given: func() Mapper {
				// root (dest port):
				//   <no matches>
				//   fallback (dest ip):
				//     1.2.3.4: chain
				fallback := NewDestinationIP()
				fallback.Map["1.2.3.4"] = ToChain("chain")

				root := NewDestinationPort()
				root.OnNoMatch = ToMatcher(fallback.Matcher)
				return root
			},
			want: func() *matcher.Matcher {
				// root (dest ip):
				//   1.2.3.4: chain

  ClientSession session(root);
  std::vector<Tensor> outputs;

  TF_EXPECT_OK(session.Run({{a, 1}, {b, 41}}, {c}, &outputs));
  test::ExpectTensorEqual<int>(outputs[0], test::AsTensor<int>({42}, {}));
}

TEST(ClientSessionTest, Extend) {
  Scope root = Scope::NewRootScope();
  auto a = Placeholder(root, DT_INT32, Placeholder::Shape({2}));
  auto c = Add(root, a, {2, 2});

                obj: GET_VAR 'a: kotlin.Int declared in <root>.Foo.test.call' type=kotlin.Int origin=null
              CALL 'public final fun consume (obj: kotlin.Any): kotlin.Unit declared in <root>' type=kotlin.Unit origin=null
                obj: GET_VAR '<this>: <root>.Foo declared in <root>.Foo.test' type=<root>.Foo origin=null

        //does not contain unresolved dep, contains root
        modules == [root, dep1.selected, dep2.selected, dep3.selected] as Set
    }

    def "provides hooks for iterating each module or dependency exactly once"() {
        given:
        //root -> dep1,dep2; dep1 -> dep3
        def dep = newDependency('dep1')
        def dep3 = newDependency('dep3')

          }
        }.accept(root);
      }
    };
  }

  UnmodifiableIterator<T> postOrderIterator(T root) {
    return new PostOrderIterator(root);
  }

  private static final class PostOrderNode<T> {
    final T root;
    final Iterator<T> childIterator;

    PostOrderNode(T root, Iterator<T> childIterator) {
      this.root = checkNotNull(root);

        }
        outputContains("configuring root")
        outputContains("creating model with parameter='fetch1' for root project 'root'")
        outputContains("creating model with parameter='fetch2' for root project 'root'")

        and:
        models.keySet() ==~ [":"]
        models.values().every { it.size() == 4 }

        BLOCK_BODY
          CALL 'protected/*protected and package*/ open fun onCreate (): kotlin.Unit declared in p2.Parent' superQualifier='CLASS IR_EXTERNAL_JAVA_DECLARATION_STUB CLASS name:Parent modality:OPEN visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit origin=null
            $this: GET_VAR '<this>: <root>.Child declared in <root>.Child.onCreate' type=<root>.Child origin=null

        VALUE_PARAMETER name:p0 index:0 type:<root>.Foo
        EXPRESSION_BODY
          BLOCK type=kotlin.String origin=null
            CALL 'public final fun <get-foo> (): kotlin.String declared in <root>.Foo' type=kotlin.String origin=GET_PROPERTY

        VALUE_PARAMETER name:p0 index:0 type:<root>.Foo
        EXPRESSION_BODY
          BLOCK type=kotlin.String origin=null
            CALL 'public final fun <get-foo> (): kotlin.String declared in <root>.Foo' type=kotlin.String origin=GET_PROPERTY

        VALUE_PARAMETER name:p0 index:0 type:<root>.A
        EXPRESSION_BODY
          BLOCK type=kotlin.Int origin=null
            CALL 'private final fun foo (): kotlin.Int declared in <root>.A' type=kotlin.Int origin=null