text: #include "chapter_09_data_serialization/problem_078_creating_a_pdf_from_a_collection_of_images.h"
  
  #include <gmock/gmock.h>
  #include <gtest/gtest.h>
  
  #include <sstream>  // ostringstream
  
  
  TEST(problem_78_main, DISABLED_output) {
      std::ostringstream oss{};
      problem_78_main(oss);
      EXPECT_THAT(oss.str(), ::testing::ContainsRegex(
          "Writing PDF out to: .*/images.pdf\n"
      ));
  }
  