Transcription of Ginkgo example with subtests

gingko_subtests_test.go

package gingko_subtests_test
import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestCheckingBooksOutOfLibrary(t *testing.T) {
	t.Run("when the library has the book in question", func(t *t.Testing) {
		t.Run("if the book is available, it lends it to the reader", func(t *t.Testing) {
			assert.Nil(t, valjean.Checkout(ctx, library, "Les Miserables"))
			assert.Contains(t, valjean.Books(), book)
			assert.Equal(t, library.UserWithBook(ctx, book), valjean)
		})

		t.Run("if the book has already been checked out, it tells the user", func(t *t.Testing) {
			err := valjean.Checkout(ctx, library, "Les Miserables")
			assert.Error(t, err)
			assert.Equal(t, "Les Miserables is currently checked out", err)
		})

		t.Run("if the book has already been checked out, lets the user place a hold and get notified later", func(t *t.Testing) {
			assert.Nil(t, valjean.Hold(ctx, library, "Les Miserables"))
			assert.Contains(t, valjean.Holds(ctx), book)

			// when Javert returns the book
			assert.Nil(javert.Return(ctx, library, book))

			// it eventually informs Valjean
			notification := "Les Miserables is ready for pick up"
			assert.Eventually(t, assert.Contains(t, valjean.Notifications, notification))

			assert.Nil(t, valjean.Checkout(ctx, library, "Les Miserables"))
			assert.Contains(t, valjean.Books(), book)
			assert.Empty(valjean.Holds(ctx))
		})
	})

	t.Run("when the library does not have the book in question", func(t *t.Testing) {
		t.Run("it tells the reader the book is unavailable", func(t *t.Testing) {
			err := valjean.Checkout(ctx, library, "Les Miserables")
			assert.Error(t, err)
			assert.Equal(t, "Les Miserables is not in the library catalog", err)
		})
	})
}