diff --git a/models/download.go b/models/download.go
index 4cd1597..72d69b7 100644
--- a/models/download.go
+++ b/models/download.go
@@ -74,7 +74,7 @@ func GetDownloadsByStatus(status ...int) []Download {
 // GetDownloadByGid 根据GID和用户ID查找下载
 func GetDownloadByGid(gid string, uid uint) (*Download, error) {
 	download := &Download{}
-	result := DB.Where("user_id = ? and g_id = ?", uid, gid).Find(download)
+	result := DB.Where("user_id = ? and g_id = ?", uid, gid).First(download)
 	return download, result.Error
 }
 
diff --git a/models/download_test.go b/models/download_test.go
new file mode 100644
index 0000000..f0a43b1
--- /dev/null
+++ b/models/download_test.go
@@ -0,0 +1,142 @@
+package model
+
+import (
+	"errors"
+	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/jinzhu/gorm"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestDownload_Create(t *testing.T) {
+	asserts := assert.New(t)
+
+	// 成功
+	{
+		mock.ExpectBegin()
+		mock.ExpectExec("INSERT(.+)").WillReturnResult(sqlmock.NewResult(1, 1))
+		mock.ExpectCommit()
+		download := Download{GID: "1"}
+		id, err := download.Create()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.NoError(err)
+		asserts.EqualValues(1, id)
+	}
+
+	// 失败
+	{
+		mock.ExpectBegin()
+		mock.ExpectExec("INSERT(.+)").WillReturnError(errors.New("error"))
+		mock.ExpectRollback()
+		download := Download{GID: "1"}
+		id, err := download.Create()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.Error(err)
+		asserts.EqualValues(0, id)
+	}
+}
+
+func TestDownload_AfterFind(t *testing.T) {
+	asserts := assert.New(t)
+
+	// 成功
+	{
+		download := Download{Attrs: `{"gid":"123"}`}
+		err := download.AfterFind()
+		asserts.NoError(err)
+		asserts.Equal("123", download.StatusInfo.Gid)
+	}
+
+	// 忽略空值
+	{
+		download := Download{Attrs: ``}
+		err := download.AfterFind()
+		asserts.NoError(err)
+		asserts.Equal("", download.StatusInfo.Gid)
+	}
+
+	// 解析失败
+	{
+		download := Download{Attrs: `?`}
+		err := download.BeforeSave()
+		asserts.Error(err)
+		asserts.Equal("", download.StatusInfo.Gid)
+	}
+}
+
+func TestDownload_Save(t *testing.T) {
+	asserts := assert.New(t)
+
+	// 成功
+	{
+		mock.ExpectBegin()
+		mock.ExpectExec("UPDATE(.+)").WillReturnResult(sqlmock.NewResult(1, 1))
+		mock.ExpectCommit()
+		download := Download{
+			Model: gorm.Model{
+				ID: 1,
+			},
+			Attrs: `{"gid":"123"}`,
+		}
+		err := download.Save()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.NoError(err)
+		asserts.Equal("123", download.StatusInfo.Gid)
+	}
+
+	// 失败
+	{
+		mock.ExpectBegin()
+		mock.ExpectExec("UPDATE(.+)").WillReturnError(errors.New("error"))
+		mock.ExpectRollback()
+		download := Download{
+			Model: gorm.Model{
+				ID: 1,
+			},
+		}
+		err := download.Save()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.Error(err)
+	}
+}
+
+func TestGetDownloadsByStatus(t *testing.T) {
+	asserts := assert.New(t)
+
+	mock.ExpectQuery("SELECT(.+)").WithArgs(0, 1).WillReturnRows(sqlmock.NewRows([]string{"gid"}).AddRow("0").AddRow("1"))
+	res := GetDownloadsByStatus(0, 1)
+	asserts.NoError(mock.ExpectationsWereMet())
+	asserts.Len(res, 2)
+}
+
+func TestGetDownloadByGid(t *testing.T) {
+	asserts := assert.New(t)
+
+	mock.ExpectQuery("SELECT(.+)").WithArgs(2, "gid").WillReturnRows(sqlmock.NewRows([]string{"g_id"}).AddRow("1"))
+	res, err := GetDownloadByGid("gid", 2)
+	asserts.NoError(mock.ExpectationsWereMet())
+	asserts.NoError(err)
+	asserts.Equal(res.GID, "1")
+}
+
+func TestDownload_GetOwner(t *testing.T) {
+	asserts := assert.New(t)
+
+	// 已经有User对象
+	{
+		download := &Download{User: &User{Nick: "nick"}}
+		user := download.GetOwner()
+		asserts.NotNil(user)
+		asserts.Equal("nick", user.Nick)
+	}
+
+	// 无User对象
+	{
+		download := &Download{UserID: 3}
+		mock.ExpectQuery("SELECT(.+)").WillReturnRows(sqlmock.NewRows([]string{"nick"}).AddRow("nick"))
+		user := download.GetOwner()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.NotNil(user)
+		asserts.Equal("nick", user.Nick)
+	}
+}
diff --git a/models/task_test.go b/models/task_test.go
new file mode 100644
index 0000000..9978641
--- /dev/null
+++ b/models/task_test.go
@@ -0,0 +1,72 @@
+package model
+
+import (
+	"errors"
+	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/jinzhu/gorm"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestTask_Create(t *testing.T) {
+	asserts := assert.New(t)
+	// 成功
+	{
+		mock.ExpectBegin()
+		mock.ExpectExec("INSERT(.+)").WillReturnResult(sqlmock.NewResult(1, 1))
+		mock.ExpectCommit()
+		task := Task{Props: "1"}
+		id, err := task.Create()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.NoError(err)
+		asserts.EqualValues(1, id)
+	}
+
+	// 失败
+	{
+		mock.ExpectBegin()
+		mock.ExpectExec("INSERT(.+)").WillReturnError(errors.New("error"))
+		mock.ExpectRollback()
+		task := Task{Props: "1"}
+		id, err := task.Create()
+		asserts.NoError(mock.ExpectationsWereMet())
+		asserts.Error(err)
+		asserts.EqualValues(0, id)
+	}
+}
+
+func TestTask_SetError(t *testing.T) {
+	asserts := assert.New(t)
+	task := Task{
+		Model: gorm.Model{ID: 1},
+	}
+	mock.ExpectBegin()
+	mock.ExpectExec("UPDATE(.+)").WillReturnResult(sqlmock.NewResult(1, 1))
+	mock.ExpectCommit()
+	asserts.NoError(task.SetError("error"))
+	asserts.NoError(mock.ExpectationsWereMet())
+}
+
+func TestTask_SetStatus(t *testing.T) {
+	asserts := assert.New(t)
+	task := Task{
+		Model: gorm.Model{ID: 1},
+	}
+	mock.ExpectBegin()
+	mock.ExpectExec("UPDATE(.+)").WillReturnResult(sqlmock.NewResult(1, 1))
+	mock.ExpectCommit()
+	asserts.NoError(task.SetStatus(1))
+	asserts.NoError(mock.ExpectationsWereMet())
+}
+
+func TestTask_SetProgress(t *testing.T) {
+	asserts := assert.New(t)
+	task := Task{
+		Model: gorm.Model{ID: 1},
+	}
+	mock.ExpectBegin()
+	mock.ExpectExec("UPDATE(.+)").WillReturnResult(sqlmock.NewResult(1, 1))
+	mock.ExpectCommit()
+	asserts.NoError(task.SetProgress(1))
+	asserts.NoError(mock.ExpectationsWereMet())
+}