Setting request parts in spring test mvc

Issue

I'm trying to test (through Spring test (mvc)) a controller that uses servletRequest.getParts()

All I've read so far is that MockMvcRequestBuilders.fileUpload().file() is the solution. However I cannot make it work. I wrote the following test which fails

MockMultipartHttpServletRequestBuilder builder = MockMvcRequestBuilders.fileUpload("/foo")
            .file(new MockMultipartFile("file", new byte[] { 1, 2, 3, 4 }));
MockHttpServletRequest rq = builder.buildRequest(null);
Assert.assertEquals(1, rq.getParts().size()); // result 0

I went through spring code, and the call to file(...) adds an element in List<MockMultipartFile> when getParts() gets its elements from another list (Map<String, Part> parts)

There must be another way to do it...

Edit 1

The code I'm using to test the controller is :

ResultActions result = mockMvc.perform(
            MockMvcRequestBuilders.fileUpload(new URI("/url")).file("param", "expected".getBytes()))

Solution

There is currently no support for testing with javax.servlet.http.Part in the Spring MVC Test Framework.

Consequently, I have introduced two tickets to address this shortcoming in Spring Framework 5.0:

• https://jira.spring.io/browse/SPR-14252
• https://jira.spring.io/browse/SPR-14253

In the interim, you should be able to mock Part yourself and register it in the prepared MockHttpServletRequest via a custom RequestPostProcessor.

Regards,

Sam (author of the Spring TestContext Framework)

Answered By - Sam Brannen