Refactor echo resolver

- use current_user method
- add GraphQL type
- add a field options test
- refactor test

app/graphql/resolvers/echo_resolver.rb

@@ -2,15 +2,16 @@
 
 module Resolvers
   class EchoResolver < BaseResolver
+    type ::GraphQL::STRING_TYPE, null: false
     description 'Testing endpoint to validate the API with'
 
     argument    :text, GraphQL::STRING_TYPE, required: true,
                 description: 'Text to echo back'
 
-    def resolve(**args)
-      username = context[:current_user]&.username
+    def resolve(text:)
+      username = current_user&.username
 
-      "#{username.inspect} says: #{args[:text]}"
+      "#{username.inspect} says: #{text}"
     end
   end
 end

spec/graphql/resolvers/echo_resolver_spec.rb

@@ -8,6 +8,13 @@ RSpec.describe Resolvers::EchoResolver do
   let(:current_user) { create(:user) }
   let(:text) { 'Message test' }
 
+  specify do
+    expect(described_class.field_options).to include(
+      type: eq(::GraphQL::STRING_TYPE),
+      null: be_falsey
+    )
+  end
+
   describe '#resolve' do
     it 'echoes text and username' do
       expect(resolve_echo(text)).to eq %Q("#{current_user.username}" says: #{text})

spec/requests/api/graphql_spec.rb

@@ -4,7 +4,7 @@ require 'spec_helper'
 RSpec.describe 'GraphQL' do
   include GraphqlHelpers
 
-  let(:query) { graphql_query_for('echo', 'text' => 'Hello world' ) }
+  let(:query) { graphql_query_for('echo', text: 'Hello world' ) }
 
   context 'logging' do
     shared_examples 'logging a graphql query' do