GraphDef gdef;
  GetGraphDef(host_graph_, &gdef);
  std::vector<std::string> func_names = GetFuncNames(gdef);
  ASSERT_EQ(2, func_names.size());
  ASSERT_EQ(func_name_, func_names[0]);
  ASSERT_EQ("MyGrad", func_names[1]);
  std::vector<std::pair<std::string, std::string>> grads = GetGradDefs(gdef);
  ASSERT_EQ(1, grads.size());
  ASSERT_EQ(func_name_, grads[0].first);
  ASSERT_EQ("MyGrad", grads[0].second);

}

// Execute f on each test case.  funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep []byte) int, funcName string, testCases []BinOpTest) {
	for _, test := range testCases {
		a := []byte(test.a)
		b := []byte(test.b)
		actual := f(a, b)
		if actual != test.i {
			t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, b, actual, test.i)
		}
	}

            ctx["file"] = source_file
        if (line_number := inspect.getsourcelines(func)[1]) is not None:
            ctx["line"] = line_number
        if (func_name := getattr(func, "__name__", None)) is not None:
            ctx["function"] = func_name
    except Exception:
        ctx = EndpointContext()

    _endpoint_context_cache[func_id] = ctx
    return ctx


async def serialize_response(
    *,