✅ improved test coverage

test/src/unit-comparison.cpp

@@ -31,6 +31,14 @@ SOFTWARE.
 #include "json.hpp"
 using nlohmann::json;
 
+// helper function to check std::less<json::value_t>
+// see http://en.cppreference.com/w/cpp/utility/functional/less
+template <typename A, typename B, typename U = std::less<json::value_t>>
+bool f(A a, B b, U u = U())
+{
+    return u(a, b);
+}
+
 TEST_CASE("lexicographical comparison operators")
 {
     SECTION("types")
@@ -69,6 +77,7 @@ TEST_CASE("lexicographical comparison operators")
                     CAPTURE(j);
                     // check precomputed values
                     CHECK(operator<(j_types[i], j_types[j]) == expected[i][j]);
+                    CHECK(f(j_types[i], j_types[j]) == expected[i][j]);
                 }
             }
         }

test/src/unit-deserialization.cpp

@@ -359,6 +359,13 @@ TEST_CASE("deserialization")
                 CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error);
                 CHECK(not json::accept(std::begin(v), std::end(v)));
             }
+
+            SECTION("case 16")
+            {
+                uint8_t v[] = {'{', '1', ',', ','};
+                CHECK_THROWS_AS(json::parse(std::begin(v), std::end(v)), json::parse_error);
+                CHECK(not json::accept(std::begin(v), std::end(v)));
+            }
         }
     }
 }