cleanup the repository branch

Author: lunny

tests/integration/repo_webhook_test.go

@@ -436,6 +436,10 @@ func Test_WebhookPushDevBranch(t *testing.T) {
 		// 3. trigger the webhook
 		testCreateFile(t, session, "user2", "repo1", "develop", "new_dev_branch", "test_webhook_push.md", "# a test file for webhook push")
 
+		defer func() {
+			// cleanup the new_dev_branch
+			testAPIDeleteBranch(t, "new_dev_branch", http.StatusNoContent)
+		}()
 		afterCommitID, err := gitRepo.GetBranchCommitID("new_dev_branch")
 		assert.NoError(t, err)