add test coverage for pipelining with groups

Author: dwrensha

capnp-rpc/test/test.capnp

@@ -102,6 +102,10 @@ interface TestPipeline {
 
   struct Box {
     cap @0 :TestInterface;
+
+    foo :group {
+       capInGroup @1 :TestInterface;
+    }
   }
 }
 

capnp-rpc/test/test.rs

@@ -286,6 +286,10 @@ fn basic_pipelining() {
 
         let promise = request.send();
 
+        // This is just here to check that code generation for pipelines
+        // inside of groups works correctly.
+        let _ = promise.pipeline.get_out_box().get_foo().get_cap_in_group();
+
         let mut pipeline_request = promise.pipeline.get_out_box().get_cap().foo_request();
         pipeline_request.get().set_i(321);
         let pipeline_promise = pipeline_request.send();

capnpc/test/test.capnp

@@ -803,4 +803,4 @@ struct Issue260(T, Q) {
     val1 @2 :Q;
     val2 @3 :Int8;
   }
-}
+}