feat: add download count field and unit testing for attachment. (#1512)

* feat: add download count field and unit testing.

* fix: unit testing

* refactor: improve testing.

* fix: update comment

* add default value.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

models/attachment_test.go

@@ -0,0 +1,60 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIncreaseDownloadCount(t *testing.T) {
+	assert.NoError(t, PrepareTestDatabase())
+
+	attachment, err := GetAttachmentByUUID("1234567890")
+	assert.NoError(t, err)
+	assert.Equal(t, int64(0), attachment.DownloadCount)
+
+	// increase download count
+	err = attachment.IncreaseDownloadCount()
+	assert.NoError(t, err)
+
+	attachment, err = GetAttachmentByUUID("1234567890")
+	assert.NoError(t, err)
+	assert.Equal(t, int64(1), attachment.DownloadCount)
+}
+
+func TestGetByCommentOrIssueID(t *testing.T) {
+	assert.NoError(t, PrepareTestDatabase())
+
+	// count of attachments from issue ID
+	attachments, err := GetAttachmentsByIssueID(1)
+	assert.NoError(t, err)
+	assert.Equal(t, 2, len(attachments))
+
+	attachments, err = GetAttachmentsByCommentID(1)
+	assert.NoError(t, err)
+	assert.Equal(t, 2, len(attachments))
+}
+
+func TestDeleteAttachments(t *testing.T) {
+	assert.NoError(t, PrepareTestDatabase())
+
+	count, err := DeleteAttachmentsByIssue(4, false)
+	assert.NoError(t, err)
+	assert.Equal(t, 1, count)
+
+	count, err = DeleteAttachmentsByComment(2, false)
+	assert.NoError(t, err)
+	assert.Equal(t, 2, count)
+
+	err = DeleteAttachment(&Attachment{ID: 8}, false)
+	assert.NoError(t, err)
+
+	attachment, err := GetAttachmentByUUID("test-12345")
+	assert.Error(t, err)
+	assert.True(t, IsErrAttachmentNotExist(err))
+	assert.Nil(t, attachment)
+}