func (manager *impl) RemoveCheckpoint(checkpointKey string) error {
	manager.mutex.Lock()
	defer manager.mutex.Unlock()
	return manager.store.Delete(checkpointKey)
}

// ListCheckpoints returns the list of existing checkpoints.
func (manager *impl) ListCheckpoints() ([]string, error) {
	manager.mutex.Lock()
	defer manager.mutex.Unlock()
	keys, err := manager.store.List()
	if err != nil {

	assert.NoError(t, err)
	testStore.Write("key1", blob)
	err = manager.GetCheckpoint("key1", checkpoint1)
	assert.EqualError(t, err, "checkpoint is corrupted")

	// Test ListCheckpoints
	keys, err := manager.ListCheckpoints()
	assert.NoError(t, err)
	sort.Strings(keys)
	assert.Equal(t, keys, []string{"key1", "key2"})

	// Test RemoveCheckpoints
	err = manager.RemoveCheckpoint("key1")