From d911c70338fa5bcc1e36cd1010c0eec21b65c22d Mon Sep 17 00:00:00 2001
From: Sander Mertens <sander.mertens8@gmail.com>
Date: Wed, 18 Dec 2024 11:20:23 -0800
Subject: [PATCH] #1466 Add test that ensures empty enum reflection works

---
 test/cpp/project.json |  3 ++-
 test/cpp/src/Enum.cpp | 10 ++++++++++
 test/cpp/src/main.cpp |  7 ++++++-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/test/cpp/project.json b/test/cpp/project.json
index c03ff8d5f..abb70ad63 100644
--- a/test/cpp/project.json
+++ b/test/cpp/project.json
@@ -416,7 +416,8 @@
                 "mixed_auto_manual_constants",
                 "enum_class_mixed_auto_manual_constants",
                 "enum_child_count",
-                "multi_world_constant_ids"
+                "multi_world_constant_ids",
+                "empty_enum"
             ]
         }, {
             "id": "Union",
diff --git a/test/cpp/src/Enum.cpp b/test/cpp/src/Enum.cpp
index 509ba178c..e55f7173f 100644
--- a/test/cpp/src/Enum.cpp
+++ b/test/cpp/src/Enum.cpp
@@ -90,6 +90,8 @@ enum class EnumClassWithLargeConstant {
     X, Y, Z = 1000
 };
 
+enum EmptyEnum { };
+
 /* Optional, but improves compile time */
 FLECS_ENUM_LAST(StandardEnum, Blue)
 FLECS_ENUM_LAST(SparseEnum, Grey)
@@ -1205,3 +1207,11 @@ void Enum_multi_world_constant_ids(void) {
     test_assert(green_a == world_a.to_entity(StandardEnum::Green));
     test_assert(blue_a == world_a.to_entity(StandardEnum::Blue));
 }
+
+void Enum_empty_enum(void) {
+    flecs::world ecs;
+
+    auto enum_type = flecs::enum_type<EmptyEnum>(ecs);
+    
+    test_int(enum_type.index_by_value(0), -1);
+}
diff --git a/test/cpp/src/main.cpp b/test/cpp/src/main.cpp
index cb47f881c..6a2b7a0de 100644
--- a/test/cpp/src/main.cpp
+++ b/test/cpp/src/main.cpp
@@ -405,6 +405,7 @@ void Enum_mixed_auto_manual_constants(void);
 void Enum_enum_class_mixed_auto_manual_constants(void);
 void Enum_enum_child_count(void);
 void Enum_multi_world_constant_ids(void);
+void Enum_empty_enum(void);
 
 // Testsuite 'Union'
 void Union_add_case(void);
@@ -2980,6 +2981,10 @@ bake_test_case Enum_testcases[] = {
     {
         "multi_world_constant_ids",
         Enum_multi_world_constant_ids
+    },
+    {
+        "empty_enum",
+        Enum_empty_enum
     }
 };
 
@@ -6926,7 +6931,7 @@ static bake_test_suite suites[] = {
         "Enum",
         NULL,
         NULL,
-        40,
+        41,
         Enum_testcases
     },
     {