Use stretchr/testify/assert on onsi/ginkgo without onsi/gomega.

books_suite_test.go

package books_test

import (
	. "github.com/onsi/ginkgo"
	//. "github.com/onsi/gomega"
	ta "github.com/stretchr/testify/assert"

	"testing"
)

var assert = ta.New(GinkgoT())

func TestBooks(t *testing.T) {
	//RegisterFailHandler(Fail)
	RunSpecs(t, "App Suite")
}

books_test.go

package books_test

import (
	//. "UNKNOWN_PACKAGE_PATH"

	. "github.com/onsi/ginkgo"
	//. "github.com/onsi/gomega"
)

type Book struct {
	Title  string
	Author string
	Pages  int
}

var _ = Describe("Book", func() {
	var (
		longBook  Book
		shortBook Book
	)

	BeforeEach(func() {
		longBook = Book{
			Title:  "Les Miserables",
			Author: "Victor Hugo",
			Pages:  1488,
		}

		shortBook = Book{
			Title:  "Fox In Socks",
			Author: "Dr. Seuss",
			Pages:  24,
		}
	})

	Describe("Categorizing book length", func() {
		Context("With more than 300 pages", func() {
			It("should be a novel", func() {
				// Success
				assert.Equal(longBook.Pages, 1488)
				//Expect(longBook.CategoryByLength()).To(Equal("NOVEL"))
			})
		})

		Context("With fewer than 300 pages", func() {
			It("should be a short story", func() {
				// Fail
				assert.Equal(shortBook.Pages, 1488)
				//Expect(shortBook.CategoryByLength()).To(Equal("SHORT STORY"))
			})
		})
	})
})