github.com/pingcap/tidb-lightning@v5.0.0-rc.0.20210428090220-84b649866577+incompatible/lightning/verification/checksum_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 verification_test
    15  
    16  import (
    17  	"encoding/json"
    18  	"testing"
    19  
    20  	. "github.com/pingcap/check"
    21  
    22  	"github.com/pingcap/tidb-lightning/lightning/common"
    23  	"github.com/pingcap/tidb-lightning/lightning/verification"
    24  )
    25  
    26  type testKVChcksumSuite struct{}
    27  
    28  func (s *testKVChcksumSuite) SetUpSuite(c *C)    {}
    29  func (s *testKVChcksumSuite) TearDownSuite(c *C) {}
    30  
    31  var _ = Suite(&testKVChcksumSuite{})
    32  
    33  func TestKVChcksum(t *testing.T) {
    34  	TestingT(t)
    35  }
    36  
    37  func uint64NotEqual(a uint64, b uint64) bool { return a != b }
    38  
    39  func (s *testKVChcksumSuite) TestChcksum(c *C) {
    40  	checksum := verification.NewKVChecksum(0)
    41  	c.Assert(checksum.Sum(), Equals, uint64(0))
    42  
    43  	// checksum on nothing
    44  	checksum.Update([]common.KvPair{})
    45  	c.Assert(checksum.Sum(), Equals, uint64(0))
    46  
    47  	checksum.Update(nil)
    48  	c.Assert(checksum.Sum(), Equals, uint64(0))
    49  
    50  	// checksum on real data
    51  	excpectChecksum := uint64(4850203904608948940)
    52  
    53  	kvs := []common.KvPair{
    54  		{
    55  			Key: []byte("Cop"),
    56  			Val: []byte("PingCAP"),
    57  		},
    58  		{
    59  			Key: []byte("Introduction"),
    60  			Val: []byte("Inspired by Google Spanner/F1, PingCAP develops TiDB."),
    61  		},
    62  	}
    63  
    64  	checksum.Update(kvs)
    65  
    66  	var kvBytes uint64
    67  	for _, kv := range kvs {
    68  		kvBytes += uint64(len(kv.Key) + len(kv.Val))
    69  	}
    70  	c.Assert(checksum.SumSize(), Equals, kvBytes)
    71  	c.Assert(checksum.SumKVS(), Equals, uint64(len(kvs)))
    72  	c.Assert(checksum.Sum(), Equals, excpectChecksum)
    73  
    74  	// recompute on same key-value
    75  	checksum.Update(kvs)
    76  	c.Assert(checksum.SumSize(), Equals, kvBytes<<1)
    77  	c.Assert(checksum.SumKVS(), Equals, uint64(len(kvs))<<1)
    78  	c.Assert(uint64NotEqual(checksum.Sum(), excpectChecksum), IsTrue)
    79  }
    80  
    81  func (s *testKVChcksumSuite) TestChecksumJSON(c *C) {
    82  	testStruct := &struct {
    83  		Checksum verification.KVChecksum
    84  	}{
    85  		Checksum: verification.MakeKVChecksum(123, 456, 7890),
    86  	}
    87  
    88  	res, err := json.Marshal(testStruct)
    89  
    90  	c.Assert(err, IsNil)
    91  	c.Assert(res, BytesEquals, []byte(`{"Checksum":{"checksum":7890,"size":123,"kvs":456}}`))
    92  }