Add source bundle validation and inspection

internal/bundle/digest_test.go

@@ -0,0 +1,21 @@
+package bundle
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestCanonicalBundleDigestReferenceFixture(t *testing.T) {
+	manifest, err := ParseManifest(readFixture(t, "testdata/valid_bundle/manifest.json"))
+	if err != nil {
+		t.Fatalf("ParseManifest() error = %v", err)
+	}
+	gotPayload := CanonicalFilePayload(manifest.Files)
+	wantPayload := strings.TrimSpace(string(readFixture(t, "testdata/canonical_payload.json")))
+	if gotPayload != wantPayload {
+		t.Fatalf("canonical payload = %q, want %q", gotPayload, wantPayload)
+	}
+	if got, want := BundleDigest(manifest.Files), manifest.Digest; got != want {
+		t.Fatalf("BundleDigest() = %q, want %q", got, want)
+	}
+}