Add source bundle validation and inspection

internal/bundle/discover_test.go

@@ -0,0 +1,70 @@
+package bundle
+
+import (
+	"context"
+	"reflect"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/storage"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage/fake"
+)
+
+func TestDiscoverFindsBundlesInDeterministicOrder(t *testing.T) {
+	backend := fake.New()
+	addBundle(t, backend, "z/daily")
+	addBundle(t, backend, "a/daily")
+
+	bundles, err := Discover(context.Background(), backend, "")
+	if err != nil {
+		t.Fatalf("Discover() error = %v", err)
+	}
+	var paths []string
+	for _, sourceBundle := range bundles {
+		paths = append(paths, sourceBundle.RootRelativePath)
+	}
+	want := []string{"a/daily", "z/daily"}
+	if !reflect.DeepEqual(paths, want) {
+		t.Fatalf("paths = %v, want %v", paths, want)
+	}
+}
+
+func TestDiscoverFindsRootBundle(t *testing.T) {
+	backend := validFakeBundle(t)
+	bundles, err := Discover(context.Background(), backend, "")
+	if err != nil {
+		t.Fatalf("Discover() error = %v", err)
+	}
+	if got, want := len(bundles), 1; got != want {
+		t.Fatalf("bundle count = %d, want %d", got, want)
+	}
+	if bundles[0].RootRelativePath != "" {
+		t.Fatalf("root = %q, want empty", bundles[0].RootRelativePath)
+	}
+}
+
+func TestDiscoverRejectsNestedManifests(t *testing.T) {
+	backend := fake.New()
+	addBundle(t, backend, "daily")
+	addBundle(t, backend, "daily/nested")
+
+	_, err := Discover(context.Background(), backend, "")
+	assertErrorContains(t, err, "nested manifest")
+}
+
+func addBundle(t *testing.T, backend *fake.Backend, root string) {
+	t.Helper()
+	writeFakeFile(t, backend, joinTestPath(root, "manifest.json"), string(readFixture(t, "testdata/valid_bundle/manifest.json")))
+	writeFakeFile(t, backend, joinTestPath(root, "report.md"), string(readFixture(t, "testdata/valid_bundle/report.md")))
+	writeFakeFile(t, backend, joinTestPath(root, "summary.txt"), string(readFixture(t, "testdata/valid_bundle/summary.txt")))
+}
+
+func joinTestPath(root, file string) string {
+	if root == "" {
+		return file
+	}
+	joined, err := storage.Join(root, file)
+	if err != nil {
+		panic(err)
+	}
+	return joined
+}