text: #include <math/test_ad.hpp>
  
  TEST(mathMixMatFun, round) {
    auto f = [](const auto& x1) { return stan::math::round(x1); };
    // can't autodiff round through integers
    for (auto x : stan::test::internal::common_nonzero_args())
      stan::test::expect_unary_vectorized(f, x);
    stan::test::expect_unary_vectorized(f, -2.6, -0.2, 0.4, 1.49, 1.51, 2.4);
  }
  