github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/hash/position_inertia_test.go (about)

     1  // Copyright 2020 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 hash
    15  
    16  import (
    17  	"testing"
    18  
    19  	"github.com/stretchr/testify/require"
    20  )
    21  
    22  func TestPositionInertia(t *testing.T) {
    23  	t.Parallel()
    24  
    25  	hash := NewPositionInertia()
    26  	hash.Write([]byte("hello"), []byte("hash"))
    27  	hash.Write([]byte("hello"), []byte("pingcap"))
    28  	hash.Write([]byte("hello"), []byte("ticdc"))
    29  	hash.Write([]byte("hello"), []byte("tools"))
    30  	require.Equal(t, uint32(0x914505a7), hash.Sum32())
    31  
    32  	hash.Reset()
    33  	hash.Write([]byte("hello"), []byte("pingcap"))
    34  	hash.Write([]byte("hello"), []byte("hash"))
    35  	hash.Write([]byte("hello"), []byte("tools"))
    36  	hash.Write([]byte("hello"), []byte("ticdc"))
    37  	require.Equal(t, uint32(0x914505a7), hash.Sum32())
    38  
    39  	hash.Reset()
    40  	hash.Write([]byte("hello"), []byte("ticdc"))
    41  	hash.Write([]byte("hello"), []byte("hash"))
    42  	hash.Write([]byte("hello"), []byte("tools"))
    43  	hash.Write([]byte("hello"), []byte("pingcap"))
    44  	require.Equal(t, uint32(0x914505a7), hash.Sum32())
    45  
    46  	hash.Reset()
    47  	hash.Write([]byte("ticdc"), []byte("hello"))
    48  	hash.Write([]byte("hello"), []byte("hash"))
    49  	hash.Write([]byte("hello"), []byte("tools"))
    50  	hash.Write([]byte("hello"), []byte("pingcap"))
    51  	require.Equal(t, uint32(0xf21b4f40), hash.Sum32())
    52  
    53  	hash.Reset()
    54  	hash.Write([]byte("ticdc"), []byte("hello"))
    55  	hash.Write([]byte("hello"), []byte("hash"))
    56  	hash.Write([]byte("tools"), []byte("hello"))
    57  	hash.Write([]byte("hello"), []byte("pingcap"))
    58  	require.Equal(t, uint32(0x7cd6194a), hash.Sum32())
    59  }