101 lines
3.3 KiB
Go
101 lines
3.3 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package memorydb
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import (
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"bytes"
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"testing"
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)
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// Tests that key-value iteration on top of a memory database works.
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func TestMemoryDBIterator(t *testing.T) {
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tests := []struct {
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content map[string]string
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prefix string
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order []string
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}{
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// Empty databases should be iterable
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{map[string]string{}, "", nil},
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{map[string]string{}, "non-existent-prefix", nil},
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// Single-item databases should be iterable
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{map[string]string{"key": "val"}, "", []string{"key"}},
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{map[string]string{"key": "val"}, "k", []string{"key"}},
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{map[string]string{"key": "val"}, "l", nil},
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// Multi-item databases should be fully iterable
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{
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map[string]string{"k1": "v1", "k5": "v5", "k2": "v2", "k4": "v4", "k3": "v3"},
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"",
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[]string{"k1", "k2", "k3", "k4", "k5"},
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},
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{
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map[string]string{"k1": "v1", "k5": "v5", "k2": "v2", "k4": "v4", "k3": "v3"},
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"k",
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[]string{"k1", "k2", "k3", "k4", "k5"},
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},
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{
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map[string]string{"k1": "v1", "k5": "v5", "k2": "v2", "k4": "v4", "k3": "v3"},
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"l",
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nil,
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},
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// Multi-item databases should be prefix-iterable
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{
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map[string]string{
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"ka1": "va1", "ka5": "va5", "ka2": "va2", "ka4": "va4", "ka3": "va3",
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"kb1": "vb1", "kb5": "vb5", "kb2": "vb2", "kb4": "vb4", "kb3": "vb3",
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},
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"ka",
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[]string{"ka1", "ka2", "ka3", "ka4", "ka5"},
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},
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{
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map[string]string{
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"ka1": "va1", "ka5": "va5", "ka2": "va2", "ka4": "va4", "ka3": "va3",
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"kb1": "vb1", "kb5": "vb5", "kb2": "vb2", "kb4": "vb4", "kb3": "vb3",
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},
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"kc",
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nil,
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},
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}
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for i, tt := range tests {
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// Create the key-value data store
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db := New()
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for key, val := range tt.content {
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if err := db.Put([]byte(key), []byte(val)); err != nil {
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t.Fatalf("test %d: failed to insert item %s:%s into database: %v", i, key, val, err)
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}
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}
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// Iterate over the database with the given configs and verify the results
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it, idx := db.NewIteratorWithPrefix([]byte(tt.prefix)), 0
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for it.Next() {
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if !bytes.Equal(it.Key(), []byte(tt.order[idx])) {
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t.Errorf("test %d: item %d: key mismatch: have %s, want %s", i, idx, string(it.Key()), tt.order[idx])
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}
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if !bytes.Equal(it.Value(), []byte(tt.content[tt.order[idx]])) {
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t.Errorf("test %d: item %d: value mismatch: have %s, want %s", i, idx, string(it.Value()), tt.content[tt.order[idx]])
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}
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idx++
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}
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if err := it.Error(); err != nil {
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t.Errorf("test %d: iteration failed: %v", i, err)
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}
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if idx != len(tt.order) {
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t.Errorf("test %d: iteration terminated prematurely: have %d, want %d", i, idx, len(tt.order))
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}
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}
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}
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