message: fixes math#1852. Fixes deprecation warning in Google Test
diff: @@ -45,7 +45,7 @@ class CmdStanArgumentsSingleton : public ::testing::Test {
  std::stringstream ss;
  };
  -TYPED_TEST_CASE_P(CmdStanArgumentsSingleton);
  +TYPED_TEST_SUITE_P(CmdStanArgumentsSingleton);
  TYPED_TEST_P(CmdStanArgumentsSingleton, constructor) {
  // test fixture would have created the argument
  @@ -140,11 +140,11 @@ TYPED_TEST_P(CmdStanArgumentsSingleton, argument_lookup) {
  // EXPECT_EQ(0, this->arg->arg("foo"));
  }
  -REGISTER_TYPED_TEST_CASE_P(CmdStanArgumentsSingleton, constructor, name,
  +REGISTER_TYPED_TEST_SUITE_P(CmdStanArgumentsSingleton, constructor, name,
  description, print, print_help, parse_args,
  parse_args_unexpected, argument_lookup);
  -INSTANTIATE_TYPED_TEST_CASE_P(real, CmdStanArgumentsSingleton, double);
  -INSTANTIATE_TYPED_TEST_CASE_P(int, CmdStanArgumentsSingleton, int);
  -INSTANTIATE_TYPED_TEST_CASE_P(bool, CmdStanArgumentsSingleton, bool);
  -INSTANTIATE_TYPED_TEST_CASE_P(string, CmdStanArgumentsSingleton, std::string);
  +INSTANTIATE_TYPED_TEST_SUITE_P(real, CmdStanArgumentsSingleton, double);
  +INSTANTIATE_TYPED_TEST_SUITE_P(int, CmdStanArgumentsSingleton, int);
  +INSTANTIATE_TYPED_TEST_SUITE_P(bool, CmdStanArgumentsSingleton, bool);
  +INSTANTIATE_TYPED_TEST_SUITE_P(string, CmdStanArgumentsSingleton, std::string);
  