Extend HTTP status assertions

[cms04]

This is an extension for HTTP status assertions in the AbstractHttpServletResponseAssert, which was introduced in version 6.2. With this extension, it is possible to write test assertions like this

MvcTestResult result = mockMvcTester.get().uri("/example").exchange();
assertThat(result).httpStatus().isUnauthorized();

which is inspired by the "old" MockMvc status assertions:

mockMvc.perform(get("/example"))
    .andExpect(status().isUnauthorized());

No breaking changes introduced.

[snicoll]

Thanks for the suggestion @cms04 - We're aware of the lack of support for HttpStatus and did not introduce them on purpose. One reason is to avoid exactly what you're suggesting. By having such assertions there, it breaks the flow if you're trying to assert simple use cases as httpStatus() returns a dedicated assert object.

The "root" assertion object has basic hasStatus methods. I am still not keen to add more there as it would become quite busy in such a high-level object. Taking a step back, why are such narrowed assertions necessary? assertThat(result).httpStatus().isUnauthorized() can be written as assertThat(result).hasStatus(HttpStatus.UNAUTHORIZED) right now and I prefer the latter over the former.