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A mock storage implementation for Fiber. This storage is not persistent and is only used for testing purposes.

Note: Requires Go 1.21 and above

Table of Contents



type Storage struct {
// contains filtered or unexported fields

type Entry struct {
Value []byte
Exp time.Time

type Config struct {
CustomFuncs *CustomFuncs

type CustomFuncs struct {
GetFunc func(key string) ([]byte, error)
SetFunc func(key string, val []byte, exp time.Duration) error
DeleteFunc func(key string) error
ResetFunc func() error
CloseFunc func() error
ConnFunc func() map[string]Entry
KeysFunc func() ([][]byte, error)


// New creates a new Storage instance. You can optionally pass a Config.
func New(config ...Config) *Storage

// Get retrieves the value associated with the given key.
func (s *Storage) Get(key string) ([]byte, error)

// Set sets the value for the given key, with an optional expiration duration.
func (s *Storage) Set(key string, val []byte, exp time.Duration) error

// Delete removes the value associated with the given key.
func (s *Storage) Delete(key string) error

// Reset clears all values from the storage.
func (s *Storage) Reset() error

// Close performs any necessary cleanup when the storage is no longer needed.
func (s *Storage) Close() error

// Conn returns a copy of the current state of the storage.
func (s *Storage) Conn() map[string]Entry

// Keys returns a list of all keys in the storage.
func (s *Storage) Keys() ([][]byte, error)

// SetCustomFuncs allows you to set custom functions for the storage operations.
func (s *Storage) SetCustomFuncs(custom *CustomFuncs)


MockStorage is tested on the 2 last Go versions with support for modules. So make sure to initialize one first if you didn't do that yet:

go mod init<user>/<repo>

And then install the mockstorage implementation:

go get


Import the storage package.

import ""

You can use the following possibilities to create a storage:

// Initialize default config
store := mockstorage.New()

// Set a value in the storage.
err := store.Set("key1", []byte("value1"), 0)
if err != nil {
// handle error

// Get a value from the storage.
val, err := store.Get("key1")
if err != nil {
// handle error
fmt.Println(string(val)) // prints "value1"

// Delete a value from the storage.
err = store.Delete("key1")
if err != nil {
// handle error

// Mocking storage operations in tests:
func TestMyFunction(t *testing.T) {
// Create a new instance of MockStorage
store := mockstorage.New()

// Mock the Set function
Set: func(key string, val []byte, exp time.Duration) error {
if key == "expectedKey" && string(val) == "expectedValue" {
return nil
return errors.New("unexpected key or value")

// Call the function you want to test, which should call store.Set
err := MyFunction(store)

// Check that the function behaved as expected
if err != nil {
t.Errorf("MyFunction returned an error: %v", err)

Note: In the mockstorage package, expiration of data is not handled automatically in the background. The data is only marked as expired and removed when you attempt to Get() it after its expiration time. If you're using a custom Get() function or accessing the data directly using the Conn() function, expired data will not be removed. Keep this in mind when writing your tests.


type Config struct {
CustomFuncs *CustomFuncs

Default Config

var ConfigDefault = Config{
CustomFuncs: &CustomFuncs{
GetFunc: nil,
SetFunc: nil,
DeleteFunc: nil,
ResetFunc: nil,
CloseFunc: nil,
ConnFunc: nil,
KeysFunc: nil,