[GQL] Test helpers: support #ready? usage

This ensures that we call the resolver's `#ready?` method during tests
in a way that mimics the framework. This allows resolvers to start using
`#ready?` and continue to make use of our helpers.

spec/support/helpers/graphql_helpers.rb

@@ -11,9 +11,19 @@ module GraphqlHelpers
     underscored_field_name.to_s.camelize(:lower)
   end
 
-  # Run a loader's named resolver
+  # Run a loader's named resolver in a way that closely mimics the framework.
+  #
+  # First the `ready?` method is called. If it turns out that the resolver is not
+  # ready, then the early return is returned instead.
+  #
+  # Then the resolve method is called.
   def resolve(resolver_class, obj: nil, args: {}, ctx: {}, field: nil)
-    resolver_class.new(object: obj, context: ctx, field: field).resolve(args)
+    resolver = resolver_class.new(object: obj, context: ctx, field: field)
+    ready, early_return = sync_all { resolver.ready?(**args) }
+
+    return early_return unless ready
+
+    resolver.resolve(args)
   end
 
   # Eagerly run a loader's named resolver
@@ -51,12 +61,12 @@ module GraphqlHelpers
   # BatchLoader::GraphQL returns a wrapper, so we need to :sync in order
   # to get the actual values
   def batch_sync(max_queries: nil, &blk)
-    wrapper = proc do
-      lazy_vals = yield
-      lazy_vals.is_a?(Array) ? lazy_vals.map { |val| sync(val) } : sync(lazy_vals)
-    end
+    batch(max_queries: max_queries) { sync_all(&blk) }
+  end
 
-    batch(max_queries: max_queries, &wrapper)
+  def sync_all(&blk)
+    lazy_vals = yield
+    lazy_vals.is_a?(Array) ? lazy_vals.map { |val| sync(val) } : sync(lazy_vals)
   end
 
   def graphql_query_for(name, attributes = {}, fields = nil)