From 4ee088b1a87625bbc7595bba50b2ab05f0ccc7cc Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Thu, 24 Sep 2026 20:44:52 +0200
Subject: tests: add TestUnlinkedO_SYNC

Relates-to: #1023
https://github.com/rfjakob/gocryptfs/issues/1023
---
 tests/matrix/matrix_test.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tests/matrix/matrix_test.go b/tests/matrix/matrix_test.go
index a2ec549..2f097fb 100644
--- a/tests/matrix/matrix_test.go
+++ b/tests/matrix/matrix_test.go
@@ -993,3 +993,18 @@ func TestRenameExchangeOnGocryptfs(t *testing.T) {
 		t.Errorf("file2 content wrong after exchange. Expected: %s, Got: %s", content1, newContent2)
 	}
 }
+
+func TestUnlinkedO_SYNC(t *testing.T) {
+	path := test_helpers.DefaultPlainDir + "/" + t.Name()
+	fd, err := syscall.Open(path, syscall.O_CREAT|syscall.O_RDWR|syscall.O_SYNC, 0600)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer syscall.Close(fd)
+	if err = os.Remove(path); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = syscall.Write(fd, make([]byte, 10)); err != nil {
+		t.Error(err)
+	}
+}
-- 
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