- added test case for list edge case.

src/core/config/transformer/type_merger/snapshots/tailcall__core__config__transformer__type_merger__type_merger__test__list_field_types.snap

@@ -0,0 +1,28 @@
+---
+source: src/core/config/transformer/type_merger/type_merger.rs
+expression: config.to_sdl()
+---
+schema @server(hostname: "0.0.0.0", port: 8000) @upstream(baseURL: "http://jsonplaceholder.typicode.com", httpCache: 42) {
+  query: Query
+}
+
+type F2 {
+  user: [User]
+}
+
+type F3 {
+  user: User
+}
+
+type Query {
+  user(id: Int!): F3 @http(path: "/users/{{.args.id}}")
+  users: F2 @http(path: "/users")
+}
+
+type User {
+  email: String!
+  id: Int!
+  name: String!
+  phone: String
+  username: String!
+}

src/core/config/transformer/type_merger/type_merger.rs

@@ -316,4 +316,12 @@ mod test {
         let config = TypeMerger::default().transform(config).to_result().unwrap();
         insta::assert_snapshot!(config.to_sdl());
     }
+
+    #[test]
+    fn test_list_field_types() {
+        let sdl = std::fs::read_to_string(tailcall_fixtures::configs::USER_LIST).unwrap();
+        let config = Config::from_sdl(&sdl).to_result().unwrap();
+        let config = TypeMerger::default().transform(config).to_result().unwrap();
+        insta::assert_snapshot!(config.to_sdl());
+    }
 }

tailcall-fixtures/fixtures/configs/user-list.graphql

@@ -0,0 +1,26 @@
+schema
+  @server(port: 8000, hostname: "0.0.0.0")
+  @upstream(baseURL: "http://jsonplaceholder.typicode.com", httpCache: 42) {
+  query: Query
+}
+
+type F2 {
+  user: [User]
+}
+
+type F3 {
+  user: User
+}
+
+type User {
+  id: Int!
+  name: String!
+  username: String!
+  email: String!
+  phone: String
+}
+
+type Query {
+  users: F2 @http(path: "/users")
+  user(id: Int!): F3 @http(path: "/users/{{.args.id}}")
+}