Check if response is JSON in RSpec

Question

I thought this would be simple, but I can't find how to do it.

All I want to do is write a spec that passes if a json file is returned instead of an HTML file.

This is what my test looks like right now:

 require 'spec_helper' describe "sessions" do before do @program =FactoryGirl.create(:program) @user = FactoryGirl.create(:user) end describe "user" do it "is logged in" do post "/api/v1/login", user_login: {email: @user.email, password: @user.password } response.status.should be(201) # response.format.should be(:json) # Can I do something like this? end end end

Why do you care? The format isn't really worth testing, in my opinion. Instead, you can check whether the response contains the necessary data; the actual format used to transport the data is irrelevant. — user229044
– user229044 ♦, Commented Oct 9, 2013 at 19:17
I thought it would be the simplest way to know that my iOS app was getting the format it needed instead of an HTTP error page or something. — Arel
– Arel, Commented Oct 9, 2013 at 19:20
I want to make sure that I am getting the JSON response instead of a web page as a response. Since both would return 201, can you recommend what you would test for? — Arel
– Arel, Commented Oct 9, 2013 at 19:26
FYI, JSON-schema is an interesting tool for taking this further. You can check if the JSON has the right data in the right structure. — Dogweather
– Dogweather, Commented Oct 9, 2013 at 19:33

Edgars Jekabsons · Accepted Answer · 2013-10-09 19:31:38Z

I suggest You to check the actual content as meagar already noted. In my projects I have used this gem for easier matching: https://github.com/collectiveidea/json_spec

It provides handy matchers to easy match json content: be_json_eql include_json have_json_path have_json_type have_json_size

response.body.should include_json("some_field: 'it definitely has'")

Got MultiJson::LoadError: 795: unexpected token at 'success: 'true'' do i frogot something?

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