test: add step in gitHub action from running tests first (#476)

* Add step for running tests in github actions

The test xlsx/xlsx_test.go is removed becout the path containing
file not exist.

* Fix error in test

* test: This test was supposed to test getUsers, but it does nothing

This test will be rewrite for using a clean database, today its
necessary create a syncer manualy for this test pass.

* Add syncer tests

* Fix Copyright position

* fix: back with test file

object/syncer_user_test.go

@@ -1,5 +1,4 @@
 // Copyright 2021 The casbin Authors. All Rights Reserved.
-//
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -11,6 +10,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+// +build !skipCi
 
 package object
 
@@ -21,11 +21,10 @@ import (
 
 func TestGetUsers(t *testing.T) {
 	InitConfig()
-
 	syncers := GetSyncers("admin")
 	syncer := syncers[0]
 	syncer.initAdapter()
-	users := syncer.getOriginalUsers()
+	users, _ := syncer.getOriginalUsers()
 	for _, user := range users {
 		fmt.Printf("%v\n", user)
 	}