FilePart filePart = (FilePart) part; assertEquals("a.txt", filePart.filename()); assertEquals(MediaType.TEXT_PLAIN, filePart.headers().getContentType()); }) .consumeNextWith(part -> { FilePart filePart = (FilePart) part; assertEquals("a.html", filePart.filename()); assertEquals(MediaType.TEXT_HTML, filePart.headers().getContentType()); }) .expectComplete()