text: #include "chapter_02_language_features/problem_019_adding_a_range_of_values_to_a_container.h"
  
  #include <gmock/gmock.h>
  #include <gtest/gtest.h>
  
  #include <sstream>  // ostringstream
  
  
  TEST(problem_19_main, DISABLED_output) {
      std::ostringstream oss{};
      problem_19_main(oss);
      EXPECT_THAT(oss.str(), ::testing::HasSubstr(
          "Adding 10, 20, and 30 to an empty vector of ints: [10, 20, 30]\n"
          "Adding \"Hey\", \"Joe!\", and \"Voodoo\" to an empty vector of strings: [\"Hey\", \"Joe!\", \"Voodoo\"]\n"
          "Adding 3.14f, 0.99f, and -273.0f ot an empty list of floats: [3.14, 0.99, -273]\n"
      ));
  }
  