✅ add tests for binary serialization

test/src/unit-serialization.cpp

@@ -212,13 +212,16 @@ TEST_CASE("dump with binary values")
     SECTION("serialize_binary = false")
     {
         auto binary = json::binary_array({1, 2, 3, 4});
+        auto binary_empty = json::binary_array({});
         json object = {{"key", binary}};
         json array = {"value", 1, binary};
 
         CHECK_THROWS_AS(binary.dump(), json::type_error);
+        CHECK_THROWS_AS(binary_empty.dump(), json::type_error);
         CHECK_THROWS_AS(object.dump(), json::type_error);
         CHECK_THROWS_AS(array.dump(), json::type_error);
         CHECK_THROWS_WITH(binary.dump(), "[json.exception.type_error.317] cannot serialize binary data to text JSON");
+        CHECK_THROWS_WITH(binary_empty.dump(), "[json.exception.type_error.317] cannot serialize binary data to text JSON");
         CHECK_THROWS_WITH(object.dump(), "[json.exception.type_error.317] cannot serialize binary data to text JSON");
         CHECK_THROWS_WITH(array.dump(), "[json.exception.type_error.317] cannot serialize binary data to text JSON");
     }
@@ -226,10 +229,12 @@ TEST_CASE("dump with binary values")
     SECTION("serialize_binary = true")
     {
         auto binary = json::binary_array({1, 2, 3, 4});
+        auto binary_empty = json::binary_array({});
         json object = {{"key", binary}};
         json array = {"value", 1, binary};
 
         CHECK(binary.dump(-1, ' ', false, json::error_handler_t::strict, true) == "b[1,2,3,4]");
+        CHECK(binary_empty.dump(-1, ' ', false, json::error_handler_t::strict, true) == "b[]");
         CHECK(object.dump(-1, ' ', false, json::error_handler_t::strict, true) == "{\"key\":b[1,2,3,4]}");
         CHECK(array.dump(-1, ' ', false, json::error_handler_t::strict, true) == "[\"value\",1,b[1,2,3,4]]");
     }
@@ -237,10 +242,12 @@ TEST_CASE("dump with binary values")
     SECTION("serialize_binary = true, pretty-printed")
     {
         auto binary = json::binary_array({1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20});
+        auto binary_empty = json::binary_array({});
         json object = {{"key", binary}};
         json array = {"value", 1, binary};
 
         CHECK(binary.dump(4, ' ', false, json::error_handler_t::strict, true) == "b[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]");
+        CHECK(binary_empty.dump(4, ' ', false, json::error_handler_t::strict, true) == "b[]");
         CHECK(object.dump(4, ' ', false, json::error_handler_t::strict, true) == "{\n"
               "    \"key\": b[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]\n"
               "}");