PUT or POST JSON in a Rails 5 ActionDispatch::IntegrationTest

put_post_json_rails_5_integration_test.md

In Rails 5, the preferred base class for testing controllers is ActionDispatch::IntegrationTest.

If you have an API that receives parameters as JSON request bodies, here are some helper methods to facilitate testing:

class ActionDispatch::IntegrationTest
  def put_json(path, obj)
    put path, params: obj.to_json, headers: { 'CONTENT_TYPE' => 'application/json' }
  end

  def post_json(path, obj)
    post path, params: obj.to_json, headers: { 'CONTENT_TYPE' => 'application/json' }
  end
end

Sample usage:

class MyControllerTest < ActionDispatch::IntegrationTest
  test 'creating a foo' do
    post_json foos_path, foo: { attr_1: 'bar', attr_2: 'baz' }
    assert_response :created
  end
end