NoMethodError: undefined method `[]' for nil:NilClass for POST on resource

[lalitchandnani]

I'm using airborne to write test cases around APIs i've created and it works great except a scenario when i'm trying to pass an empty json for a POST endpoint which has some of parameters as required. I'm using grape to create REST APIs.

Example:

describe "Empty POST on Resource" do
      let(:req_params) {
        {
        }
      }
      it "fails to create a new lead" do
        post "/v1/resource/", req_params
        expect(response).to have_http_status(422)
      end
    end

I'm receiving following response, if required fields are not present in test case.

 undefined method `[]' for nil:NilClass
     # /path/to/directory/api/exceptions.rb:43:in `notify'
     #/path/to/directory/api/base.rb:104:in `block (2 levels) in <module:Base>'
     # ./spec/api/pulpit/api_v1_spec.rb:62:in `block (4 levels) in <top (required)>'

However, If i make mandatory params in api as optional, things work fine. Not sure why.