yaml-cpp/test/integration/error_messages_test.cpp

#include "yaml-cpp/yaml.h"  // IWYU pragma: keep

#include "gtest/gtest.h"

#define EXPECT_THROW_EXCEPTION(exception_type, statement, message) \
  ASSERT_THROW(statement, exception_type);                         \
  try {                                                            \
    statement;                                                     \
  } catch (const exception_type& e) {                              \
    EXPECT_EQ(e.msg, message);                                     \
  }

namespace YAML {
namespace {

TEST(ErrorMessageTest, BadSubscriptErrorMessage) {
  const char *example_yaml = "first:\n"
                             "   second: 1\n"
                             "   third: 2\n";

  Node doc = Load(example_yaml);

  // Test that printable key is part of error message
  EXPECT_THROW_EXCEPTION(YAML::BadSubscript, doc["first"]["second"]["fourth"],
                         "operator[] call on a scalar (key: \"fourth\")");
  
  EXPECT_THROW_EXCEPTION(YAML::BadSubscript, doc["first"]["second"][37],
                         "operator[] call on a scalar (key: \"37\")");


  // Non-printable key is not included in error message
  EXPECT_THROW_EXCEPTION(YAML::BadSubscript,
                         doc["first"]["second"][std::vector<int>()],
                         "operator[] call on a scalar");

  EXPECT_THROW_EXCEPTION(YAML::BadSubscript, doc["first"]["second"][Node()],
                         "operator[] call on a scalar");
}

TEST(ErrorMessageTest, Ex9_1_InvalidNodeErrorMessage) {
  const char *example_yaml = "first:\n"
                             "   second: 1\n"
                             "   third: 2\n";

  const Node doc = Load(example_yaml);

  // Test that printable key is part of error message
  EXPECT_THROW_EXCEPTION(YAML::InvalidNode, doc["first"]["fourth"].as<int>(),
                         "invalid node; first invalid key: \"fourth\"");
  
  EXPECT_THROW_EXCEPTION(YAML::InvalidNode, doc["first"][37].as<int>(),
                         "invalid node; first invalid key: \"37\"");
 
  // Non-printable key is not included in error message
  EXPECT_THROW_EXCEPTION(YAML::InvalidNode,
                         doc["first"][std::vector<int>()].as<int>(),
                         "invalid node; this may result from using a map "
                         "iterator as a sequence iterator, or vice-versa");
}
}   
}