1 files changed, 49 insertions, 0 deletions
diff --git a/modules/util/rotatingfilewriter/writer_test.go b/modules/util/rotatingfilewriter/writer_test.go
new file mode 100644
index 0000000..5b3b351
--- /dev/null
+++ b/modules/util/rotatingfilewriter/writer_test.go
@@ -0,0 +1,49 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package rotatingfilewriter
+
+import (
+	"compress/gzip"
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCompressOldFile(t *testing.T) {
+	tmpDir := t.TempDir()
+	fname := filepath.Join(tmpDir, "test")
+	nonGzip := filepath.Join(tmpDir, "test-nonGzip")
+
+	f, err := os.OpenFile(fname, os.O_CREATE|os.O_WRONLY, 0o660)
+	require.NoError(t, err)
+	ng, err := os.OpenFile(nonGzip, os.O_CREATE|os.O_WRONLY, 0o660)
+	require.NoError(t, err)
+
+	for i := 0; i < 999; i++ {
+		f.WriteString("This is a test file\n")
+		ng.WriteString("This is a test file\n")
+	}
+	f.Close()
+	ng.Close()
+
+	err = compressOldFile(fname, gzip.DefaultCompression)
+	require.NoError(t, err)
+
+	_, err = os.Lstat(fname + ".gz")
+	require.NoError(t, err)
+
+	f, err = os.Open(fname + ".gz")
+	require.NoError(t, err)
+	zr, err := gzip.NewReader(f)
+	require.NoError(t, err)
+	data, err := io.ReadAll(zr)
+	require.NoError(t, err)
+	original, err := os.ReadFile(nonGzip)
+	require.NoError(t, err)
+	assert.Equal(t, original, data)
+}