rebuild_test.go

package integration_test

import (
	"fmt"
	"os"
	"path/filepath"
	"testing"

	"github.com/paketo-buildpacks/occam"
	"github.com/sclevine/spec"

	. "github.com/onsi/gomega"
	. "github.com/paketo-buildpacks/occam/matchers"
)

func testRebuild(t *testing.T, context spec.G, it spec.S) {
	var (
		Expect     = NewWithT(t).Expect
		Eventually = NewWithT(t).Eventually

		pack   occam.Pack
		docker occam.Docker

		imageIDs     map[string]struct{}
		containerIDs map[string]struct{}

		name, source string
	)

	it.Before(func() {
		var err error
		name, err = occam.RandomName()
		Expect(err).NotTo(HaveOccurred())

		pack = occam.NewPack().WithVerbose().WithNoColor()
		docker = occam.NewDocker()

		imageIDs = map[string]struct{}{}
		containerIDs = map[string]struct{}{}
	})

	it.After(func() {
		for id := range containerIDs {
			Expect(docker.Container.Remove.Execute(id)).To(Succeed())
		}

		for id := range imageIDs {
			Expect(docker.Image.Remove.Execute(id)).To(Succeed())
		}

		Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
		Expect(os.RemoveAll(source)).To(Succeed())
	})

	context("when rebuilding an app", func() {
		var firstImage, secondImage occam.Image

		it("builds successfully", func() {
			var err error
			source, err = occam.Source(filepath.Join("testdata", "default"))
			Expect(err).NotTo(HaveOccurred())

			build := pack.Build.
				WithPullPolicy("never").
				WithBuildpacks(
					settings.Buildpacks.GoDist.Online,
					settings.Buildpacks.GoBuild.Online,
				)

			var logs fmt.Stringer
			firstImage, logs, err = build.Execute(name, source)
			Expect(err).ToNot(HaveOccurred(), logs.String)

			imageIDs[firstImage.ID] = struct{}{}

			container, err := docker.Container.Run.
				WithEnv(map[string]string{"PORT": "8080"}).
				WithPublish("8080").
				WithPublishAll().
				Execute(firstImage.ID)
			Expect(err).NotTo(HaveOccurred())

			containerIDs[container.ID] = struct{}{}

			Eventually(container).Should(BeAvailable())

			secondImage, logs, err = build.Execute(name, source)
			Expect(err).ToNot(HaveOccurred(), logs.String)

			imageIDs[secondImage.ID] = struct{}{}

			container, err = docker.Container.Run.
				WithEnv(map[string]string{"PORT": "8080"}).
				WithPublish("8080").
				WithPublishAll().
				Execute(secondImage.ID)
			Expect(err).NotTo(HaveOccurred())

			containerIDs[container.ID] = struct{}{}

			Eventually(container).Should(BeAvailable())

			Expect(secondImage.Buildpacks[1].Layers["targets"].SHA).To(Equal(firstImage.Buildpacks[1].Layers["targets"].SHA))
		})
	})
}