add test for unified exception errors

Author: hos-b

tests/generic/test_bad_access_error.cpp

@@ -0,0 +1,40 @@
+#ifdef REFLECTCPP_USE_STD_EXPECTED
+#include <expected>
+#endif
+
+#include <rfl.hpp>
+#include <gtest/gtest.h>
+
+namespace test_exceptions {
+
+struct Person {
+  rfl::Rename<"firstName", std::string> first_name;
+  rfl::Rename<"lastName", std::string> last_name = "Flanders";
+};
+
+TEST(generic, test_exceptions) {
+  const std::string error_message = "unified bad access message!";
+  #ifdef REFLECTCPP_USE_STD_EXPECTED
+  rfl::Result<Person> person = std::unexpected(rfl::Error(error_message));
+#else
+  rfl::Result<Person> person(rfl::error(error_message));
+#endif
+
+  try {
+    person.value();
+    FAIL() << "Expected an exception!";
+  }
+#ifdef REFLECTCPP_USE_STD_EXPECTED
+  catch (std::bad_expected_access<rfl::Error> const& err) {
+    EXPECT_EQ(err.what(), error_message);
+  }
+#else
+  catch (std::runtime_error const& err) {
+    EXPECT_EQ(err.what(), error_message);
+  }
+#endif
+  catch (...) {
+    FAIL() << "Invalid exception type!";
+  }
+}
+}  // namespace test_exceptions