119 lines
3.9 KiB
Markdown
119 lines
3.9 KiB
Markdown
<h1 align="center"><img src="./docs/images/banner_dockertest.png" alt="ORY Dockertest"></h1>
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[](https://travis-ci.org/ory/dockertest?branch=master)
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[](https://coveralls.io/github/ory/dockertest?branch=v3)
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Use Docker to run your Go language integration tests against third party services on **Microsoft Windows, Mac OSX and Linux**!
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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**Table of Contents**
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- [Why should I use Dockertest?](#why-should-i-use-dockertest)
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- [Installing and using Dockertest](#installing-and-using-dockertest)
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- [Using Dockertest](#using-dockertest)
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- [Examples](#examples)
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- [Troubleshoot & FAQ](#troubleshoot-&-faq)
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- [Out of disk space](#out-of-disk-space)
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- [Removing old containers](#removing-old-containers)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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## Why should I use Dockertest?
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When developing applications, it is often necessary to use services that talk to a database system.
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Unit Testing these services can be cumbersome because mocking database/DBAL is strenuous. Making slight changes to the
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schema implies rewriting at least some, if not all of the mocks. The same goes for API changes in the DBAL.
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To avoid this, it is smarter to test these specific services against a real database that is destroyed after testing.
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Docker is the perfect system for running unit tests as you can spin up containers in a few seconds and kill them when
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the test completes. The Dockertest library provides easy to use commands for spinning up Docker containers and using
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them for your tests.
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## Installing and using Dockertest
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Using Dockertest is straightforward and simple. Check the [releases tab](https://github.com/ory/dockertest/releases)
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for available releases.
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To install dockertest, run
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```
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dep ensure -add github.com/ory/dockertest@v3.x.y
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```
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### Using Dockertest
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```go
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package dockertest_test
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import (
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"database/sql"
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"fmt"
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"log"
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"os"
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"testing"
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_ "github.com/go-sql-driver/mysql"
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"github.com/ory/dockertest"
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)
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var db *sql.DB
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func TestMain(m *testing.M) {
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// uses a sensible default on windows (tcp/http) and linux/osx (socket)
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pool, err := dockertest.NewPool("")
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if err != nil {
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log.Fatalf("Could not connect to docker: %s", err)
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}
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// pulls an image, creates a container based on it and runs it
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resource, err := pool.Run("mysql", "5.7", []string{"MYSQL_ROOT_PASSWORD=secret"})
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if err != nil {
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log.Fatalf("Could not start resource: %s", err)
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}
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// exponential backoff-retry, because the application in the container might not be ready to accept connections yet
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if err := pool.Retry(func() error {
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var err error
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db, err = sql.Open("mysql", fmt.Sprintf("root:secret@(localhost:%s)/mysql", resource.GetPort("3306/tcp")))
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if err != nil {
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return err
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}
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return db.Ping()
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}); err != nil {
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log.Fatalf("Could not connect to docker: %s", err)
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}
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code := m.Run()
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// You can't defer this because os.Exit doesn't care for defer
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if err := pool.Purge(resource); err != nil {
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log.Fatalf("Could not purge resource: %s", err)
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}
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os.Exit(code)
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}
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func TestSomething(t *testing.T) {
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// db.Query()
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}
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```
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### Examples
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We provide code examples for well known services in the [examples](examples/) directory, check them out!
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## Troubleshoot & FAQ
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### Out of disk space
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Try cleaning up the images with [docker-cleanup-volumes](https://github.com/chadoe/docker-cleanup-volumes).
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### Removing old containers
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Sometimes container clean up fails. Check out
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[this stackoverflow question](http://stackoverflow.com/questions/21398087/how-to-delete-dockers-images) on how to fix this. You may also set an absolute lifetime on containers:
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```go
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resource.Expire(60) // Tell docker to hard kill the container in 60 seconds
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```
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