Decouple unit test code from business code (#17623)

integrations/migrate_test.go

@@ -8,6 +8,8 @@ import (
 	"os"
 	"testing"
 
+	"code.gitea.io/gitea/models/unittest"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/migrations"
@@ -17,7 +19,7 @@ import (
 )
 
 func TestMigrateLocalPath(t *testing.T) {
-	assert.NoError(t, db.PrepareTestDatabase())
+	assert.NoError(t, unittest.PrepareTestDatabase())
 
 	adminUser := db.AssertExistsAndLoadBean(t, &models.User{Name: "user1"}).(*models.User)