diff --git a/models/policy.go b/models/policy.go
index e05080e..5a4ec78 100644
--- a/models/policy.go
+++ b/models/policy.go
@@ -68,7 +68,6 @@ func GetPolicyByID(ID interface{}) (Policy, error) {
 }
 
 // IsDirectlyPreview 返回此策略下文件是否可以直接预览（不需要重定向）
-// TODO 测试
 func (policy *Policy) IsDirectlyPreview() bool {
 	return policy.Type == "local"
 }
diff --git a/models/policy_test.go b/models/policy_test.go
index 7cc3bc0..584fe2f 100644
--- a/models/policy_test.go
+++ b/models/policy_test.go
@@ -133,3 +133,11 @@ func TestPolicy_GenerateFileName(t *testing.T) {
 	testPolicy.FileNameRule = "{uid}123{originname}"
 	asserts.Equal("1123{filename}{.suffix}", testPolicy.GenerateFileName(1, ""))
 }
+
+func TestPolicy_IsDirectlyPreview(t *testing.T) {
+	asserts := assert.New(t)
+	policy := Policy{Type: "local"}
+	asserts.True(policy.IsDirectlyPreview())
+	policy.Type = "remote"
+	asserts.False(policy.IsDirectlyPreview())
+}
diff --git a/pkg/filesystem/file.go b/pkg/filesystem/file.go
index ae19daa..1537719 100644
--- a/pkg/filesystem/file.go
+++ b/pkg/filesystem/file.go
@@ -88,7 +88,6 @@ func (fs *FileSystem) GetPhysicalFileContent(ctx context.Context, path string) (
 }
 
 // Preview 预览文件
-// TODO 测试
 func (fs *FileSystem) Preview(ctx context.Context, path string) (*response.ContentResponse, error) {
 	err := fs.resetFileIfNotExist(ctx, path)
 	if err != nil {
@@ -106,6 +105,7 @@ func (fs *FileSystem) Preview(ctx context.Context, path string) (*response.Conte
 			Content:  resp,
 		}, nil
 	}
+
 	// 否则重定向到签名的预览URL
 	ttl, err := strconv.ParseInt(model.GetSettingByName("preview_timeout"), 10, 64)
 	if err != nil {
@@ -116,12 +116,10 @@ func (fs *FileSystem) Preview(ctx context.Context, path string) (*response.Conte
 				err,
 			)
 	}
-
 	previewURL, err := fs.signURL(ctx, &fs.FileTarget[0], ttl, false)
 	if err != nil {
 		return nil, err
 	}
-
 	return &response.ContentResponse{
 		Redirect: true,
 		URL:      previewURL,
diff --git a/pkg/filesystem/file_test.go b/pkg/filesystem/file_test.go
index 0c63c45..50175f3 100644
--- a/pkg/filesystem/file_test.go
+++ b/pkg/filesystem/file_test.go
@@ -403,14 +403,14 @@ func TestFileSystem_GetDownloadURL(t *testing.T) {
 			WithArgs(1).
 			WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow(1))
 		mock.ExpectQuery("SELECT(.+)").WillReturnRows(sqlmock.NewRows([]string{"id", "name", "policy_id"}).AddRow(1, "1.txt", 1))
-		// 相关设置
-		mock.ExpectQuery("SELECT(.+)").WithArgs("download_timeout").WillReturnRows(sqlmock.NewRows([]string{"id", "value"}).AddRow(1, "20"))
 		// 查找上传策略
 		mock.ExpectQuery("SELECT(.+)").
 			WillReturnRows(
 				sqlmock.NewRows([]string{"id", "type", "is_origin_link_enable"}).
 					AddRow(35, "local", true),
 			)
+		// 相关设置
+		mock.ExpectQuery("SELECT(.+)").WithArgs("download_timeout").WillReturnRows(sqlmock.NewRows([]string{"id", "value"}).AddRow(1, "20"))
 		mock.ExpectQuery("SELECT(.+)").WithArgs("siteURL").WillReturnRows(sqlmock.NewRows([]string{"id", "value"}).AddRow(1, "https://cloudreve.org"))
 		downloadURL, err := fs.GetDownloadURL(ctx, "/1.txt", "download_timeout")
 		asserts.NoError(mock.ExpectationsWereMet())
@@ -490,3 +490,105 @@ func TestFileSystem_GetPhysicalFileContent(t *testing.T) {
 		asserts.NotNil(rs)
 	}
 }
+
+func TestFileSystem_Preview(t *testing.T) {
+	asserts := assert.New(t)
+	ctx := context.Background()
+
+	// 文件不存在
+	{
+		fs := FileSystem{
+			User: &model.User{},
+		}
+		mock.ExpectQuery("SELECT(.+)").WillReturnRows(sqlmock.NewRows([]string{"id"}))
+		resp, err := fs.Preview(ctx, "/1.txt")
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.Error(err)
+		asserts.Nil(resp)
+	}
+
+	// 直接返回文件内容,找不到文件
+	{
+		fs := FileSystem{
+			User: &model.User{},
+		}
+		fs.FileTarget = []model.File{
+			{
+				PolicyID: 1,
+				Policy: model.Policy{
+					Model: gorm.Model{ID: 1},
+					Type:  "local",
+				},
+			},
+		}
+		resp, err := fs.Preview(ctx, "/1.txt")
+		asserts.Error(err)
+		asserts.Nil(resp)
+	}
+
+	// 直接返回文件内容
+	{
+		fs := FileSystem{
+			User: &model.User{},
+		}
+		fs.FileTarget = []model.File{
+			{
+				SourceName: "tests/file1.txt",
+				PolicyID:   1,
+				Policy: model.Policy{
+					Model: gorm.Model{ID: 1},
+					Type:  "local",
+				},
+			},
+		}
+		resp, err := fs.Preview(ctx, "/1.txt")
+		asserts.NoError(err)
+		asserts.NotNil(resp)
+		asserts.False(resp.Redirect)
+		asserts.NoError(resp.Content.Close())
+	}
+
+	// 需要重定向，无法解析有效期设置
+	{
+		fs := FileSystem{
+			User: &model.User{},
+		}
+		fs.FileTarget = []model.File{
+			{
+				SourceName: "tests/file1.txt",
+				PolicyID:   1,
+				Policy: model.Policy{
+					Model: gorm.Model{ID: 1},
+					Type:  "remote",
+				},
+			},
+		}
+		asserts.NoError(cache.Set("setting_preview_timeout", "test", 0))
+		resp, err := fs.Preview(ctx, "/1.txt")
+		asserts.Error(err)
+		asserts.Nil(resp)
+		asserts.Equal(serializer.CodeInternalSetting, err.(serializer.AppError).Code)
+	}
+
+	// 需要重定向，成功
+	{
+		fs := FileSystem{
+			User: &model.User{},
+		}
+		fs.FileTarget = []model.File{
+			{
+				SourceName: "tests/file1.txt",
+				PolicyID:   1,
+				Policy: model.Policy{
+					Model: gorm.Model{ID: 1},
+					Type:  "remote",
+				},
+			},
+		}
+		asserts.NoError(cache.Set("setting_preview_timeout", "233", 0))
+		resp, err := fs.Preview(ctx, "/1.txt")
+		asserts.NoError(err)
+		asserts.NotNil(resp)
+		asserts.True(resp.Redirect)
+	}
+}