Unit test instability

[cndoit18]

The existing unit tests depend on the order of execution of the goroutine, so it is prone to problems

[drivebyer]

maybe one case: https://ci.bitpoke.io/bitpoke/mysql-operator/319/1/6

• Failure [0.164 seconds]
MySQL user controller when creating the MysqlUser without permissions [It] reconciles the mysql user, but not before the finalizer has been set 
I0831 15:12:59.815629   49398 controller.go:227] controller/mysql-user "msg"="Shutdown signal received, waiting for all workers to finish"  
/workspace/src/github.com/bitpoke/mysql-operator/pkg/controller/mysqluser/mysqluser_controller_test.go:137

  No expected SQLRunner calls left, but got the following call: (dsn root:password@tcp(cluster-698676136-mysql-master.default:3306)/?timeout=5s&multiStatements=true&interpolateParams=true, query BEGIN;
  CREATE USER IF NOT EXISTS ?@? IDENTIFIED BY ?;
  ALTER USER ?@? IDENTIFIED BY ?;
  COMMIT;, args [user-940204931 %!u(MISSING)IZZPhfiISc6xGDaqUQNFp9ksXUA2OIeHsL2nxNIn8ChcoGAkIbotBhEhN8MwbBP user-940204931 %!u(MISSING)IZZPhfiISc6xGDaqUQNFp9ksXUA2OIeHsL2nxNIn8ChcoGAkIbotBhEhN8MwbBP])
  Expected
      <[]fake.SQLCall | len:0, cap:0>: []
  not to be empty

  /workspace/src/github.com/bitpoke/mysql-operator/pkg/internal/mysql/fake/mysql.go:75