fix: read CycloneDX BOM components from metadata (#3092)

Signed-off-by: dervoeti <lukas.voetmand@stackable.tech>

cmd/syft/internal/test/integration/sbom_metadata_component_test.go

@@ -0,0 +1,25 @@
+package integration
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/anchore/syft/syft/pkg"
+	"github.com/anchore/syft/syft/source"
+)
+
+func TestSbomMetadataComponent(t *testing.T) {
+	sbom, _ := catalogFixtureImage(t, "image-sbom-metadata-component", source.SquashedScope, "+sbom-cataloger")
+
+	expectedPkgs := []string{"first-subcomponent", "main-component"}
+	foundPkgs := []string{}
+
+	for sbomPkg := range sbom.Artifacts.Packages.Enumerate(pkg.JavaPkg) {
+		foundPkgs = append(foundPkgs, sbomPkg.Name)
+	}
+
+	// check if both the package in `.metadata.component` and the one in `.components` were found
+	if !reflect.DeepEqual(expectedPkgs, foundPkgs) {
+		t.Errorf("expected packages %v, got %v", expectedPkgs, foundPkgs)
+	}
+}