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Suite

Standard Test Go Reference

Suite is a package meant to make testing gobuffalo.io applications easier.

Setup

This is the entry point into your unit testing suite. The Test_ActionSuite(t *testing.T) function is compatible with the go test command, and it should:

  • Create and configure your new test suite instance (ActionSuite in this case)
  • Call suite.Run with the *testing.T passed by the Go testing system, and your new ActionSuite instance
package actions_test

import (
    "testing"

    "github.com/gobuffalo/suite/v4"
    "github.com/gobuffalo/toodo/actions"
)

type ActionSuite struct {
    *suite.Action
}

func Test_ActionSuite(t *testing.T) {
    as := &ActionSuite{suite.NewAction(actions.App())}
    suite.Run(t, as)
}

Usage

This is where you write your actual test logic. The rules for test names are similar, but not the same, as with go test:

  • Each test is a method on your *ActionSuite
  • Test method names should start with Test (note the upper case T)
  • Test methods should have no arguments

A few additional notes:

  • To avoid race conditions on the testing database, always use the ActionSuite variable called DB to access the database (not your production app's database)
  • You can access the raw *testing.T value if needed with as.T()
  • ActionSuite has support for testify's require package and assert package
  • ... So try to use one of those instead packages of using the raw methods on the *testing.T
  • The default database that suite will connect to is called testing in your database.yml
package actions_test

import (
    "fmt"

    "github.com/gobuffalo/toodo/models"
)

func (as *ActionSuite) Test_TodosResource_List() {
    todos := models.Todos{
        {Title: "buy milk"},
        {Title: "read a good book"},
    }
    for _, t := range todos {
        err := as.DB.Create(&t)
        as.NoError(err)
    }

    res := as.HTML("/todos").Get()
    body := res.Body.String()
    for _, t := range todos {
        as.Contains(body, fmt.Sprintf("<h2>%s</h2>", t.Title))
    }
}

func (as *ActionSuite) Test_TodosResource_New() {
    res := as.HTML("/todos/new").Get()
    as.Contains(res.Body.String(), "<h1>New Todo</h1>")
}

func (as *ActionSuite) Test_TodosResource_Create() {
    todo := &models.Todo{Title: "Learn Go"}
    res := as.HTML("/todos").Post(todo)
    as.Equal(301, res.Code)
    as.Equal("/todos", res.Location())

    err := as.DB.First(todo)
    as.NoError(err)
    as.NotZero(todo.ID)
    as.NotZero(todo.CreatedAt)
    as.Equal("Learn Go", todo.Title)
}

func (as *ActionSuite) Test_TodosResource_Create_Errors() {
    todo := &models.Todo{}
    res := as.HTML("/todos").Post(todo)
    as.Equal(422, res.Code)
    as.Contains(res.Body.String(), "Title can not be blank.")

    c, err := as.DB.Count(todo)
    as.NoError(err)
    as.Equal(0, c)
}

func (as *ActionSuite) Test_TodosResource_Update() {
    todo := &models.Todo{Title: "Lern Go"}
    verrs, err := as.DB.ValidateAndCreate(todo)
    as.NoError(err)
    as.False(verrs.HasAny())

    res := as.HTML("/todos/%s", todo.ID).Put(&models.Todo{ID: todo.ID, Title: "Learn Go"})
    as.Equal(200, res.Code)

    err = as.DB.Reload(todo)
    as.NoError(err)
    as.Equal("Learn Go", todo.Title)
}

Fixtures (Test Data)

Often it is useful to load a series of data into the database at the start of the test to make testing easier. For example, you need to have a user in the database to log a person into the application, or you need some data in the database to test destroying that data. Fixtures let us solve these problems easily.

Using Fixtures

First you need to setup your test suite to use fixtures. You can do this by using suite.NewActionWithFixtures or suite.NewModelWithFixtures methods to create new test suites that take an fs.FS pointing to where the files for this suite live.

package actions

import (
    "os"
    "testing"

    "github.com/gobuffalo/suite/v4"
)

type ActionSuite struct {
    *suite.Action
}

func Test_ActionSuite(t *testing.T) {
    action, err := suite.NewActionWithFixtures(App(), os.DirFS("../fixtures"))
    if err != nil {
        t.Fatal(err)
    }

    as := &ActionSuite{
        Action: action,
    }
    suite.Run(t, as)
}

Once your suite is set up, you can create N numbers of *.toml files in the directory you've chosen for your fixtures, in this example, ../fixtures.

Example Fixture File

[[scenario]]
name = "lots of widgets"

  [[scenario.table]]
    name = "widgets"

    [[scenario.table.row]]
      id = "<%= uuidNamed("widget") %>"
      name = "This is widget #1"
      body = "some widget body"
      created_at = "<%= now() %>"
      updated_at = "<%= now() %>"

    [[scenario.table.row]]
      id = "<%= uuid() %>"
      name = "This is widget #2"
      body = "some widget body"
      created_at = "<%= now() %>"
      updated_at = "<%= now() %>"

  [[scenario.table]]
    name = "users"

    [[scenario.table.row]]
      id = "<%= uuid() %>"
      name = "Mark Bates"
      admin = true
      price = 19.99
      widget_id = "<%= uuidNamed("widget") %>"
      created_at = "<%= now() %>"
      updated_at = "<%= now() %>"

Helper Methods

The *.toml files all get run through https://github.com/gobuffalo/plush before they're decoded, so you can make use of the helpful helper methods that ship with Plush.

We've also add a couple of useful helpers for you as well:

  • uuid() - returns a new github.com/gobuffalo/uuid.UUID
  • now() - returns time.Now()
  • nowAdd(s) and nowSub(s) - similar to now() but s amount of seconds is added or substracted, respectively, from the return value
  • uuidNamed(name) - will attempt to return a previously declared UUID with that name, useful, for relations/associations. If there was one that wasn't defined with that name, a new one will be created.
  • hash(string, opts) - will create the hashed value of the string (useful for creating a password), you can define the cost as an opts (the default is bcrypt.DefaultCost)

Using in Tests

In your suite tests you need to call the LoadFixture method giving it the name of the fixtures you would like to use for this test.

func (as *ActionSuite) Test_WidgetsResource_List() {
    as.LoadFixture("lots of widgets")
    res := as.HTML("/widgets").Get()

    body := res.Body.String()
    as.Contains(body, "widget #1")
    as.Contains(body, "widget #2")
}

FAQs

  • Can I call LoadFixture more than once in a test? - Absolutely! Call it as many times as you want!
  • Can I load multiple rows into a table in one scenario? - Absolutely!
  • Can I load data into multiple tables in one scenario? - Absolutely!
  • Will it load all my fixtures? - No, you have to load specific scenarios, so don't be afraid to create lots of scenarios and only call the ones you need per test.
  • Will this pollute my database, and how do I clear data between tests? - No need to worry, the suite will truncate any data in your database between test runs, so you never have to worry about it.