How to test REST API request (rails) - ruby-on-rails

Question

I have REST API, for example: I already create REST users, for creating user end point is go to "localhost:3000/users" POST method.
So pattern of param should be like this :
:user => {:name => "apple", :address => "heaven"}
My question is :
How to create pattern above, then I test it to endpoint POST method ?
I already test with postman client, but failed because my pattern incorrect (miss root : user)
Thanks

Answer 1

A controller test will catch the type of error you're describing, and is more efficient than an end-to-end test. Example in RSpec:
it 'creates a new user' do
post :create, user: {name: 'apple', address: 'heaven'}, format: 'json'
assert_response :success
expect(response).to render_template(:create)
expect(assigns(:user).name).to eq('apple')
expect(assigns(:user).address).to eq('heaven')
end
I have used curl (in code) to test APIs end-to-end. The Faraday gem would probably work as well.
With the curl request, you'll need to pass the -X POST parameter and a -d parameter for the data. -d can have the following formats:
-d "user[name]=apple" -d "user[address]=heaven"
-d {"user": {"name": "apple", "address": "heaven"}}
You can also pass headers with -H.
Altogether:
curl http://your_url -X POST -H "Content-type: application/json" -d {"user": {"name": "apple", "address": "heaven"}}