How to use spring's MockMultipartHttpServletRequest? Getting “no multipart boundary was found”

Question

Clearly I\'m not using this test fixture right. My servlet works just fine in tomcat, but when I try to use this mock, the multi-part boundary is not found. \"the request

Answer 1

My way to test multipart/form-data via mock MVC sending params and files is the following:

    @Test
void testSendFeedback() throws Exception {
    var builder = MockMvcRequestBuilders.multipart(URL_PATH);

    Path path = Files.createTempFile("test-file", "tmp");
    builder = builder.part(new MockPart("image", path.toFile().getName(), Files.readAllBytes(path)));

    builder.param("field1", "value1")
        .param("fields2", "value2");

    mockMvc.perform(builder.header(HttpHeaders.AUTHORIZATION, YOUR_AUTH_VALUE).contentType(MediaType.MULTIPART_FORM_DATA_VALUE))
        .andDo(print())
        .andExpect(status().isNoContent());
}