324 lines
8.5 KiB
Markdown
324 lines
8.5 KiB
Markdown
# Go Test Fixtures
|
|
|
|
[](https://github.com/go-testfixtures/testfixtures/blob/master/LICENSE)
|
|
[](https://gitter.im/go-testfixtures/testfixtures?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
|
[](https://godoc.org/gopkg.in/testfixtures.v1)
|
|
[](https://travis-ci.org/go-testfixtures/testfixtures)
|
|
[](https://goreportcard.com/report/github.com/go-testfixtures/testfixtures)
|
|
|
|
> ***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 to being catch 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: This post is awesome!
|
|
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: Are you kidding me?
|
|
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
|
|
|
|
# ...
|
|
```
|
|
|
|
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
|
|
c, 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
|
|
|
|
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{}
|
|
```
|
|
|
|
## 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/LICENSE)
|
|
|
|
## 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
|
|
|
|
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
|