message: Added test for conversion to string_view
diff: @@ -39,6 +39,10 @@ using nlohmann::json;
  #include <unordered_set>
  #include <valarray>
  +#if defined(JSON_HAS_CPP_17)
  +#include <string_view>
  +#endif
  +
  TEST_CASE("value conversion")
  {
  SECTION("get an object (explicit)")
  @@ -292,6 +296,13 @@ TEST_CASE("value conversion")
  std::string s = j.get<std::string>();
  CHECK(json(s) == j);
  }
  +#if defined(JSON_HAS_CPP_17)
  + SECTION("std::string_view")
  + {
  + std::string_view s = j.get<std::string_view>();
  + CHECK(json(s) == j);
  + }
  +#endif
  SECTION("exception in case of a non-string type")
  {
  @@ -331,6 +342,14 @@ TEST_CASE("value conversion")
  CHECK(json(s) == j);
  }
  +#if defined(JSON_HAS_CPP_17)
  + SECTION("std::string_view")
  + {
  + std::string_view s = j;
  + CHECK(json(s) == j);
  + }
  +#endif
  +
  SECTION("std::string")
  {
  std::string s = j;
  