From 67441c482377a92c7c3976ca4e51fd210c75de29 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 1 Sep 2024 13:31:37 +0900
Subject: [PATCH] internal/testing: avoid os.Exit(0)

os.Exit(0) might cause test flakiness.

https://github.com/hajimehoshi/ebiten/actions/runs/10650734256/job/29522689113

```
panic: unexpected call to os.Exit(0) during test

goroutine 1 [running]:
os.Exit(0x0)
	/opt/hostedtoolcache/go/1.23.0/x64/src/os/proc.go:67 +0x8
github.com/hajimehoshi/ebiten/v2/internal/testing.MainWithRunLoop(0x19b28c0)
	/home/runner/work/ebiten/ebiten/internal/testing/testing.go:50 +0xa
github.com/hajimehoshi/ebiten/v2/internal/graphicscommand_test.TestMain(...)
	/home/runner/work/ebiten/ebiten/internal/graphicscommand/image_test.go:42
main.main()
	_testmain.go:55 +0x5
```
---
 internal/testing/testing.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/internal/testing/testing.go b/internal/testing/testing.go
index cea545eb0..bea6f2ce9 100644
--- a/internal/testing/testing.go
+++ b/internal/testing/testing.go
@@ -47,5 +47,7 @@ func MainWithRunLoop(m *testing.M) {
 	if err := ebiten.RunGame(g); err != nil {
 		panic(err)
 	}
-	os.Exit(g.code)
+	if g.code != 0 {
+		os.Exit(g.code)
+	}
 }