foundation/README.md

Foundation

A set of helpers to help to create and manage database migration tests.

Install

go get git.ctrlz.es/mgdelacroix/foundation

Usage

To start using foundation, you need to implement the Migrator interface, describing how your tool manages migrations and what are the intermediate steps (generally data migrations), if any, that need to run at the end of each migration step:

type Migrator interface {
	DB() *sql.DB
	DriverName() string
	Setup() error
	MigrateToStep(step int) error
	TearDown() error
}

interceptors := map[int]Interceptor{
    // function that will run after step 6
    6: func() err {
        return myStore.RunDataMigration()
    },
}

With the interface implemented, you can use foundation in your tests to load fixtures, set the database on a specific state and then run your assertions:

t.Run("migration should link book 1 with its author", func(t *testing.T) {
	f := foundation.New(t, migrator).
		RegisterInterceptors(interceptors).
		// runs migrations up to and including 5
		MigrateToStep(5).
		// loads the SQL of the file
		ExecFile("./myfixtures.sql").
		// runs migration 6 and its interceptor function
		MigrateToStep(6)
	defer f.TearDown()

	book := struct{
		ID int
		AuthorID int
	}{}

	err = f.DB().Get(&book, "SELECT id, authorID FROM books")
	require.NoError(t, err)
	require.Equal(t, 1, book.ID)
	require.Equal(t, 3, book.AuthorID)
})