如何编写用于PDF文件创建功能的JUnit测试用例

Question

如何编写生成文件并将其放置在某个临时位置的JUnit测试用例。

控制器：

@RequestMapping(value="/generateSalesReport", method=RequestMethod.POST, produces="application/pdf")
public void generateSalesReport(
            @RequestBody SalesReportVO salesReportVO,
            HttpServletRequest request, HttpServletResponse 
                                 response) {
           SalesService.salesService(salesReportVO, request,  response);
}

//Service: SalesService.java
public void salesService(SalesReportVO salesReportVO,
            HttpServletRequest request, HttpServletResponse 
                                 response){
         //access the database and create a PDF and save at temp location
         //fileNameReport -- it is the newly created file name which is returned to Angular page as response text and other get method open this file in browser new tab
         response.getWriter().write(fileNameReport);
}