github.com/pingcap/br@v5.3.0-alpha.0.20220125034240-ec59c7b6ce30+incompatible/pkg/lightning/common/once_error_test.go (about)

     1  // Copyright 2019 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package common_test
    15  
    16  import (
    17  	"errors"
    18  	"testing"
    19  
    20  	. "github.com/pingcap/check"
    21  
    22  	"github.com/pingcap/br/pkg/lightning/common"
    23  )
    24  
    25  func TestCommon(t *testing.T) {
    26  	TestingT(t)
    27  }
    28  
    29  var _ = Suite(&onceErrorSuite{})
    30  
    31  type onceErrorSuite struct{}
    32  
    33  func (s *onceErrorSuite) TestOnceError(c *C) {
    34  	var err common.OnceError
    35  
    36  	c.Assert(err.Get(), IsNil)
    37  
    38  	err.Set(nil)
    39  	c.Assert(err.Get(), IsNil)
    40  
    41  	e := errors.New("1")
    42  	err.Set(e)
    43  	c.Assert(err.Get(), Equals, e)
    44  
    45  	e2 := errors.New("2")
    46  	err.Set(e2)
    47  	c.Assert(err.Get(), Equals, e) // e, not e2.
    48  
    49  	err.Set(nil)
    50  	c.Assert(err.Get(), Equals, e)
    51  
    52  	ch := make(chan struct{})
    53  	go func() {
    54  		err.Set(nil)
    55  		ch <- struct{}{}
    56  	}()
    57  	<-ch
    58  	c.Assert(err.Get(), Equals, e)
    59  }