Complete push webhooks (#2530)

* implemented missing 'delete' push webhooks

moreover created ActionDeleteBranch and ActionDeleteTag

* add CommitRepoAction tests for tag/branch creation/deletion

* fixed error where push webhook not called if is new branch or tag
removed unnecessary code

* moved prepare unit test environment into separate method to be used across unit tests

* add missing if clause in pushUpdate

Signed-off-by: David Schneiderbauer <dschneiderbauer@gmail.com>

models/unit_tests.go

@@ -5,8 +5,12 @@
 package models
 
 import (
+	"os"
 	"testing"
 
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/Unknwon/com"
 	"github.com/go-xorm/core"
 	"github.com/go-xorm/xorm"
 	"github.com/stretchr/testify/assert"
@@ -38,6 +42,12 @@ func PrepareTestDatabase() error {
 	return LoadFixtures()
 }
 
+func prepareTestEnv(t testing.TB) {
+	assert.NoError(t, PrepareTestDatabase())
+	assert.NoError(t, os.RemoveAll(setting.RepoRootPath))
+	assert.NoError(t, com.CopyDir("../integrations/gitea-repositories-meta", setting.RepoRootPath))
+}
+
 type testCond struct {
 	query interface{}
 	args  []interface{}