRequestBuilders.multipart method is not defined....
#Test
public void testUploadSpreadsheet_Empty() throws Exception {
String fileName = "EmptySpreadsheet.xls";
String content = "";
MockMultipartFile mockMultipartFile = new MockMultipartFile(
"emptyFile",
fileName,
"text/plain",
content.getBytes());
System.out.println("emptyFile content is '" + mockMultipartFile.toString() + "'.");
mockMvc.perform(MockMvcRequestBuilders.multipart("/bluecost/spreadsheet/upload")
.file("file", mockMultipartFile.getBytes())
.characterEncoding("UTF-8"))
.andExpect(status().isOk());
}

Answer 1

I believe MockMvcRequestBuilders.multipart() is only available since Spring 5. What you want is MockMvcRequestBuilders.fileUpload() that is available in Spring 4.