github.com/nutsdb/nutsdb@v1.0.4/iterator_test.go (about)

     1  // Copyright 2022 The nutsdb Author. All rights reserved.
     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  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package nutsdb
    16  
    17  import (
    18  	"github.com/stretchr/testify/require"
    19  	"testing"
    20  )
    21  
    22  func TestIterator(t *testing.T) {
    23  	bucket := "bucket"
    24  
    25  	runNutsDBTest(t, nil, func(t *testing.T, db *DB) {
    26  		txCreateBucket(t, db, DataStructureBTree, bucket, nil)
    27  
    28  		for i := 0; i < 100; i++ {
    29  			txPut(t, db, bucket, GetTestBytes(i), GetTestBytes(i), Persistent, nil, nil)
    30  		}
    31  
    32  		_ = db.View(func(tx *Tx) error {
    33  			iterator := NewIterator(tx, bucket, IteratorOptions{Reverse: false})
    34  
    35  			i := 0
    36  
    37  			for {
    38  				value, err := iterator.Value()
    39  				require.NoError(t, err)
    40  				require.Equal(t, GetTestBytes(i), value)
    41  				if !iterator.Next() {
    42  					break
    43  				}
    44  				i++
    45  			}
    46  
    47  			return nil
    48  		})
    49  	})
    50  }
    51  
    52  func TestIterator_Reverse(t *testing.T) {
    53  	bucket := "bucket"
    54  
    55  	runNutsDBTest(t, nil, func(t *testing.T, db *DB) {
    56  		txCreateBucket(t, db, DataStructureBTree, bucket, nil)
    57  
    58  		for i := 0; i < 100; i++ {
    59  			txPut(t, db, bucket, GetTestBytes(i), GetTestBytes(i), Persistent, nil, nil)
    60  		}
    61  
    62  		_ = db.View(func(tx *Tx) error {
    63  			iterator := NewIterator(tx, bucket, IteratorOptions{Reverse: true})
    64  
    65  			i := 99
    66  			for {
    67  				value, err := iterator.Value()
    68  				require.NoError(t, err)
    69  				require.Equal(t, GetTestBytes(i), value)
    70  				if !iterator.Next() {
    71  					break
    72  				}
    73  				i--
    74  			}
    75  
    76  			return nil
    77  		})
    78  	})
    79  }
    80  
    81  func TestIterator_Seek(t *testing.T) {
    82  	bucket := "bucket"
    83  
    84  	runNutsDBTest(t, nil, func(t *testing.T, db *DB) {
    85  		txCreateBucket(t, db, DataStructureBTree, bucket, nil)
    86  
    87  		for i := 0; i < 100; i++ {
    88  			txPut(t, db, bucket, GetTestBytes(i), GetTestBytes(i), Persistent, nil, nil)
    89  		}
    90  
    91  		_ = db.View(func(tx *Tx) error {
    92  			iterator := NewIterator(tx, bucket, IteratorOptions{Reverse: true})
    93  
    94  			iterator.Seek(GetTestBytes(40))
    95  
    96  			value, err := iterator.Value()
    97  			require.NoError(t, err)
    98  			require.Equal(t, GetTestBytes(40), value)
    99  
   100  			return nil
   101  		})
   102  	})
   103  }