[Synthetics] Add e2e test for synthetics deps in complete variants (#8605)

* Add docker integration test for synthetics deps

Author: emilioalvap

dev-tools/packaging/testing/package_test.go

@@ -415,7 +415,7 @@ func checkDocker(t *testing.T, file string, fipsPackage bool) (string, int64) {
 		return checkEdotCollectorDocker(t, file)
 	}
 
-	p, info, err := readDocker(file)
+	p, info, err := readDocker(file, true)
 	if err != nil {
 		t.Errorf("error reading file %v: %v", file, err)
 		return "", -1
@@ -435,6 +435,10 @@ func checkDocker(t *testing.T, file string, fipsPackage bool) (string, int64) {
 	checkHintsInputsD(t, "hints.inputs.d", hintsInputsDFilePattern, p)
 	checkLicensesPresent(t, "licenses/", p)
 
+	if strings.Contains(file, "-complete") {
+		checkCompleteDocker(t, file)
+	}
+
 	name, err := dockerName(file, info.Config.Labels)
 	if err != nil {
 		t.Errorf("error constructing docker name: %v", err)
@@ -450,7 +454,7 @@ func dockerName(file string, labels map[string]string) (string, error) {
 		return "", errors.New("version label not found")
 	}
 
-	parts := strings.SplitN(file, "/", -1)
+	parts := strings.Split(file, "/")
 	if len(parts) == 0 {
 		return "", errors.New("failed to get file name parts")
 	}
@@ -464,7 +468,7 @@ func dockerName(file string, labels map[string]string) (string, error) {
 }
 
 func checkEdotCollectorDocker(t *testing.T, file string) (string, int64) {
-	p, info, err := readDocker(file)
+	p, info, err := readDocker(file, true)
 	if err != nil {
 		t.Errorf("error reading file %v: %v", file, err)
 		return "", -1
@@ -489,6 +493,15 @@ func checkEdotCollectorDocker(t *testing.T, file string) (string, int64) {
 	return name, info.Size
 }
 
+func checkCompleteDocker(t *testing.T, file string) {
+	p, _, err := readDocker(file, false)
+	if err != nil {
+		t.Errorf("error reading file %v: %v", file, err)
+	}
+
+	checkSyntheticsDeps(t, "usr", p)
+}
+
 // Verify that the main configuration file is installed with a 0600 file mode.
 func checkConfigPermissions(t *testing.T, p *packageFile) {
 	checkFilePermissions(t, p, configFilePattern, expectedConfigMode)
@@ -701,6 +714,23 @@ func checkLicensesPresent(t *testing.T, prefix string, p *packageFile) {
 	}
 }
 
+func checkSyntheticsDeps(t *testing.T, prefix string, p *packageFile) {
+	syntheticsDeps := []string{"node", "npm", "elastic-synthetics", "chrome"}
+	for _, dep := range syntheticsDeps {
+		t.Run("Binary file "+dep, func(t *testing.T) {
+			for _, entry := range p.Contents {
+				if strings.HasPrefix(entry.File, prefix) && strings.HasSuffix(entry.File, "/"+dep) {
+					return
+				}
+			}
+			if prefix != "" {
+				t.Fatalf("%s not found under %s", dep, prefix)
+			}
+			t.Fatal("not found")
+		})
+	}
+}
+
 func checkDockerEntryPoint(t *testing.T, p *packageFile, info *dockerInfo) {
 	expectedMode := os.FileMode(0755)
 
@@ -1038,7 +1068,7 @@ func openZip(zipFile string) (*zip.ReadCloser, error) {
 	return r, nil
 }
 
-func readDocker(dockerFile string) (*packageFile, *dockerInfo, error) {
+func readDocker(dockerFile string, filterWorkingDir bool) (*packageFile, *dockerInfo, error) {
 	// Read the manifest file first so that the config file and layer
 	// names are known in advance.
 	manifest, err := getDockerManifest(dockerFile)
@@ -1111,7 +1141,7 @@ func readDocker(dockerFile string) (*packageFile, *dockerInfo, error) {
 				continue
 			}
 			// Check only files in working dir and entrypoint
-			if strings.HasPrefix("/"+name, workingDir) || "/"+name == entrypoint {
+			if !filterWorkingDir || strings.HasPrefix("/"+name, workingDir) || "/"+name == entrypoint {
 				p.Contents[name] = entry
 			}
 			// Add also licenses