test nested streams

Author: rmosolgo

spec/graphql/execution/deferred_execution_spec.rb

@@ -265,6 +265,22 @@ def merged_result
       assert_equal({"id"=>3}, collector.patches[3][:value])
     end
 
+    describe "lists inside @streamed lists" do
+      let(:query_string) {%|
+      {
+        milks @stream {
+          flavors
+        }
+      }
+      |}
+
+      it "streams the outer list but sends the inner list wholesale" do
+        result
+        # One with an empty list, then 2 patches
+        assert_equal(3, collector.patches.length)
+      end
+    end
+
     describe "nested defers" do
       let(:query_string) {%|
       {

spec/support/dairy_app.rb

@@ -254,6 +254,9 @@ def self.create(type:, data:)
     resolve -> (obj, args, ctx) { CHEESES.values }
   end
   field :milk, field: FetchField.create(type: MilkType, data: MILKS, id_type: !types.ID)
+  field :milks, types[MilkType] do
+    resolve -> (obj, args, ctx) { MILKS.values }
+  end
   field :dairy, field: SingletonField.create(type: DairyType, data: DAIRY)
   field :fromSource, &SourceFieldDefn
   field :favoriteEdible, FavoriteFieldDefn

spec/support/dairy_data.rb

@@ -10,6 +10,7 @@
 Milk = Struct.new(:id, :fatContent, :origin, :source, :flavors)
 MILKS = {
   1 => Milk.new(1, 0.04, "Antiquity", 1, ["Natural", "Chocolate", "Strawberry"]),
+  2 => Milk.new(2, 0.02, "Antiquity", 1, ["Natural"]),
 }
 
 DAIRY = OpenStruct.new(