message: Add test cases for iterator to const iterator conversion
diff: @@ -1511,4 +1511,56 @@ TEST_CASE("iterators 1")
  }
  }
  }
  +
  + SECTION("conversion from iterator to const iterator")
  + {
  + SECTION("boolean")
  + {
  + json j = true;
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("string")
  + {
  + json j = "hello world";
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("array")
  + {
  + json j = {1, 2, 3};
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("object")
  + {
  + json j = {{"A", 1}, {"B", 2}, {"C", 3}};
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("number (integer)")
  + {
  + json j = 23;
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("number (unsigned)")
  + {
  + json j = 23u;
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("number (float)")
  + {
  + json j = 23.42;
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + SECTION("null")
  + {
  + json j = nullptr;
  + json::const_iterator it = j.begin();
  + CHECK(it == j.cbegin());
  + }
  + }
  }
  