Adds test for reproducibility of the builds

integration/init_test.go

@@ -27,7 +27,8 @@ func TestIntegration(t *testing.T) {
 
 	suite := spec.New("Integration", spec.Parallel(), spec.Report(report.Terminal{}))
 	suite("NPM", testNPM)
-	suite("Yarn", testYarn)
 	suite("NodeStart", testNodeStart)
+	suite("ReproducibleBuilds", testReproducibleBuilds)
+	suite("Yarn", testYarn)
 	suite.Run(t)
 }

integration/reproducible_builds_test.go

@@ -0,0 +1,174 @@
+package integration_test
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/paketo-buildpacks/occam"
+	"github.com/sclevine/spec"
+
+	. "github.com/onsi/gomega"
+)
+
+func testReproducibleBuilds(t *testing.T, context spec.G, it spec.S) {
+	var (
+		Expect = NewWithT(t).Expect
+
+		pack   occam.Pack
+		docker occam.Docker
+	)
+
+	it.Before(func() {
+		pack = occam.NewPack()
+		docker = occam.NewDocker()
+	})
+
+	context("when building a node app that does not use a package manager", func() {
+		var (
+			image occam.Image
+
+			name   string
+			source string
+		)
+
+		it.Before(func() {
+			var err error
+			name, err = occam.RandomName()
+			Expect(err).NotTo(HaveOccurred())
+
+			source, err = occam.Source(filepath.Join("testdata", "no_package_manager"))
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		it.After(func() {
+			Expect(docker.Image.Remove.Execute(image.ID)).To(Succeed())
+			Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
+			Expect(os.RemoveAll(source)).To(Succeed())
+		})
+
+		it("creates a two identical images from the same input", func() {
+			var err error
+			var logs fmt.Stringer
+			image, logs, err = pack.WithNoColor().Build.
+				WithBuildpacks(nodeBuildpack).
+				WithPullPolicy("never").
+				Execute(name, source)
+			Expect(err).NotTo(HaveOccurred(), logs.String())
+
+			firstID := image.ID
+
+			// Delete the first image
+			Expect(docker.Image.Remove.Execute(image.ID)).To(Succeed())
+			Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
+
+			image, logs, err = pack.WithNoColor().Build.
+				WithBuildpacks(nodeBuildpack).
+				WithPullPolicy("never").
+				WithClearCache().
+				Execute(name, source)
+			Expect(err).NotTo(HaveOccurred(), logs.String())
+
+			Expect(firstID).To(Equal(image.ID))
+		})
+	})
+
+	context("when building a node app that uses npm", func() {
+		var (
+			image occam.Image
+
+			name   string
+			source string
+		)
+
+		it.Before(func() {
+			var err error
+			name, err = occam.RandomName()
+			Expect(err).NotTo(HaveOccurred())
+
+			source, err = occam.Source(filepath.Join("testdata", "npm"))
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		it.After(func() {
+			Expect(docker.Image.Remove.Execute(image.ID)).To(Succeed())
+			Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
+			Expect(os.RemoveAll(source)).To(Succeed())
+		})
+
+		it("creates a two identical images from the same input", func() {
+			var err error
+			var logs fmt.Stringer
+			image, logs, err = pack.WithNoColor().Build.
+				WithBuildpacks(nodeBuildpack).
+				WithPullPolicy("never").
+				Execute(name, source)
+			Expect(err).NotTo(HaveOccurred(), logs.String())
+
+			firstID := image.ID
+
+			// Delete the first image
+			Expect(docker.Image.Remove.Execute(image.ID)).To(Succeed())
+			Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
+
+			image, logs, err = pack.WithNoColor().Build.
+				WithBuildpacks(nodeBuildpack).
+				WithPullPolicy("never").
+				WithClearCache().
+				Execute(name, source)
+			Expect(err).NotTo(HaveOccurred(), logs.String())
+
+			Expect(firstID).To(Equal(image.ID))
+		})
+	})
+
+	context("when building a node app that uses yarn", func() {
+		var (
+			image occam.Image
+
+			name   string
+			source string
+		)
+
+		it.Before(func() {
+			var err error
+			name, err = occam.RandomName()
+			Expect(err).NotTo(HaveOccurred())
+
+			source, err = occam.Source(filepath.Join("testdata", "yarn"))
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		it.After(func() {
+			Expect(docker.Image.Remove.Execute(image.ID)).To(Succeed())
+			Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
+			Expect(os.RemoveAll(source)).To(Succeed())
+		})
+
+		it("creates a two identical images from the same input", func() {
+			var err error
+			var logs fmt.Stringer
+			image, logs, err = pack.WithNoColor().Build.
+				WithBuildpacks(nodeBuildpack).
+				WithPullPolicy("never").
+				Execute(name, source)
+			Expect(err).NotTo(HaveOccurred(), logs.String())
+
+			firstID := image.ID
+
+			// Delete the first image
+			Expect(docker.Image.Remove.Execute(image.ID)).To(Succeed())
+			Expect(docker.Volume.Remove.Execute(occam.CacheVolumeNames(name))).To(Succeed())
+
+			image, logs, err = pack.WithNoColor().Build.
+				WithBuildpacks(nodeBuildpack).
+				WithPullPolicy("never").
+				WithClearCache().
+				Execute(name, source)
+			Expect(err).NotTo(HaveOccurred(), logs.String())
+
+			Expect(firstID).To(Equal(image.ID))
+		})
+	})
+}