Add Test Case

codegen/testserver/nulls.graphql

@@ -1,5 +1,6 @@
 extend type Query {
     errorBubble: Error
+    errorBubbleList: [Error!]
     errors: Errors
     valid: String!
 }

codegen/testserver/nulls_test.go

@@ -14,13 +14,15 @@ func TestNullBubbling(t *testing.T) {
 	resolvers.QueryResolver.Valid = func(ctx context.Context) (s string, e error) {
 		return "Ok", nil
 	}
-
 	resolvers.QueryResolver.Errors = func(ctx context.Context) (errors *Errors, e error) {
 		return &Errors{}, nil
 	}
 	resolvers.QueryResolver.ErrorBubble = func(ctx context.Context) (i *Error, e error) {
 		return &Error{ID: "E1234"}, nil
 	}
+	resolvers.QueryResolver.ErrorBubbleList = func(ctx context.Context) (i []*Error, e error) {
+		return []*Error{nil}, nil
+	}
 
 	c := client.New(handler.NewDefaultServer(NewExecutableSchema(Config{Resolvers: resolvers})))
 
@@ -68,6 +70,18 @@ func TestNullBubbling(t *testing.T) {
 		require.Equal(t, "Ok", resp.Valid)
 	})
 
+	t.Run("when non-null list element is null", func(t *testing.T) {
+		var resp struct {
+			Valid           string
+			ErrorBubbleList []*struct{}
+		}
+		err := c.Post(`query { valid, errorBubbleList { id } }`, &resp)
+
+		require.EqualError(t, err, `[{"message":"must not be null","path":["errorBubbleList", 0]}]`)
+		require.Nil(t, resp.ErrorBubbleList)
+		require.Equal(t, "Ok", resp.Valid)
+	})
+
 	t.Run("null args", func(t *testing.T) {
 		var resp struct {
 			NullableArg *string

codegen/testserver/resolver.go

@@ -232,6 +232,10 @@ func (r *queryResolver) ErrorBubble(ctx context.Context) (*Error, error) {
 	panic("not implemented")
 }
 
+func (r *queryResolver) ErrorBubbleList(ctx context.Context) ([]*Error, error) {
+	panic("not implemented")
+}
+
 func (r *queryResolver) Errors(ctx context.Context) (*Errors, error) {
 	panic("not implemented")
 }

codegen/testserver/slices.graphql

@@ -4,10 +4,10 @@ extend type Query {
 }
 
 type Slices {
-  test1: [String]
-  test2: [String!]
-  test3: [String]!
-  test4: [String!]!
+    test1: [String]
+    test2: [String!]
+    test3: [String]!
+    test4: [String!]!
 }
 
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