Remove integration test in favor of unit test that excerises the same…

… code path

build_test.go

@@ -54,8 +54,7 @@ func testBuild(t *testing.T, context spec.G, it spec.S) {
 		err = os.MkdirAll(filepath.Join(layersDir, "mod-cache"), os.ModePerm)
 		Expect(err).NotTo(HaveOccurred())
 
-		_, err = os.CreateTemp(filepath.Join(layersDir, "mod-cache"), "example")
-		Expect(err).NotTo(HaveOccurred())
+		Expect(os.WriteFile(filepath.Join(filepath.Join(layersDir, "mod-cache"), "cache"), nil, os.ModePerm))
 
 		now := time.Now()
 		clock = chronos.NewClock(func() time.Time {
@@ -177,6 +176,27 @@ func testBuild(t *testing.T, context spec.G, it spec.S) {
 		})
 	})
 
+	context("when the mod cache layer is empty", func() {
+		it.Before(func() {
+			err := os.RemoveAll(filepath.Join(layersDir, "mod-cache", "cache"))
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		it("does not include the module cache layer in the build result", func() {
+			result, err := build(packit.BuildContext{
+				Layers:     packit.Layers{Path: layersDir},
+				WorkingDir: workingDir,
+				BuildpackInfo: packit.BuildpackInfo{
+					Name:    "Some Buildpack",
+					Version: "some-version",
+				},
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			Expect(result.Layers).To(BeEmpty())
+		})
+	})
+
 	context("failure cases", func() {
 		context("build process fails to check if it should run", func() {
 			it.Before(func() {

integration/init_test.go

@@ -82,7 +82,6 @@ func TestIntegration(t *testing.T) {
 
 	suite := spec.New("Integration", spec.Report(report.Terminal{}), spec.Parallel())
 	suite("Default", testDefault)
-	suite("EmptyCache", testEmptyCache)
 	suite("Vendored", testVendored)
 	suite.Run(t)
 }