syncthing/lib/db/smallindex_test.go

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// Copyright (C) 2018 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package db
import (
"testing"
)
func TestSmallIndex(t *testing.T) {
db := newLowlevelMemory(t)
idx := newSmallIndex(db, []byte{12, 34})
// ID zero should be unallocated
if val, ok := idx.Val(0); ok || val != nil {
t.Fatal("Unexpected return for nonexistent ID 0")
}
// A new key should get ID zero
if id, err := idx.ID([]byte("hello")); err != nil {
t.Fatal(err)
} else if id != 0 {
t.Fatal("Expected 0, not", id)
}
// Looking up ID zero should work
if val, ok := idx.Val(0); !ok || string(val) != "hello" {
t.Fatalf(`Expected true, "hello", not %v, %q`, ok, val)
}
// Delete the key
idx.Delete([]byte("hello"))
// Next ID should be one
if id, err := idx.ID([]byte("key2")); err != nil {
t.Fatal(err)
} else if id != 1 {
t.Fatal("Expected 1, not", id)
}
// Now lets create a new index instance based on what's actually serialized to the database.
idx = newSmallIndex(db, []byte{12, 34})
// Status should be about the same as before.
if val, ok := idx.Val(0); ok || val != nil {
t.Fatal("Unexpected return for deleted ID 0")
}
if id, err := idx.ID([]byte("key2")); err != nil {
t.Fatal(err)
} else if id != 1 {
t.Fatal("Expected 1, not", id)
}
// Setting "hello" again should get us ID 2, not 0 as it was originally.
if id, err := idx.ID([]byte("hello")); err != nil {
t.Fatal(err)
} else if id != 2 {
t.Fatal("Expected 2, not", id)
}
}