Wrote specs for GraphQL root resolvers

spec/lib/graph_ql/root_element_resolver_spec.rb

@@ -0,0 +1,35 @@
+require 'rails_helper'
+
+describe GraphQL::RootElementResolver do
+  let(:comment_resolver) { GraphQL::RootElementResolver.new(Comment) }
+
+  describe '#call' do
+    it 'resolves simple elements' do
+      comment = create(:comment)
+      arguments = { 'id' => comment.id }
+
+      result = comment_resolver.call(nil, arguments, nil)
+
+      expect(result).to eq(comment)
+    end
+
+    it 'returns nil when requested element is forbidden' do
+      proposal = create(:proposal, :hidden)
+      comment = create(:comment, commentable: proposal)
+      arguments = { 'id' => comment.id }
+
+      result = comment_resolver.call(nil, arguments, nil)
+
+      expect(result).to be_nil
+    end
+
+    it 'returns nil when requested element does not exist' do
+      arguments = { 'id' => 1 }
+
+      result = comment_resolver.call(nil, arguments, nil)
+
+      expect(result).to be_nil
+    end
+  end
+
+end