diff --git a/modules/git/repo_base_test.go b/modules/git/repo_base_test.go
new file mode 100644
index 0000000000..323b28f476
--- /dev/null
+++ b/modules/git/repo_base_test.go
@@ -0,0 +1,163 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package git
+
+import (
+	"bufio"
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// This unit test relies on the implementation detail of CatFileBatch.
+func TestCatFileBatch(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	repo, err := OpenRepository(ctx, "./tests/repos/repo1_bare")
+	require.NoError(t, err)
+	defer repo.Close()
+
+	var wr WriteCloserError
+	var r *bufio.Reader
+	var cancel1 func()
+	t.Run("Request cat file batch", func(t *testing.T) {
+		assert.Nil(t, repo.batch)
+		wr, r, cancel1, err = repo.CatFileBatch(ctx)
+		require.NoError(t, err)
+		assert.NotNil(t, repo.batch)
+		assert.Equal(t, repo.batch.Writer, wr)
+		assert.True(t, repo.batchInUse)
+	})
+
+	t.Run("Request temporary cat file batch", func(t *testing.T) {
+		wr, r, cancel, err := repo.CatFileBatch(ctx)
+		require.NoError(t, err)
+		assert.NotEqual(t, repo.batch.Writer, wr)
+
+		t.Run("Check temporary cat file batch", func(t *testing.T) {
+			_, err = wr.Write([]byte("95bb4d39648ee7e325106df01a621c530863a653" + "\n"))
+			require.NoError(t, err)
+
+			sha, typ, size, err := ReadBatchLine(r)
+			require.NoError(t, err)
+			assert.Equal(t, "commit", typ)
+			assert.EqualValues(t, []byte("95bb4d39648ee7e325106df01a621c530863a653"), sha)
+			assert.EqualValues(t, 144, size)
+		})
+
+		cancel()
+		assert.True(t, repo.batchInUse)
+	})
+
+	t.Run("Check cached cat file batch", func(t *testing.T) {
+		_, err = wr.Write([]byte("95bb4d39648ee7e325106df01a621c530863a653" + "\n"))
+		require.NoError(t, err)
+
+		sha, typ, size, err := ReadBatchLine(r)
+		require.NoError(t, err)
+		assert.Equal(t, "commit", typ)
+		assert.EqualValues(t, []byte("95bb4d39648ee7e325106df01a621c530863a653"), sha)
+		assert.EqualValues(t, 144, size)
+	})
+
+	t.Run("Cancel cached cat file batch", func(t *testing.T) {
+		cancel1()
+		assert.False(t, repo.batchInUse)
+		assert.NotNil(t, repo.batch)
+	})
+
+	t.Run("Request cached cat file batch", func(t *testing.T) {
+		wr, _, _, err := repo.CatFileBatch(ctx)
+		require.NoError(t, err)
+		assert.NotNil(t, repo.batch)
+		assert.Equal(t, repo.batch.Writer, wr)
+		assert.True(t, repo.batchInUse)
+
+		t.Run("Close git repo", func(t *testing.T) {
+			require.NoError(t, repo.Close())
+			assert.Nil(t, repo.batch)
+		})
+
+		_, err = wr.Write([]byte("95bb4d39648ee7e325106df01a621c530863a653" + "\n"))
+		require.Error(t, err)
+	})
+}
+
+// This unit test relies on the implementation detail of CatFileBatchCheck.
+func TestCatFileBatchCheck(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	repo, err := OpenRepository(ctx, "./tests/repos/repo1_bare")
+	require.NoError(t, err)
+	defer repo.Close()
+
+	var wr WriteCloserError
+	var r *bufio.Reader
+	var cancel1 func()
+	t.Run("Request cat file batch check", func(t *testing.T) {
+		assert.Nil(t, repo.check)
+		wr, r, cancel1, err = repo.CatFileBatchCheck(ctx)
+		require.NoError(t, err)
+		assert.NotNil(t, repo.check)
+		assert.Equal(t, repo.check.Writer, wr)
+		assert.True(t, repo.checkInUse)
+	})
+
+	t.Run("Request temporary cat file batch check", func(t *testing.T) {
+		wr, r, cancel, err := repo.CatFileBatchCheck(ctx)
+		require.NoError(t, err)
+		assert.NotEqual(t, repo.check.Writer, wr)
+
+		t.Run("Check temporary cat file batch check", func(t *testing.T) {
+			_, err = wr.Write([]byte("test" + "\n"))
+			require.NoError(t, err)
+
+			sha, typ, size, err := ReadBatchLine(r)
+			require.NoError(t, err)
+			assert.Equal(t, "tag", typ)
+			assert.EqualValues(t, []byte("3ad28a9149a2864384548f3d17ed7f38014c9e8a"), sha)
+			assert.EqualValues(t, 807, size)
+		})
+
+		cancel()
+		assert.True(t, repo.checkInUse)
+	})
+
+	t.Run("Check cached cat file batch check", func(t *testing.T) {
+		_, err = wr.Write([]byte("test" + "\n"))
+		require.NoError(t, err)
+
+		sha, typ, size, err := ReadBatchLine(r)
+		require.NoError(t, err)
+		assert.Equal(t, "tag", typ)
+		assert.EqualValues(t, []byte("3ad28a9149a2864384548f3d17ed7f38014c9e8a"), sha)
+		assert.EqualValues(t, 807, size)
+	})
+
+	t.Run("Cancel cached cat file batch check", func(t *testing.T) {
+		cancel1()
+		assert.False(t, repo.checkInUse)
+		assert.NotNil(t, repo.check)
+	})
+
+	t.Run("Request cached cat file batch check", func(t *testing.T) {
+		wr, _, _, err := repo.CatFileBatchCheck(ctx)
+		require.NoError(t, err)
+		assert.NotNil(t, repo.check)
+		assert.Equal(t, repo.check.Writer, wr)
+		assert.True(t, repo.checkInUse)
+
+		t.Run("Close git repo", func(t *testing.T) {
+			require.NoError(t, repo.Close())
+			assert.Nil(t, repo.check)
+		})
+
+		_, err = wr.Write([]byte("test" + "\n"))
+		require.Error(t, err)
+	})
+}