message: Added test for string conversion with string_view
diff: @@ -329,6 +329,34 @@ TEST_CASE("value conversion")
  CHECK_THROWS_WITH(json(json::value_t::number_float).get<json::string_t>(),
  "[json.exception.type_error.302] type must be string, but is number");
  }
  +
  +#if defined(JSON_HAS_CPP_17)
  + SECTION("exception in case of a non-string type using string_view")
  + {
  + CHECK_THROWS_AS(json(json::value_t::null).get<std::string_view>(), json::type_error&);
  + CHECK_THROWS_AS(json(json::value_t::object).get<std::string_view>(), json::type_error&);
  + CHECK_THROWS_AS(json(json::value_t::array).get<std::string_view>(), json::type_error&);
  + CHECK_THROWS_AS(json(json::value_t::boolean).get<std::string_view>(), json::type_error&);
  + CHECK_THROWS_AS(json(json::value_t::number_integer).get<std::string_view>(), json::type_error&);
  + CHECK_THROWS_AS(json(json::value_t::number_unsigned).get<std::string_view>(), json::type_error&);
  + CHECK_THROWS_AS(json(json::value_t::number_float).get<std::string_view>(), json::type_error&);
  +
  + CHECK_THROWS_WITH(json(json::value_t::null).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is null");
  + CHECK_THROWS_WITH(json(json::value_t::object).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is object");
  + CHECK_THROWS_WITH(json(json::value_t::array).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is array");
  + CHECK_THROWS_WITH(json(json::value_t::boolean).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is boolean");
  + CHECK_THROWS_WITH(json(json::value_t::number_integer).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is number");
  + CHECK_THROWS_WITH(json(json::value_t::number_unsigned).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is number");
  + CHECK_THROWS_WITH(json(json::value_t::number_float).get<std::string_view>(),
  + "[json.exception.type_error.302] type must be string, but is number");
  + }
  +#endif
  }
  SECTION("get a string (implicit)")
  