Add go.mod and GH actions

.github/workflows/test.yml

@@ -0,0 +1,33 @@
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - master
+  pull_request:
+name: Test
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.21.x, 1.22.x]
+        platform: [ubuntu-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v4
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout code
+      uses: actions/checkout@v3
+    - uses: actions/cache@v3
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: Get dependencies
+      run: go get ./...
+    - name: Test
+      run: |
+        go test ./...

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015 Koofr
+Copyright (c) 2024 Koofr
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -6,4 +6,12 @@ SafeOnce Go package
 
 ## Install
 
-    go get github.com/koofr/safeonce
+```sh
+go get github.com/koofr/safeonce
+```
+
+## Test
+
+```sh
+go test
+```

example_test.go

@@ -2,10 +2,11 @@ package safeonce_test
 
 import (
 	"fmt"
+
 	"github.com/koofr/safeonce"
 )
 
-func ExampleOnce() {
+func ExampleSafeOnce() {
 	var safeOnce safeonce.SafeOnce
 
 	err := safeOnce.Do(func() error {

go.mod

@@ -0,0 +1,3 @@
+module github.com/koofr/safeonce
+
+go 1.21

safeonce_test.go

@@ -2,8 +2,9 @@ package safeonce_test
 
 import (
 	"fmt"
-	. "github.com/koofr/safeonce"
 	"testing"
+
+	. "github.com/koofr/safeonce"
 )
 
 type one int