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# Go Test Fixtures
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> ***Warning***: this package will wipe the database data before loading the
fixtures! It is supposed to be used on a test database. Please, double check
if you are running it against the correct database.
Writing tests is hard, even more when you have to deal with an SQL database.
This package aims to make writing functional tests for web apps written in
Go easier.
Basically this package mimics the ["Rails' way"][railstests] of writing tests
for database applications, where sample data is kept in fixtures files. Before
the execution of every test, the test database is cleaned and the fixture data
is loaded into the database.
The idea is running tests against a real database, instead of relying in mocks,
which is boring to setup and may lead to production bugs not being caught in
the tests.
## Installation
First, get it:
```bash
go get -u gopkg.in/testfixtures.v2
```
## Usage
Create a folder for the fixture files. Each file should contain data for a
single table and have the name `<table-name>.yml`:
```yml
myapp
- myapp.go
- myapp_test.go
- ...
- fixtures:
- posts.yml
- comments.yml
- tags.yml
- posts_tags.yml
- ...
```
The file would look like this (it can have as many record you want):
```yml
# comments.yml
- id: 1
post_id: 1
content: A comment...
author_name: John Doe
author_email: john@doe.com
created_at: 2016-01-01 12:30:12
updated_at: 2016-01-01 12:30:12
- id: 2
post_id: 2
content: Another comment...
author_name: John Doe
author_email: john@doe.com
created_at: 2016-01-01 12:30:12
updated_at: 2016-01-01 12:30:12
# ...
```
An YAML object or array will be converted to JSON. It can be stored on a native
JSON type like JSONB on PostgreSQL or as a TEXT or VARCHAR column on other
databases.
```yml
- id: 1
post_attributes:
author: John Due
author_email: john@due.com
title: "..."
tags:
- programming
- go
- testing
post: "..."
```
If you need to write raw SQL, probably to call a function, prefix the value
of the column with `RAW=`:
```yml
- id: 1
uuid_column: RAW=uuid_generate_v4()
postgis_type_column: RAW=ST_GeomFromText('params...')
created_at: RAW=NOW()
updated_at: RAW=NOW()
```
Your tests would look like this:
```go
package myapp
import (
"database/sql"
"log"
_ "github.com/lib/pq"
"gopkg.in/testfixtures.v2"
)
var (
db *sql.DB
fixtures *testfixtures.Context
)
func TestMain(m *testing.M) {
var err error
// Open connection with the test database.
// Do NOT import fixtures in a production database!
// Existing data would be deleted
db, err = sql.Open("postgres", "dbname=myapp_test")
if err != nil {
log.Fatal(err)
}
// creating the context that hold the fixtures
// see about all compatible databases in this page below
   fixtures, err = testfixtures.NewFolder(db, &testfixtures.PostgreSQL{}, "testdata/fixtures")
if err != nil {
log.Fatal(err)
}
os.Exit(m.Run())
}
func prepareTestDatabase() {
if err := fixtures.Load(); err != nil {
log.Fatal(err)
}
}
func TestX(t *testing.T) {
prepareTestDatabase()
// your test here ...
}
func TestY(t *testing.T) {
prepareTestDatabase()
// your test here ...
}
func TestZ(t *testing.T) {
prepareTestDatabase()
// your test here ...
}
```
Alternatively, you can use the `NewFiles` function, to specify which
files you want to load into the database:
```go
fixtures, err := testfixtures.NewFiles(db, &testfixtures.PostgreSQL{},
"fixtures/orders.yml",
"fixtures/customers.yml",
// add as many files you want
)
if err != nil {
log.Fatal(err)
}
```
## Security check
In order to prevent you from accidentally wiping the wrong database, this
package will refuse to load fixtures if the database name (or database
filename for SQLite) doesn't contains "test". If you want to disable this
check, use:
```go
testfixtures.SkipDatabaseNameCheck(true)
```
## Sequences
For PostgreSQL or Oracle, this package also resets all sequences to a high
number to prevent duplicated primary keys while running the tests.
The default is 10000, but you can change that with:
```go
testfixtures.ResetSequencesTo(10000)
```
## Compatible databases
### PostgreSQL
This package has two approaches to disable foreign keys while importing fixtures
in PostgreSQL databases:
#### With `DISABLE TRIGGER`
This is the default approach. For that use:
```go
&testfixtures.PostgreSQL{}
```
With the above snippet this package will use `DISABLE TRIGGER` to temporarily
disabling foreign key constraints while loading fixtures. This work with any
version of PostgreSQL, but it is **required** to be connected in the database
as a SUPERUSER. You can make a PostgreSQL user a SUPERUSER with:
```sql
ALTER USER your_user SUPERUSER;
```
#### With `ALTER CONSTRAINT`
This approach don't require to be connected as a SUPERUSER, but only work with
PostgreSQL versions >= 9.4. Try this if you are getting foreign key violation
errors with the previous approach. It is as simple as using:
```go
&testfixtures.PostgreSQL{UseAlterConstraint: true}
```
### MySQL / MariaDB
Just make sure the connection string have
[the multistatement parameter](https://github.com/go-sql-driver/mysql#multistatements)
set to true, and use:
```go
&testfixtures.MySQL{}
```
### SQLite
SQLite is also supported. It is recommended to create foreign keys as
`DEFERRABLE` (the default) to prevent problems. See more
[on the SQLite documentation](https://www.sqlite.org/foreignkeys.html#fk_deferred).
(Foreign key constraints are no-op by default on SQLite, but enabling it is
recommended).
```go
&testfixtures.SQLite{}
```
### Microsoft SQL Server
SQL Server support requires SQL Server >= 2008. Inserting on `IDENTITY` columns
are handled as well. Just make sure you are logged in with a user with
`ALTER TABLE` permission.
```go
&testfixtures.SQLServer{}
```
### Oracle
Oracle is supported as well. Use:
```go
&testfixtures.Oracle{}
```
## Generation fixtures for a existent database (experimental)
The following code will generate a YAML file for each table of the database in
the given folder. It may be useful to boostrap a test scenario from a sample
database of your app.
```go
err := testfixtures.GenerateFixtures(db, &testfixtures.PostgreSQL{}, "testdata/fixtures")
if err != nil {
log.Fatalf("Error generating fixtures: %v", err)
}
```
> This was thought to run in small sample databases. It will likely break
if run in a production/big database.
## Contributing
Tests were written to ensure everything work as expected. You can run the tests
with:
```bash
# running tests for PostgreSQL
go test -tags postgresql
# running test for MySQL
go test -tags mysql
# running tests for SQLite
go test -tags sqlite
# running tests for SQL Server
go test -tags sqlserver
# running tests for Oracle
go test -tags oracle
# running test for multiple databases at once
go test -tags 'sqlite postgresql mysql'
# running tests + benchmark
go test -v -bench=. -tags postgresql
```
Travis runs tests for PostgreSQL, MySQL and SQLite.
To set the connection string of tests for each database, edit the `.env`
file, but do not include the changes a in pull request.
## Changes in v2
A context was created to allow cache of some SQL statements. See in the
documentation above how to use it.
The helpers were renamed to have a smaller name:
```go
PostgreSQLHelper{} -> PostgreSQL{}
MySQLHelper{} -> MySQL{}
SQLiteHelper{} -> SQLite{}
SQLServerHelper{} -> SQLServer{}
OracleHelper{} -> Oracle{}
```
The old functions and helpers are still available for backward compatibility.
See the file [deprecated.go](https://github.com/go-testfixtures/testfixtures/blob/master/deprecated.go)
## Alternatives
If you don't think using fixtures is a good idea, you can try one of these
packages instead:
- [factory-go][factorygo]: Factory for Go. Inspired by Python's Factory Boy
and Ruby's Factory Girl
- [go-txdb (Single transaction SQL driver for Go)][gotxdb]: Use a single
database transaction for each functional test, so you can rollback to
previous state between tests to have the same database state in all tests
- [go-sqlmock][gosqlmock]: A mock for the sql.DB interface. This allow you to
unit test database code without having to connect to a real database
- [dbcleaner][dbcleaner] - Clean database for testing, inspired by
database_cleaner for Ruby
There's also these other implementations of test fixtures for Go:
- [go-fixtures][gofixtures]: Django style fixtures for Go
- [mongofixtures][mongofixtures]: Fixtures for MongoDB
- [fixturer][fixturer]: Another fixture loader supporting MySQL
[railstests]: http://guides.rubyonrails.org/testing.html#the-test-database
[gotxdb]: https://github.com/DATA-DOG/go-txdb
[gosqlmock]: https://github.com/DATA-DOG/go-sqlmock
[gofixtures]: https://github.com/AreaHQ/go-fixtures
[mongofixtures]: https://github.com/OwlyCode/mongofixtures
[fixturer]: https://github.com/44hapa/fixturer
[factorygo]: https://github.com/bluele/factory-go
[dbcleaner]: https://github.com/khaiql/dbcleaner