Add test for issue 243

test/CMakeLists.txt

@@ -73,3 +73,7 @@ add_test(NAME issue-149-entry-selection COMMAND issue-149-entry-selection)
 add_executable(issue-189-default-values issue-189-default-values.cpp)
 target_link_libraries(issue-189-default-values nlohmann_json_schema_validator)
 add_test(NAME issue-189-default-values COMMAND issue-189-default-values)
+
+add_executable(issue-243-root-default-values issue-243-root-default-values.cpp)
+target_link_libraries(issue-243-root-default-values nlohmann_json_schema_validator)
+add_test(NAME issue-243-root-default-values COMMAND issue-243-root-default-values)

test/issue-243-root-default-values.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <nlohmann/json-schema.hpp>
+
+using nlohmann::json;
+using nlohmann::json_uri;
+using nlohmann::json_schema::json_validator;
+
+static const json root_default = R"(
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "properties": {
+        "width": {
+            "type": "integer"
+        }
+    },
+    "default": {
+        "width": 42
+    }
+})"_json;
+
+int main(void)
+{
+	json_validator validator{};
+
+	validator.set_root_schema(root_default);
+
+	{
+		json nul_json;
+		if (!nul_json.is_null()) {
+			return 1;
+		}
+
+		const auto default_patch = validator.validate(nul_json);
+
+		if (default_patch.is_null()) {
+			std::cerr << "Patch is null but should contain operation to add defaults to root" << std::endl;
+			return 1;
+		}
+
+		const auto actual = nul_json.patch(default_patch);
+		const auto expected = R"({"width": 42})"_json;
+		if (actual != expected) {
+			std::cerr << "Patch of defaults is wrong for root schema: '" << actual.dump() << "' instead of expected '" << expected.dump() << "'" << std::endl;
+		}
+	}
+
+	return 0;
+}